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On 5/2/2024 10:16 AM, Warner Losh wrote:
>
> When trims are fast, you want to send them to the drive as soon as you
> know the blocks are freed. UFS always does this (if trim is enabled at
> all).
> ZFS has a lot of knobs to control when / how / if this is done.
>
> vfs.zfs.vdev.trim_min_active: 1
> vfs.zfs.vdev.trim_max_active: 2
> vfs.zfs.trim.queue_limit: 10
> vfs.zfs.trim.txg_batch: 32
> vfs.zfs.trim.metaslab_skip: 0
> vfs.zfs.trim.extent_bytes_min: 32768
> vfs.zfs.trim.extent_bytes_max: 134217728
> vfs.zfs.l2arc.trim_ahead: 0
>
> I've not tried to tune these in the past, but you can see how they affect things.
>
Thanks Warner, I will try and play around with these values to see if
they impact things. BTW, do you know what / why things would be
"skipped" during trim events ?
kstat.zfs.zrootoffs.misc.iostats.trim_bytes_failed: 0
kstat.zfs.zrootoffs.misc.iostats.trim_extents_failed: 0
kstat.zfs.zrootoffs.misc.iostats.trim_bytes_skipped: 5968330752
kstat.zfs.zrootoffs.misc.iostats.trim_extents_skipped: 503986
kstat.zfs.zrootoffs.misc.iostats.trim_bytes_written: 181593186304
kstat.zfs.zrootoffs.misc.iostats.trim_extents_written: 303115
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<div class="moz-cite-prefix">On 5/2/2024 10:16 AM, Warner Losh
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CANCZdfqx_vhNb2BukbM0bxrf8NH_9sXPKW+Uf=LdoXjw_2w=Dg@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div class="gmail_quote"><br>
<div>When trims are fast, you want to send them to the drive
as soon as you</div>
<div>know the blocks are freed. UFS always does this (if trim
is enabled at all).</div>
<div>ZFS has a lot of knobs to control when / how / if this is
done.</div>
<div><br>
</div>
<div>
<pre id="gmail-line1">vfs.zfs.vdev.trim_min_active: 1
vfs.zfs.vdev.trim_max_active: 2
vfs.zfs.trim.queue_limit: 10
vfs.zfs.trim.txg_batch: 32
vfs.zfs.trim.metaslab_skip: 0
vfs.zfs.trim.extent_bytes_min: 32768
vfs.zfs.trim.extent_bytes_max: 134217728
vfs.zfs.l2arc.trim_ahead: 0
</pre>
<pre id="gmail-line1">I've not tried to tune these in the past, but you can see how they affect things.
</pre>
</div>
<br>
</div>
</div>
</blockquote>
<p>Thanks Warner, I will try and play around with these values to
see if they impact things. BTW, do you know what / why things
would be "skipped" during trim events ?</p>
<p>kstat.zfs.zrootoffs.misc.iostats.trim_bytes_failed: 0<br>
kstat.zfs.zrootoffs.misc.iostats.trim_extents_failed: 0<br>
kstat.zfs.zrootoffs.misc.iostats.trim_bytes_skipped: 5968330752<br>
kstat.zfs.zrootoffs.misc.iostats.trim_extents_skipped: 503986<br>
kstat.zfs.zrootoffs.misc.iostats.trim_bytes_written: 181593186304<br>
kstat.zfs.zrootoffs.misc.iostats.trim_extents_written: 303115<br>
</p>
<p><br>
</p>
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