[gentoo-amd64] Clock skew

[gentoo-amd64] Clock skew

[Jonathan Resino]

I have an asus A8N-SLI premium board and cannot seem to get my clock
to stop skewing, it gains an hour almost every hour.  It has gotten to
be quite irritating, and reading over the forums I'm not sure if there
is a definite fix.  Anyone have any suggestions?

Thanks

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Re: [gentoo-amd64] Clock skew

[Homer Parker]

On Tue, 2005-10-18 at 18:14 -0400, Jonathan Resino wrote:
> I have an asus A8N-SLI premium board and cannot seem to get my clock
> to stop skewing, it gains an hour almost every hour.  It has gotten to
> be quite irritating, and reading over the forums I'm not sure if there
> is a definite fix.  Anyone have any suggestions?
> 
> Thanks

http://bugzilla.kernel.org/show_bug.cgi?id=3927

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Gentoo/AMD64 Team
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Gentoo Developer Relations
hparker@gentoo.org

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Re: [gentoo-amd64] Clock skew

[Neil Stone]

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Jonathan Resino wrote:
> I have an asus A8N-SLI premium board and cannot seem to get my clock
> to stop skewing, it gains an hour almost every hour.  It has gotten to
> be quite irritating, and reading over the forums I'm not sure if there
> is a definite fix.  Anyone have any suggestions?
> 
> Thanks
> 

As a work around, maybe use ntpdate on a cron job ?
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Re: [gentoo-amd64] Clock skew

[Michael Kjorling]

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On 2005-10-18 18:14 -0400, jresino@gmail.com wrote:
> I have an asus A8N-SLI premium board and cannot seem to get my clock
> to stop skewing, it gains an hour almost every hour.  It has gotten to
> be quite irritating, and reading over the forums I'm not sure if there
> is a definite fix.  Anyone have any suggestions?

NTP?

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Re: [gentoo-amd64] Clock skew

[Neil Stone]

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Michael Kjorling wrote:
> On 2005-10-18 18:14 -0400, jresino@gmail.com wrote:
> 
>>>I have an asus A8N-SLI premium board and cannot seem to get my clock
>>>to stop skewing, it gains an hour almost every hour.  It has gotten to
>>>be quite irritating, and reading over the forums I'm not sure if there
>>>is a definite fix.  Anyone have any suggestions?
> 
> 
> NTP?
> 
great minds ?
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Re: [gentoo-amd64] Clock skew

[Michael Kjorling]

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On 2005-10-18 23:53 +0100, neil@flashtek-uk.com wrote:
>> NTP?
> 
> great minds ?

So they say, but I'd be careful with running ntpdate from a cron job.
I recall a recent discussion (think it was on linux@yahoogroups.com,
but could be wrong) where one person was having real trouble because
of it resetting the system clock. When he converted to running ntpd
instead, the problem disappeared.

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Re: [gentoo-amd64] Clock skew

[Stuart Haas]

>
>
> As a work around, maybe use ntpdate on a cron job ?

I'd suggest openntpd.  Very easy to configure and works great.  Solves
the problem of having to use ntpdate.

Stuart
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Re: [gentoo-amd64] Clock skew

[P.V.Anthony]

Stuart Haas wrote:
>>
>> As a work around, maybe use ntpdate on a cron job ?
> 
> I'd suggest openntpd.  Very easy to configure and works great.  Solves
> the problem of having to use ntpdate.
> 
> Stuart

You may want to try htpdate from http://www.clevervest.com/htp/development.html

P.V.Anthony

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Re: [gentoo-amd64] Clock skew

[Mike Williams]

On Wednesday 19 October 2005 00:20, Stuart Haas wrote:
> > As a work around, maybe use ntpdate on a cron job ?
>
> I'd suggest openntpd.  Very easy to configure and works great.  Solves
> the problem of having to use ntpdate.

Sadly ntpd would not work in this case, as ntpd can only handle a skew of, 
IIRC, around 43 seconds per hour.
I've just been through something similar with my mac mini, it would lose 
several minutes an hour. I used adjtimex to alter the TICK value slightly 
(from 10000 to 10030), so that ntpd could keep up.
Jonathans skew is almost certainly the same as the kernel bug posted by Homer.

