[gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Joe Peterson]

I am in the process of trying out Gentoo/FreeBSD - I love the idea of
being able to use the very cool portage system on BSD!

Anyway, I have tried the install twice, the second time doing the
"emerge -e system" before the kernel build, but I am getting stuck at
the same issue: I get TCP timeouts to some sites.  This is such a
bummer, and I am asking if anyone knows a solutuon.  I have seen some
other postings to this list that may be the same issue (packet mangling?).

Anyway, as an example, I can never FTP to www.astron.com (where the
"file" package, among other things, lives).  Even if I use wget or lynx
to do an FTP connection, it simply hangs.  I *can* get to this site
using Windows, Linux, and regular FreeBSD (non-Gentoo) from the same
machine and on the same network, so it has to be something to do with
Gentoo/FreeBSD in particular.

If I can find a way past this problem, I have high hopes of setting up a
working desktop, and I'd be glad to contribute in whatever way I can to
the effort.  Is the project active right now?  I have not seen much
activity as of late.  I do wish the best for this project, since I think
it is valuable!

	Thanks!  Joe
-- 
gentoo-bsd@gentoo.org mailing list

Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Ignacio Arqué-Latour]

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Joe
> Is the project active right now?
Yes
> I have high hopes of setting up a working desktop, and I'd be glad to
contribute in whatever way I can to the effort.
OK, that is the attitude!
You are going to find plenty of help from the developers in our irc channel
(inclusive while you are installing),  please meet us on:
channel: #gentoo-bsd
server: irc.freenode.net

I hope to see you soom in the channel ;-)

-- Ignacio

On 4/18/07, Joe Peterson <joe@skyrush.com> wrote:
>
> I am in the process of trying out Gentoo/FreeBSD - I love the idea of
> being able to use the very cool portage system on BSD!
>
> Anyway, I have tried the install twice, the second time doing the
> "emerge -e system" before the kernel build, but I am getting stuck at
> the same issue: I get TCP timeouts to some sites.  This is such a
> bummer, and I am asking if anyone knows a solutuon.  I have seen some
> other postings to this list that may be the same issue (packet mangling?).
>
> Anyway, as an example, I can never FTP to www.astron.com (where the
> "file" package, among other things, lives).  Even if I use wget or lynx
> to do an FTP connection, it simply hangs.  I *can* get to this site
> using Windows, Linux, and regular FreeBSD (non-Gentoo) from the same
> machine and on the same network, so it has to be something to do with
> Gentoo/FreeBSD in particular.
>
> If I can find a way past this problem, I have high hopes of setting up a
> working desktop, and I'd be glad to contribute in whatever way I can to
> the effort.  Is the project active right now?  I have not seen much
> activity as of late.  I do wish the best for this project, since I think
> it is valuable!
>
>         Thanks!  Joe
> --
> gentoo-bsd@gentoo.org mailing list
>
>

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Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Joe Peterson]

Great!  That should be good to visit.  Is there a time of day when
people are more likely to be on?  I may try this evening (I'm in US
mountain time).

	-Thanks, Joe


Ignacio Arqué-Latour wrote:
> Joe
>> Is the project active right now?
> Yes
>> I have high hopes of setting up a working desktop, and I'd be glad to
> contribute in whatever way I can to the effort.
> OK, that is the attitude!
> You are going to find plenty of help from the developers in our irc channel
> (inclusive while you are installing),  please meet us on:
> channel: #gentoo-bsd
> server: irc.freenode.net
> 
> I hope to see you soom in the channel ;-)
> 
> -- Ignacio
> 
> On 4/18/07, Joe Peterson <joe@skyrush.com> wrote:
>> I am in the process of trying out Gentoo/FreeBSD - I love the idea of
>> being able to use the very cool portage system on BSD!
>>
>> Anyway, I have tried the install twice, the second time doing the
>> "emerge -e system" before the kernel build, but I am getting stuck at
>> the same issue: I get TCP timeouts to some sites.  This is such a
>> bummer, and I am asking if anyone knows a solutuon.  I have seen some
>> other postings to this list that may be the same issue (packet mangling?).
>>
>> Anyway, as an example, I can never FTP to www.astron.com (where the
>> "file" package, among other things, lives).  Even if I use wget or lynx
>> to do an FTP connection, it simply hangs.  I *can* get to this site
>> using Windows, Linux, and regular FreeBSD (non-Gentoo) from the same
>> machine and on the same network, so it has to be something to do with
>> Gentoo/FreeBSD in particular.
>>
>> If I can find a way past this problem, I have high hopes of setting up a
>> working desktop, and I'd be glad to contribute in whatever way I can to
>> the effort.  Is the project active right now?  I have not seen much
>> activity as of late.  I do wish the best for this project, since I think
>> it is valuable!
>>
>>         Thanks!  Joe
>> --
>> gentoo-bsd@gentoo.org mailing list
>>
>>
> 
-- 
gentoo-bsd@gentoo.org mailing list

Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Justin Wyer]

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Hi Joe, if you check the list archives you will find a thread about the same
problem. It is essentially a TCP window scaling issue, you can check the
archive for details, I am unsure if a solution was found.

Cheers
Justin

On 4/18/07, Joe Peterson <joe@skyrush.com> wrote:
>
> Great!  That should be good to visit.  Is there a time of day when
> people are more likely to be on?  I may try this evening (I'm in US
> mountain time).
>
>         -Thanks, Joe
>
>
> Ignacio Arqué-Latour wrote:
> > Joe
> >> Is the project active right now?
> > Yes
> >> I have high hopes of setting up a working desktop, and I'd be glad to
> > contribute in whatever way I can to the effort.
> > OK, that is the attitude!
> > You are going to find plenty of help from the developers in our irc
> channel
> > (inclusive while you are installing),  please meet us on:
> > channel: #gentoo-bsd
> > server: irc.freenode.net
> >
> > I hope to see you soom in the channel ;-)
> >
> > -- Ignacio
> >
> > On 4/18/07, Joe Peterson <joe@skyrush.com> wrote:
> >> I am in the process of trying out Gentoo/FreeBSD - I love the idea of
> >> being able to use the very cool portage system on BSD!
> >>
> >> Anyway, I have tried the install twice, the second time doing the
> >> "emerge -e system" before the kernel build, but I am getting stuck at
> >> the same issue: I get TCP timeouts to some sites.  This is such a
> >> bummer, and I am asking if anyone knows a solutuon.  I have seen some
> >> other postings to this list that may be the same issue (packet
> mangling?).
> >>
> >> Anyway, as an example, I can never FTP to www.astron.com (where the
> >> "file" package, among other things, lives).  Even if I use wget or lynx
> >> to do an FTP connection, it simply hangs.  I *can* get to this site
> >> using Windows, Linux, and regular FreeBSD (non-Gentoo) from the same
> >> machine and on the same network, so it has to be something to do with
> >> Gentoo/FreeBSD in particular.
> >>
> >> If I can find a way past this problem, I have high hopes of setting up
> a
> >> working desktop, and I'd be glad to contribute in whatever way I can to
> >> the effort.  Is the project active right now?  I have not seen much
> >> activity as of late.  I do wish the best for this project, since I
> think
> >> it is valuable!
> >>
> >>         Thanks!  Joe
> >> --
> >> gentoo-bsd@gentoo.org mailing list
> >>
> >>
> >
> --
> gentoo-bsd@gentoo.org mailing list
>
>

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Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Joe Peterson]

There are a couple of threads about similar TCP issues, and one did
mention windowing.  I did try turning off rfc1323 windowing per
instructions I saw, but it did not help.  I also noted that Nathan Smith
(post: http://scriptstest.gentoo.org/gentoo-bsd/msg_00121.xml) also said
playing with and turning off windowing did not seem to help.

Nathan went further and captured packets, noting that ones from the
Gentoo/FreeBSD system had bad checksums (they were mangled somehow).
Another common experience is that regular FreeBSD does not have the
problem - it is somehow specific to Gentoo/FreeBSD.  A reliable test
case I found is trying to FTP to ftp.astron.com - never works.

