Skip site navigation (1)Skip section navigation (2)
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>

next in thread | previous in thread | raw e-mail | index | archive | help
This is a cryptographically signed message in MIME format.

--------------ms030208070108040609080600
Content-Type: multipart/alternative;
 boundary="------------I5l8nHjmYppWH0zKCbCrNVzJ"

--------------I5l8nHjmYppWH0zKCbCrNVzJ
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit

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]/
--------------I5l8nHjmYppWH0zKCbCrNVzJ
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 8bit

<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body>
    <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>
  </body>
</html>

--------------I5l8nHjmYppWH0zKCbCrNVzJ--

--------------ms030208070108040609080600
Content-Type: application/pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"
Content-Description: S/MIME Cryptographic Signature
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--------------ms030208070108040609080600--



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?8eb0baaa-f22b-57f7-6b6f-6d93ddb2dee5>