Date: Fri, 4 Mar 2022 11:22:56 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-fs@freebsd.org Subject: md disks EXTREMELY slow 12.3-STABLE Message-ID: <97013161-b119-4c98-a294-c733ca000a34@denninger.net>
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Not a little slow, RIDICULOUSLY slow.
Crochet uses these. Since 12.3 the effective I/O rate, which pegs them
at 100% busy, is in the 50tps (!!) range. This is a machine with a
crap-ton of available RAM (over 10Gb) and effectively no swap use,
running off SSD for the root pool (ZFS.) Load average is 0.3 yet the md0
drive is pinned at 100% busy with just 50 transactions-per-second!
This used to be fast in 12.2 and before.
Any ideas as to what might have changed that is causing this?
FreeBSD 12.3-STABLE #18 stable/12-n234659-7963d46bb8c-dirty: Wed Dec 29
10:59:44 EST 2021
--
Karl Denninger
karl@denninger.net
/The Market Ticker/
/[S/MIME encrypted email preferred]/
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<p>Not a little slow, RIDICULOUSLY slow.</p>
<p>Crochet uses these. Since 12.3 the effective I/O rate, which
pegs them at 100% busy, is in the 50tps (!!) range. This is a
machine with a crap-ton of available RAM (over 10Gb) and
effectively no swap use, running off SSD for the root pool (ZFS.)
Load average is 0.3 yet the md0 drive is pinned at 100% busy with
just 50 transactions-per-second!<br>
</p>
<p>This used to be fast in 12.2 and before.</p>
<p>Any ideas as to what might have changed that is causing this?</p>
<p>FreeBSD 12.3-STABLE #18 stable/12-n234659-7963d46bb8c-dirty: Wed
Dec 29 10:59:44 EST 2021 <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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