		Thanks, Joe


Justin Wyer wrote:
> Hi Joe, if you check the list archives you will find a thread about the same
> problem. It is essentially a TCP window scaling issue, you can check the
> archive for details, I am unsure if a solution was found.
-- 
gentoo-bsd@gentoo.org mailing list

Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Camille Huot]

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2007/4/19, Joe Peterson <joe@skyrush.com>:
>
> A reliable test
> case I found is trying to FTP to ftp.astron.com - never works.
>

I'm experiencing the exact same problem. tcpdump show bad checksums like
Nathan, ftp ftp.astron.com doesn't work.

My nic is:
em0: <Intel(R) PRO/1000 Network Connection Version - 6.2.9> port
0xcc00-0xcc3f mem 0xdfde0000-0xdfdfffff irq 18 at device 2.0 on pci1
em0: Ethernet address: 00:11:09:35:c3:81

Using a vanilla FreeBSD 6.2 kernel on Gentoo/FreeBSD, networking is
working. On #gentoo-bsd we're trying to find the origin of the issue.
-- 
Camille Huot

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Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Nathan Smith]

On 4/19/07, Camille Huot <cam@gentoo.org> wrote:
> 2007/4/19, Joe Peterson <joe@skyrush.com>:
> > A reliable test
> > case I found is trying to FTP to ftp.astron.com - never works.
> >
>
> I'm experiencing the exact same problem. tcpdump show bad checksums like
> Nathan, ftp ftp.astron.com doesn't work.
>
> My nic is:
> em0: <Intel(R) PRO/1000 Network Connection Version - 6.2.9> port
> 0xcc00-0xcc3f mem 0xdfde0000-0xdfdfffff irq 18 at device 2.0 on pci1
> em0: Ethernet address: 00:11:09:35:c3:81
>
> Using a vanilla FreeBSD 6.2 kernel on Gentoo/FreeBSD, networking is working.
> On #gentoo-bsd we're trying to find the origin
> of the issue.
> --
> Camille Huot

Victory!

Here is how I compiled a Gentoo/FreeBSD kernel which does not produce
broken tcp packets:

1. I emerged =sys-devel/gcc-3*.
2. Used gcc-config to set gcc-3 as the system compiler
3. Edited the freebsd-sources ebuild to remove the gcc41 patch.
4. Emerged freebsd-sources
5. Compiled the kernel and rebooted to find I could make normal TCP
connections to anyone, anywhere.

So gcc-4.1 seems to be the culprit here.  I will check FreeBSD's
archives to see if this has come up, but I wonder if they have moved
to gcc4 yet anyway.  So, give what I posted above a try an let me know
how it worked for you.

-- 
Nathan Smith
ndansmith@gmail.com
-- 
gentoo-bsd@gentoo.org mailing list

Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Timothy Redaelli]

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Nathan Smith ha scritto:
> On 4/19/07, Camille Huot <cam@gentoo.org> wrote:
>> 2007/4/19, Joe Peterson <joe@skyrush.com>:
>> > A reliable test
>> > case I found is trying to FTP to ftp.astron.com - never works.
>> >
>>
>> I'm experiencing the exact same problem. tcpdump show bad checksums like
>> Nathan, ftp ftp.astron.com doesn't work.
>>
>> My nic is:
>> em0: <Intel(R) PRO/1000 Network Connection Version - 6.2.9> port
>> 0xcc00-0xcc3f mem 0xdfde0000-0xdfdfffff irq 18 at device 2.0 on pci1
>> em0: Ethernet address: 00:11:09:35:c3:81
>>
>> Using a vanilla FreeBSD 6.2 kernel on Gentoo/FreeBSD, networking is
>> working.
>> On #gentoo-bsd we're trying to find the origin
>> of the issue.
>> -- 
>> Camille Huot
> 
> Victory!

