Date: Tue, 28 Nov 2017 22:31:44 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-fs@FreeBSD.org Subject: [Bug 209571] ZFS and NVMe performing poorly. TRIM requests stall I/O activity Message-ID: <bug-209571-3630-jxlDOy9VTm@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 Warner Losh <imp@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |imp@FreeBSD.org --- Comment #4 from Warner Losh <imp@FreeBSD.org> --- nvd and nda have the opposite problem that da/ada have. ada/da collapse as = many BIO_DELETE commands down into a single TRIM to the device. That's why limit= ing helps since huge trims take a long time. nvd/nda, however, has the opposite problem. They do no trim collapsing at a= ll, so flood the device with TRIM requests that starve read/write requests. --=20 You are receiving this mail because: You are the assignee for the bug.=
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