Date: Wed, 22 Jan 2020 01:03:24 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r356959 - stable/12/share/man/man4 Message-ID: <202001220103.00M13OSm042310@repo.freebsd.org>
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Author: mav Date: Wed Jan 22 01:03:24 2020 New Revision: 356959 URL: https://svnweb.freebsd.org/changeset/base/356959 Log: MFC r347967 (by cem): nvd.4: Reference nda(4) Fix a totally minor typo in nvme.4 while here. Modified: stable/12/share/man/man4/nvd.4 stable/12/share/man/man4/nvme.4 Directory Properties: stable/12/ (props changed) Modified: stable/12/share/man/man4/nvd.4 ============================================================================== --- stable/12/share/man/man4/nvd.4 Wed Jan 22 00:52:42 2020 (r356958) +++ stable/12/share/man/man4/nvd.4 Wed Jan 22 01:03:24 2020 (r356959) @@ -33,7 +33,7 @@ .\" .\" $FreeBSD$ .\" -.Dd January 28, 2016 +.Dd May 18, 2019 .Dt NVD 4 .Os .Sh NAME @@ -86,6 +86,7 @@ hw.nvd.delete_max=<delete size in bytes> .Ed .Sh SEE ALSO .Xr GEOM 4 , +.Xr nda 4 , .Xr nvme 4 , .Xr geom 8 , .Xr nvmecontrol 8 , Modified: stable/12/share/man/man4/nvme.4 ============================================================================== --- stable/12/share/man/man4/nvme.4 Wed Jan 22 00:52:42 2020 (r356958) +++ stable/12/share/man/man4/nvme.4 Wed Jan 22 01:03:24 2020 (r356959) @@ -120,11 +120,28 @@ hw.nvme.force_intx=1 .Pp Note that use of INTx implies disabling of per-CPU I/O queue pairs. .Pp -When there is an error, -.Nm -prints only the most relevant information about the command by default. -To enable dumping of all information about the command, set the following tunable -value in +The +.Xr nvd 4 +driver is used to provide a disk driver to the system by default. +The +.Xr nda 4 +driver can also be used instead. +The +.Xr nvd 4 +driver performs better with smaller transactions and few TRIM +commands. +It sends all commands directly to the drive immediately. +The +.Xr nda 4 +driver performs better with larger transactions and also collapses +TRIM commands giving better performance. +It can queue commands to the drive; combine +.Dv BIO_DELETE +commands into a single trip; and +use the CAM I/O scheduler to bias one type of operation over another. +To select the +.Xr nda 4 +driver, set the following tunable value in .Xr loader.conf 5 : .Bd -literal -offset indent hw.nvme.verbose_cmd_dump=1
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