Can you try to recompile the kernel with gcc 4 but with -O0?
cd /usr/src/sys/i386/compile/GENERIC ; COPTFLAGS=-O0 make

Thanks

-- 
Timothy `Drizzt` Redaelli - http://dev.gentoo.org/~drizzt/
FreeSBIE Developer, Gentoo Developer, GUFI Staff
There are two major products that come out of Berkeley: LSD and UNIX.
We don't believe this to be a coincidence.      -- Jeremy S. Anderson


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Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Nathan Smith]

On 4/20/07, Timothy Redaelli <drizzt@gentoo.org> wrote:
> Can you try to recompile the kernel with gcc 4 but with -O0?
> cd /usr/src/sys/i386/compile/GENERIC ; COPTFLAGS=-O0 make

I can confirm that compiling with gcc-4 and COPTFLAGS=-O0 produces a
working kernel (i.e. no malformed tcp packets).  This was after I
found that the gcc41 patch is also not causing the problem.  After
getting a working kernel with gcc-4 I went back and used the default
COPTFLAGS again and it broke again.  So I think this gives us a fair
amount of certainty that the problem is caused by gcc-4 optimizations.

As to the reason why some FreeBSD users experience this and other do
not, I am not sure.  The symptoms (broken TCP traffic to some sites)
depend entirely upon the sites you are connecting to and how your
connections are routed.  So it is possible that somebody could have
this problem by not realize it.

However, using tcpdump I can tell that some machines apparently do not
experience this problem, so it may be processor-specific (which makes
sense given that it is an optimization problem).  I use a Pentium M.
What are other people using that have been affected by the problem?

-- 
Nathan Smith
ndansmith@gmail.com
-- 
gentoo-bsd@gentoo.org mailing list

Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Joe Peterson]

Nathan, thanks so much for all the effort you've put into this.  I am
quite relieved we now know more about it and that it's no longer a
complete mystery.

As a data point, I have the issue (my "test site" that is unreachable is
ftp.astron.com), and I am on a Fujitsu Lifebook P7120D, which has this
processor:

* Intel Pentium M Processor Ultra Low Voltage 753 (1.20 GHz, 2 MB L2
cache, 400 MHz FSB)

	-Joe


Nathan Smith wrote:
> On 4/20/07, Timothy Redaelli <drizzt@gentoo.org> wrote:
>> Can you try to recompile the kernel with gcc 4 but with -O0?
>> cd /usr/src/sys/i386/compile/GENERIC ; COPTFLAGS=-O0 make
> 
> I can confirm that compiling with gcc-4 and COPTFLAGS=-O0 produces a
> working kernel (i.e. no malformed tcp packets).  This was after I
> found that the gcc41 patch is also not causing the problem.  After
> getting a working kernel with gcc-4 I went back and used the default
> COPTFLAGS again and it broke again.  So I think this gives us a fair
> amount of certainty that the problem is caused by gcc-4 optimizations.
> 
> As to the reason why some FreeBSD users experience this and other do
> not, I am not sure.  The symptoms (broken TCP traffic to some sites)
> depend entirely upon the sites you are connecting to and how your
> connections are routed.  So it is possible that somebody could have
> this problem by not realize it.
> 
> However, using tcpdump I can tell that some machines apparently do not
> experience this problem, so it may be processor-specific (which makes
> sense given that it is an optimization problem).  I use a Pentium M.
> What are other people using that have been affected by the problem?
> 
-- 
gentoo-bsd@gentoo.org mailing list

Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Camille Huot]

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2007/4/20, Nathan Smith <ndansmith@gmail.com>:
>
> The symptoms (broken TCP traffic to some sites)
> depend entirely upon the sites you are connecting to and how your
> connections are routed.


We saw that affected users are sending TCP data with bad checksum
(this could apply to udp and/or icmp too? anyone to check?).

Then, some router on the Internet can decide to drop such bad packet. I
noticed Linux doesn't drop but Checkpoint does.

