[Bug 209571] NVMe performing poorly. TRIM requests stall I/O activity

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Tue Feb 19 10:30:27 UTC 2019


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209571

--- Comment #13 from Borja Marcos <borjam at 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 lack 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 this
issue? Disabling TRIMs. It's better to do some TRIMs than none at all. 

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.

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