Date: Fri, 4 Mar 2022 15:06:03 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-fs@freebsd.org Subject: Re: md disks EXTREMELY slow 12.3-STABLE Message-ID: <8eb0baaa-f22b-57f7-6b6f-6d93ddb2dee5@denninger.net> In-Reply-To: <e775b9ba-d506-8189-ab18-c8bc4f384c42@gmx.at> References: <97013161-b119-4c98-a294-c733ca000a34@denninger.net> <e775b9ba-d506-8189-ab18-c8bc4f384c42@gmx.at>
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On 3/4/2022 14:34, infoomatic wrote:
> On 04.03.22 17:22, Karl Denninger wrote:
>> Load average is 0.3 yet the md0 drive is pinned at 100% busy with just
>> 50 transactions-per-second!
>
> you mean md(4), the memory disk, right? ... just to be sure it is no typo
>
Correct.
I think I've found the issue -- The "-13" build is using a vnode on the
spinning rust ZFS pool (albeit a fairly high-performance one comprised
of mirrored vdevs) for backing store. I'm not sure WHY this winds up
being so insanely slow, but it does. I'm going to move it either to
memory/swap (since I have a bunch) or stick it on the SSD pool since
creating an md in RAM is, as expected, ridiculously fast.
--
Karl Denninger
karl@denninger.net
/The Market Ticker/
/[S/MIME encrypted email preferred]/
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<div class="moz-cite-prefix">On 3/4/2022 14:34, infoomatic wrote:<br>
</div>
<blockquote type="cite"
cite="mid:e775b9ba-d506-8189-ab18-c8bc4f384c42@gmx.at">On 04.03.22
17:22, Karl Denninger wrote:
<br>
<blockquote type="cite">Load average is 0.3 yet the md0 drive is
pinned at 100% busy with just
<br>
50 transactions-per-second!
<br>
</blockquote>
<br>
you mean md(4), the memory disk, right? ... just to be sure it is
no typo
<br>
<br>
</blockquote>
<p>Correct.</p>
<p>I think I've found the issue -- The "-13" build is using a vnode
on the spinning rust ZFS pool (albeit a fairly high-performance
one comprised of mirrored vdevs) for backing store. I'm not sure
WHY this winds up being so insanely slow, but it does. I'm going
to move it either to memory/swap (since I have a bunch) or stick
it on the SSD pool since creating an md in RAM is, as expected,
ridiculously fast.<br>
</p>
<div class="moz-signature">-- <br>
Karl Denninger<br>
<a href="mailto:karl@denninger.net" class="moz-txt-link-freetext">karl@denninger.net</a><br>
<i>The Market Ticker</i><br>
<font size="-2"><i>[S/MIME encrypted email preferred]</i></font></div>
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