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Re: [gentoo-amd64] Clock skew

[Richard Freeman]

On Tue, October 18, 2005 7:03 pm, Michael Kjorling wrote:
> So they say, but I'd be careful with running ntpdate from a cron job.
> I recall a recent discussion (think it was on linux@yahoogroups.com,
> but could be wrong) where one person was having real trouble because
> of it resetting the system clock. When he converted to running ntpd
> instead, the problem disappeared.
>

Hmm, my guess (somewhat educated) is that ntpdate is abruptly changing the
clock, while ntpd normally just slews the clock by adjusting the timer
settings.  This means that every second on the clock still ticks with
ntpd, but not with ntpdate.  That probably has a big impact on anything
that uses real-time-clock scheduling - especially if you're running
ntpdate once a minute or something like that.

I'm not sure how multimedia works in linux - it may not use the system
clock for timing.  If it did I could definintely see issues happening if
buffers run out or if video/audio get out of sync.

I personally just let leave the RTC on GMT and run ntpd.  It is mostly
fire-and-forget.  As others have pointed out though, it doesn't handle
clock slews this large easily (maybe there is a parameter or
source-code-constant that can be tweaked to compensate).
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Re: [gentoo-amd64] Clock skew

[Marcus D. Hanwell]

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On Tuesday 18 October 2005 23:14, Jonathan Resino wrote:
> I have an asus A8N-SLI premium board and cannot seem to get my clock
> to stop skewing, it gains an hour almost every hour.  It has gotten to
> be quite irritating, and reading over the forums I'm not sure if there
> is a definite fix.  Anyone have any suggestions?
>
Are you running a dual core CPU? If so I had this issue and it is due to TSC 
sync. Emerge gentoo-sources-2.6.13-r4 and it has a patch that fixes this 
issue.
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Re: [gentoo-amd64] Clock skew

[Kirby Walborn]

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Jonathan Resino wrote:
> I have an asus A8N-SLI premium board and cannot seem to get my clock
> to stop skewing, it gains an hour almost every hour.  It has gotten to
> be quite irritating, and reading over the forums I'm not sure if there
> is a definite fix.  Anyone have any suggestions?
> 
> Thanks
> 

Just out of curiosity are you using a dual core processor?  These have
clock issues that can be solved with different boot parameters or as
I've done by going to an mm series kernel.  The mm series kernel has the
patches installed to fix the dual core clock issues.
- --

Kirby Walborn
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Re: [gentoo-amd64] Clock skew

[Jonathan Resino]

This is a Athlon XP 64 4400+ X2 so it's dual core.

On 10/18/05, Kirby Walborn <kirby@walborncattle.com> wrote:
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> Hash: SHA1
>
> Jonathan Resino wrote:
> > I have an asus A8N-SLI premium board and cannot seem to get my clock
> > to stop skewing, it gains an hour almost every hour.  It has gotten to
> > be quite irritating, and reading over the forums I'm not sure if there
> > is a definite fix.  Anyone have any suggestions?
> >
> > Thanks
> >
>
> Just out of curiosity are you using a dual core processor?  These have
> clock issues that can be solved with different boot parameters or as
> I've done by going to an mm series kernel.  The mm series kernel has the
> patches installed to fix the dual core clock issues.
> - --
>
> Kirby Walborn
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> gentoo-amd64@gentoo.org mailing list
>
>

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Re: [gentoo-amd64] Clock skew

[Tony Johnson]

On Wed, 19 Oct 2005 10:58, Marcus D. Hanwell wrote:
> On Tuesday 18 October 2005 23:14, Jonathan Resino wrote:
> > I have an asus A8N-SLI premium board and cannot seem to get my clock
> > to stop skewing, it gains an hour almost every hour.  It has gotten to
> > be quite irritating, and reading over the forums I'm not sure if there
> > is a definite fix.  Anyone have any suggestions?
>
> Are you running a dual core CPU? If so I had this issue and it is due to
> TSC sync. Emerge gentoo-sources-2.6.13-r4 and it has a patch that fixes
> this issue.