Another point, note that the bad checksum is always good_checksum+0100
"""
[bad tcp cksum 3de5 (->3ce5)!]
[bad tcp cksum 322d (->312d)!]
[bad tcp cksum 25ad (->24ad)!]
"""

I guess this is the checksum algorithm that is incompatible with -O2. Even
if I won't check the source code :p

However, using tcpdump I can tell that some machines apparently do not
> experience this problem, so it may be processor-specific (which makes
> sense given that it is an optimization problem).  I use a Pentium M.
> What are other people using that have been affected by the problem?


Mine is pentium-4

-- 
Camille Huot

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Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Peter Weller]

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I have a Pentium Coppermine.

cam: I know that when I *do* experience problems and can't connect to
particular sites, I can't ping them, either...

welp

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Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Nicholas Steicke]

Nathan Smith wrote:
> On 4/20/07, Timothy Redaelli <drizzt@gentoo.org> wrote:
>> Can you try to recompile the kernel with gcc 4 but with -O0?
>> cd /usr/src/sys/i386/compile/GENERIC ; COPTFLAGS=-O0 make
> 
> I can confirm that compiling with gcc-4 and COPTFLAGS=-O0 produces a
> working kernel (i.e. no malformed tcp packets).  This was after I
> found that the gcc41 patch is also not causing the problem.  After
> getting a working kernel with gcc-4 I went back and used the default
> COPTFLAGS again and it broke again.  So I think this gives us a fair
> amount of certainty that the problem is caused by gcc-4 optimizations.
> 
> As to the reason why some FreeBSD users experience this and other do
> not, I am not sure.  The symptoms (broken TCP traffic to some sites)
> depend entirely upon the sites you are connecting to and how your
> connections are routed.  So it is possible that somebody could have
> this problem by not realize it.
> 
> However, using tcpdump I can tell that some machines apparently do not
> experience this problem, so it may be processor-specific (which makes
> sense given that it is an optimization problem).  I use a Pentium M.
> What are other people using that have been affected by the problem?
> 

Hey, i had this issue on a Celeron something (the one prior to the 
coppermine series).

After reading a bug on the FreeBSD site ( 
http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/34756 ) i worked out i 
could connect to anything with an ip matching 
[1-209].[1-209].[1-209].[1-209] (ie. if any section of an ip was >=210, 
it would time out) - i tried compiling with '-O0' however the kernel 
still didnt work, even after doing 2x 'emerge -e system' (after much 
pain getting all the packages onto the box) -- any help getting gfbsd 
working would be great!

-- 
--------------------------------
Email: narthollis@narthollis.net
-- 
gentoo-bsd@gentoo.org mailing list

Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Joe Peterson]

Hi Nathan, curios: did you get errors like the following when using
gcc-config to switch to gcc-3?:

/usr/bin/gcc-config: line 390: eend: command not found
/usr/bin/gcc-config: line 394: ewarn: command not found
/usr/bin/gcc-config: line 395: ewarn: command not found
/usr/bin/gcc-config: line 397: ewarn: command not found

These scripts are in /lib/rcscripts/bin, but strange that the path is
not set to find them.

	-Joe

Nathan Smith wrote:
> 1. I emerged =sys-devel/gcc-3*.
> 2. Used gcc-config to set gcc-3 as the system compiler
> 3. Edited the freebsd-sources ebuild to remove the gcc41 patch.
> 4. Emerged freebsd-sources
> 5. Compiled the kernel and rebooted to find I could make normal TCP
> connections to anyone, anywhere.
> 
> So gcc-4.1 seems to be the culprit here.  I will check FreeBSD's
> archives to see if this has come up, but I wonder if they have moved
> to gcc4 yet anyway.  So, give what I posted above a try an let me know
> how it worked for you.
> 
-- 
gentoo-bsd@gentoo.org mailing list

Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Joe Peterson]

BTW, I have recompiled the kernel (did not remove any patches - left the
source as-is) under gcc-3, and my TCP problem is gone.

