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Date:      Tue, 19 Feb 2019 10:30:24 +0000
From:      bugzilla-noreply@freebsd.org
To:        fs@FreeBSD.org
Subject:   [Bug 209571] NVMe performing poorly. TRIM requests stall I/O activity
Message-ID:  <bug-209571-3630-tG48MYw9wL@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-209571-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-209571-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D209571

--- Comment #13 from Borja Marcos <borjam@sarenet.es> ---
(In reply to Peter Eriksson from comment #12)

But that would suggest a firmware problem? In my experience with NVMEs the
situation improved a lot with a firmware update. Although of course the lac=
k of
trmi collapse is a problem.

I still think that maybe discarding TRIM operations in serious congestion
situations is a lesser evil. After all, what are people doing when facing t=
his
issue? Disabling TRIMs. It's better to do some TRIMs than none at all.=20

Certainly you cannot discard read/write operations like you would discard
packets on a network in order to enforce a bandwidth limit. Buffering them
doesn't help either when applications need to commit data to storage.

--=20
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