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Subject: Re: [gentoo-user] 32GB RAM and Swap
To: gentoo-user@lists.gentoo.org
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From: Dale <rdalek1967@gmail.com>
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Message-ID: <b1fd611e-2dfc-052a-fa14-85b2f0b0eb0f@gmail.com>
Date: Sat, 2 May 2020 09:19:33 -0500
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Michael wrote:
> On Saturday, 2 May 2020 10:54:02 BST Dale wrote:
>> Michael wrote:
>>> I'd be interested to know as a comparison if Nikos' and Dale's I/O
>>> unresponsiveness in swapping sees an improvement with the I/O scheduler
>>> for
>>> spinning drives set to bfq; e.g.:
>>>
>>> echo bfq > /sys/block/sda/queue/scheduler
>> This is its setting at the moment.
>>
>>
>> root@fireball / # cat /sys/block/sda/queue/scheduler
>> noop deadline [cfq]
>> root@fireball / #
> Ahh, you must be on an older kernel?
>
> I'm on 5.4.28 here and these are the new kernel scheduler options:
>
> #
> # IO Schedulers
> #
> CONFIG_MQ_IOSCHED_DEADLINE=y
> CONFIG_MQ_IOSCHED_KYBER=y
> CONFIG_IOSCHED_BFQ=y
> CONFIG_BFQ_GROUP_IOSCHED=y
> # CONFIG_BFQ_CGROUP_DEBUG is not set
> # end of IO Schedulers
>
> The BFQ scheduler has a number of tunable parameters via sysctl, like weight,
> latency and what not, but unless you're into running endless benchmark tests
> to tune your particular devices, I'd leave it to do its thing with default
> settings.
>
Yea, I got new UPS batteries coming which means a complete power down.
I may upgrade my kernel before doing that. It slipped my mind so glad
this came up. I'm on 4.19.40-gentoo but I need to see what is the
latest version nvidia-drivers supports first. I guess I'll google that
or something.
>> I know I can echo it in but where do I set that to that when booting?
> You can set a local script to switch from other schedulers - the default is
> mq-deadline - or you can disable the others in the kernel. I don't know if
> you can pass an option to the kernel line at boot time.
>
> I understand this is more effective with slow(er) spinning drives and perhaps
> old SSDs. NVMe drives won't benefit from it and are better run with the
> default mq-deadline scheduler.
I googled it, it seems it gets added to the kernel line options via
grub2's conf file. I have another option there too, IOMMU or something
like that.
Right now, it's off to the tractor and discing up my garden. So much
rain lately, I'm just now able to get a tractor in it. New disc is
awesome tho.
Oh, for future reference:
# cat /etc/sysconfig/grub
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet elevator=cfq"
GRUB_DISABLE_RECOVERY="true"
It's the 2nd line from the bottom. It may be configurable in menuconfig too. I dunno know yet. I'll try to look. Must make note to upgrade kernel. Batteries will be here Monday.
Thanks much. It's on my todo list.
Dale
:-) :-)
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<div class="moz-cite-prefix">Michael wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5501031.MhkbZ0Pkbq@lenovo.localdomain">
<pre wrap="">On Saturday, 2 May 2020 10:54:02 BST Dale wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Michael wrote:
</pre>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<blockquote type="cite">
<pre wrap="">I'd be interested to know as a comparison if Nikos' and Dale's I/O
unresponsiveness in swapping sees an improvement with the I/O scheduler
for
spinning drives set to bfq; e.g.:
echo bfq > /sys/block/sda/queue/scheduler
</pre>
</blockquote>
<pre wrap="">
This is its setting at the moment.
root@fireball / # cat /sys/block/sda/queue/scheduler
noop deadline [cfq]
root@fireball / #
</pre>
</blockquote>
<pre wrap="">
Ahh, you must be on an older kernel?
I'm on 5.4.28 here and these are the new kernel scheduler options:
#
# IO Schedulers
#
CONFIG_MQ_IOSCHED_DEADLINE=y
CONFIG_MQ_IOSCHED_KYBER=y
CONFIG_IOSCHED_BFQ=y
CONFIG_BFQ_GROUP_IOSCHED=y
# CONFIG_BFQ_CGROUP_DEBUG is not set
# end of IO Schedulers
The BFQ scheduler has a number of tunable parameters via sysctl, like weight,
latency and what not, but unless you're into running endless benchmark tests
to tune your particular devices, I'd leave it to do its thing with default
settings.
</pre>
</blockquote>
<br>
<br>
Yea, I got new UPS batteries coming which means a complete power
down. I may upgrade my kernel before doing that. It slipped my
mind so glad this came up. I'm on 4.19.40-gentoo but I need to see
what is the latest version nvidia-drivers supports first. I guess
I'll google that or something. <br>
<br>
<br>
<blockquote type="cite"
cite="mid:5501031.MhkbZ0Pkbq@lenovo.localdomain">
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">I know I can echo it in but where do I set that to that when booting?
</pre>
</blockquote>
<pre wrap="">
You can set a local script to switch from other schedulers - the default is
mq-deadline - or you can disable the others in the kernel. I don't know if
you can pass an option to the kernel line at boot time.
I understand this is more effective with slow(er) spinning drives and perhaps
old SSDs. NVMe drives won't benefit from it and are better run with the
default mq-deadline scheduler.
</pre>
</blockquote>
<br>
<br>
I googled it, it seems it gets added to the kernel line options via
grub2's conf file. I have another option there too, IOMMU or
something like that. <br>
<br>
Right now, it's off to the tractor and discing up my garden. So
much rain lately, I'm just now able to get a tractor in it. New
disc is awesome tho. <br>
<br>
Oh, for future reference:<br>
<br>
<br>
<pre># cat /etc/sysconfig/grub
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet elevator=cfq"
GRUB_DISABLE_RECOVERY="true"
It's the 2nd line from the bottom. It may be configurable in menuconfig too. I dunno know yet. I'll try to look. Must make note to upgrade kernel. Batteries will be here Monday.
Thanks much. It's on my todo list.
Dale
:-) :-)
</pre>
</body>
</html>
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