	-Joe


Nathan Smith wrote:
> On 4/19/07, Camille Huot <cam@gentoo.org> wrote:
>> 2007/4/19, Joe Peterson <joe@skyrush.com>:
>>> A reliable test
>>> case I found is trying to FTP to ftp.astron.com - never works.
>>>
>> I'm experiencing the exact same problem. tcpdump show bad checksums like
>> Nathan, ftp ftp.astron.com doesn't work.
>>
>> My nic is:
>> em0: <Intel(R) PRO/1000 Network Connection Version - 6.2.9> port
>> 0xcc00-0xcc3f mem 0xdfde0000-0xdfdfffff irq 18 at device 2.0 on pci1
>> em0: Ethernet address: 00:11:09:35:c3:81
>>
>> Using a vanilla FreeBSD 6.2 kernel on Gentoo/FreeBSD, networking is working.
>> On #gentoo-bsd we're trying to find the origin
>> of the issue.
>> --
>> Camille Huot
> 
> Victory!
> 
> Here is how I compiled a Gentoo/FreeBSD kernel which does not produce
> broken tcp packets:
> 
> 1. I emerged =sys-devel/gcc-3*.
> 2. Used gcc-config to set gcc-3 as the system compiler
> 3. Edited the freebsd-sources ebuild to remove the gcc41 patch.
> 4. Emerged freebsd-sources
> 5. Compiled the kernel and rebooted to find I could make normal TCP
> connections to anyone, anywhere.
> 
> So gcc-4.1 seems to be the culprit here.  I will check FreeBSD's
> archives to see if this has come up, but I wonder if they have moved
> to gcc4 yet anyway.  So, give what I posted above a try an let me know
> how it worked for you.
> 
-- 
gentoo-bsd@gentoo.org mailing list

Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Nathan Smith]

On 4/22/07, Joe Peterson <joe@skyrush.com> wrote:
> BTW, I have recompiled the kernel (did not remove any patches - left the
> source as-is) under gcc-3, and my TCP problem is gone.

That is good to know.  We now know that over-optimization in gcc-4 is
the source of the problem (somewhere between -O0 and -O2).  So if you
build the kernel with gcc-4 and

# COPTFLAGS=-O0 make

it should also work.  Joe, if you have time, let me know about how
that works.  Thanks.

-- 
Nathan Smith
ndansmith@gmail.com
-- 
gentoo-bsd@gentoo.org mailing list

Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Joe Peterson]

No go.  I recompiled with -O0 & gcc-4.1.2, and now I cannot successfully
do any network communication.  Even "ping localhost" gives:

PING localhost (127.0.0.1): 56 data bytes
^C
--- localhost ping statistics ---
4 packets transmitted, 0 packets received, 100% packet loss


		-Joe


Nathan Smith wrote:
> On 4/22/07, Joe Peterson <joe@skyrush.com> wrote:
>> BTW, I have recompiled the kernel (did not remove any patches - left the
>> source as-is) under gcc-3, and my TCP problem is gone.
> 
> That is good to know.  We now know that over-optimization in gcc-4 is
> the source of the problem (somewhere between -O0 and -O2).  So if you
> build the kernel with gcc-4 and
> 
> # COPTFLAGS=-O0 make
> 
> it should also work.  Joe, if you have time, let me know about how
> that works.  Thanks.
> 
-- 
gentoo-bsd@gentoo.org mailing list

Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Camille Huot]

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2007/4/24, Nathan Smith <ndansmith@gmail.com>:
>
> if you build the kernel with gcc-4 and
>
> # COPTFLAGS=-O0 make
>
> it should also work.


Works for me.

-- 
Camille Huot

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[gentoo-bsd] News on TCP checksum bug: CHOST="i686-gentoo-freebsd6.2" works!

[Joe Peterson]

More news on the TCP checksum issue: compiling the kernel with
CHOST="i686-gentoo-freebsd6.2" and gcc-4.1.2 seems to make the problem
go away.  I have not done much testing, and I have not finished my full
system recompile at i686 (with gcc-4.1.2), but at least the reliable
test case (ftp.astron.com) works with this config.

So we now have another good data point for this problem.

	-Joe
-- 
gentoo-bsd@gentoo.org mailing list