Hmmm.. I have the same issue, and this upgrade to 2.6.13-r4 did not appear to 
fix the problem. My clock still gains many seconds per minute.  Of course, if 
I rebuild the same kernel without SMP it works like a charm.

An additional problem is in my XP vmware... with SMP, the "keeyyyboooaaarrrd" 
is crazy, and any media files (.wmv, .ram, etc) run at x4 speed. Most 
annoying.

I have:
AMD Athlon 64 X2 Dual Core Processor 3800+
2Gb Geil RAM

Regards
Tony Johnson
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Re: [gentoo-amd64] Clock skew

[Jonathan Schaeffer]

2005/10/19, Tony Johnson <tony@tosp.net.au>:

>
> An additional problem is in my XP vmware... with SMP, the "keeyyyboooaaarrrd"
> is crazy, and any media files (.wmv, .ram, etc) run at x4 speed. Most
> annoying.
>
> I have:
> AMD Athlon 64 X2 Dual Core Processor 3800+
> 2Gb Geil RAM

Have you tried to remove a CPU and a Gb of your RAM ?

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Re: [gentoo-amd64] Clock skew

[Mark Haney]

Tony Johnson wrote:

>On Wed, 19 Oct 2005 10:58, Marcus D. Hanwell wrote:
>  
>
>>On Tuesday 18 October 2005 23:14, Jonathan Resino wrote:
>>    
>>
>>>I have an asus A8N-SLI premium board and cannot seem to get my clock
>>>to stop skewing, it gains an hour almost every hour.  It has gotten to
>>>be quite irritating, and reading over the forums I'm not sure if there
>>>is a definite fix.  Anyone have any suggestions?
>>>      
>>>
Had this problem when I first got this laptop running FC4, it's a known 
kernel bug and the only real way I know to make it go away is to use 
no-timer-check in the kernel boot parameters.

>>Are you running a dual core CPU? If so I had this issue and it is due to
>>TSC sync. Emerge gentoo-sources-2.6.13-r4 and it has a patch that fixes
>>this issue.
>>    
>>
>
>Hmmm.. I have the same issue, and this upgrade to 2.6.13-r4 did not appear to 
>fix the problem. My clock still gains many seconds per minute.  Of course, if 
>I rebuild the same kernel without SMP it works like a charm.
>
>An additional problem is in my XP vmware... with SMP, the "keeyyyboooaaarrrd" 
>is crazy, and any media files (.wmv, .ram, etc) run at x4 speed. Most 
>annoying.
>  
>

I noticed this as well, the only problem is, the issue seems to be with 
XP.  I have had nothing but trouble out of it when running on Dual Core 
CPUs.  Is the XP version you are using the 32bit?  or 64bit?  I bet it's 
the former based on the (x4) in the post, as the 64bit version would 
probably sound only twice as fast.  Granted I'm only guessing.

>I have:
>AMD Athlon 64 X2 Dual Core Processor 3800+
>2Gb Geil RAM
>
>Regards
>Tony Johnson
>  
>


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Re: [gentoo-amd64] Clock skew

[Tony Johnson]

On Wed, 19 Oct 2005 22:16, Jonathan Schaeffer wrote:
> 2005/10/19, Tony Johnson <tony@tosp.net.au>:
> > An additional problem is in my XP vmware... with SMP, the
> > "keeyyyboooaaarrrd" is crazy, and any media files (.wmv, .ram, etc) run
> > at x4 speed. Most annoying.
> >
> > I have:
> > AMD Athlon 64 X2 Dual Core Processor 3800+
> > 2Gb Geil RAM
>
> Have you tried to remove a CPU and a Gb of your RAM ?

:) It all works fine if the kernel is built without SMP (= effectively 1 
processor, and with the 2Gb RAM) Anyway, i can't remove any RAM due to the 
slot configuration (2 x 1Gb)
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Re: [gentoo-amd64] Clock skew

[Tony Johnson]

On Wed, 19 Oct 2005 22:21, Mark Haney wrote:
>
> Had this problem when I first got this laptop running FC4, it's a known
> kernel bug and the only real way I know to make it go away is to use
> no-timer-check in the kernel boot parameters.
>

This is my grub.conf setting:

kernel /kernel-genkernel-x86_64-2.6.13-gentoo-r4 root=/dev/ram0 init=/linuxrc 
ramdisk=8192 real_root=/dev/sda3 udev no_timer_check=0 acpi=noirq noapic 
iommu=memaper=2 vga=0x318

should the "no_timer_check" =1 or =0 ?

> I noticed this as well, the only problem is, the issue seems to be with
> XP.  I have had nothing but trouble out of it when running on Dual Core
> CPUs.  Is the XP version you are using the 32bit?  or 64bit?  I bet it's
> the former based on the (x4) in the post, as the 64bit version would
> probably sound only twice as fast.  Granted I'm only guessing.
>

Yes, it's 32bit
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Re: [gentoo-amd64] Clock skew

[James Pattinson]

Tony Johnson wrote:

>On Wed, 19 Oct 2005 22:16, Jonathan Schaeffer wrote:
>  
>
>>2005/10/19, Tony Johnson <tony@tosp.net.au>:
>>    
>>
>>>An additional problem is in my XP vmware... with SMP, the
>>>"keeyyyboooaaarrrd" is crazy, and any media files (.wmv, .ram, etc) run
>>>at x4 speed. Most annoying.
>>>
>>>I have:
>>>AMD Athlon 64 X2 Dual Core Processor 3800+
>>>2Gb Geil RAM
>>>      
>>>
>>Have you tried to remove a CPU and a Gb of your RAM ?
>>    
>>
>
>:) It all works fine if the kernel is built without SMP (= effectively 1 
>processor, and with the 2Gb RAM) Anyway, i can't remove any RAM due to the 
>slot configuration (2 x 1Gb)
>  
>
My timer was running more or less exactly 2x speed, and I had the same 
vmware issue as you. The patch near the end of 
http://bugzilla.kernel.org/show_bug.cgi?id=3927 worked for me, but it 
only works when you have NO "apic-" line on your kernel command line.

Cheers
James
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Re: [gentoo-amd64] Clock skew

[Hemmann, Volker Armin]

On Wednesday 19 October 2005 00:14, Jonathan Resino wrote:
> I have an asus A8N-SLI premium board and cannot seem to get my clock
> to stop skewing, it gains an hour almost every hour.  It has gotten to
> be quite irritating, and reading over the forums I'm not sure if there
> is a definite fix.  Anyone have any suggestions?
>
> Thanks

do you have hpet or pm-timer compiled into your kernel?
If no, try it.

Did you try the latest bios?
if not, maybe it helps.
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Re: [gentoo-amd64] Clock skew

[Tony Johnson]

On Wed, 19 Oct 2005 23:50, James Pattinson wrote:
> Tony Johnson wrote:
> >On Wed, 19 Oct 2005 22:16, Jonathan Schaeffer wrote:
> >>2005/10/19, Tony Johnson <tony@tosp.net.au>:
> >>>An additional problem is in my XP vmware... with SMP, the
> >>>"keeyyyboooaaarrrd" is crazy, and any media files (.wmv, .ram, etc) run
> >>>at x4 speed. Most annoying.
> >>>
>
> My timer was running more or less exactly 2x speed, and I had the same
> vmware issue as you. The patch near the end of
> http://bugzilla.kernel.org/show_bug.cgi?id=3927 worked for me, but it
> only works when you have NO "apic-" line on your kernel command line.

Thanks James. I removed the "noapic" from grub.conf, rebooted, and everything 
was great. Then I changed *nothing*, rebooted again, and it was back to the 
old silliness... very strange :(
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Re: [gentoo-amd64] Clock skew

[James Pattinson]

Tony Johnson wrote:

>>My timer was running more or less exactly 2x speed, and I had the same
>>vmware issue as you. The patch near the end of
>>http://bugzilla.kernel.org/show_bug.cgi?id=3927 worked for me, but it
>>only works when you have NO "apic-" line on your kernel command line.
>>    
>>
>Thanks James. I removed the "noapic" from grub.conf, rebooted, and everything 
>was great. Then I changed *nothing*, rebooted again, and it was back to the 
>old silliness... very strange :(
>  
>
That's strange. Did you apply the patch in the bugzilla? The only weird 
thing I get now are APIC errors in the syslog when the system is doing 
heavyish I/O.

James
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