Date: Sat, 9 Jan 2016 05:07:03 +0000 (UTC) From: Ravi Pokala <rpokala@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r293464 - stable/10/share/man/man4 Message-ID: <201601090507.u09573Ax030469@repo.freebsd.org>
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Author: rpokala Date: Sat Jan 9 05:07:02 2016 New Revision: 293464 URL: https://svnweb.freebsd.org/changeset/base/293464 Log: MFC r292123: Document mps.enable_ssu mps(4) sends StartStopUnit to SATA direct-access devices during shutdown. Document the tunables which control that behavior. Approved by: jhb Sponsored by: Panasas, Inc. Modified: stable/10/share/man/man4/mps.4 Directory Properties: stable/10/ (props changed) Modified: stable/10/share/man/man4/mps.4 ============================================================================== --- stable/10/share/man/man4/mps.4 Sat Jan 9 05:05:15 2016 (r293463) +++ stable/10/share/man/man4/mps.4 Sat Jan 9 05:07:02 2016 (r293464) @@ -34,7 +34,7 @@ .\" $Id: //depot/SpectraBSD/head/share/man/man4/mps.4#6 $ .\" $FreeBSD$ .\" -.Dd January 3, 2013 +.Dd December 9, 2015 .Dt MPS 4 .Os .Sh NAME @@ -129,6 +129,8 @@ driver instance, set the following tunab dev.mps.X.disable_msix=1 .Ed .Pp +where X is the adapter number. +.Pp To set the maximum number of DMA chains allocated for all adapters, set the following variable in .Xr loader.conf 5 : @@ -166,6 +168,39 @@ The maximum number of active I/O command dev.mps.X.io_cmds_highwater .Xr sysctl 8 variable. +.Pp +The adapter can issue the +.Sy StartStopUnit +SCSI command to SATA direct-access devices during shutdown, to allow the +device to quiesce before being powered down. +To control this feature for all adapters, set the +.Bd -literal -offset indent +hw.mps.enable_ssu +.Ed +.Pp +tunable value in +.Xr loader.conf 5 +to one of the following values: +.Bl -tag -width 6n -offset indent +.It 0 +Do not send SSU to either HDDs or SSDs. +.It 1 +Send SSU to SSDs, but not to HDDs; this is the default value. +.It 2 +Send SSU to HDDs, but not to SSDs. +.It 3 +Send SSU to both HDDs and SSDs. +.El +.Pp +To control the feature for a specific adapter, set the following tunable +value in +.Xr loader.conf 5 : +.Bd -literal -offset indent +dev.mps.X.enable_ssu +.Ed +.Pp +where X is the adapter number. +The same set of values are valid as for all adapters. .Sh DEBUGGING To enable debugging prints from the .Nm @@ -218,7 +253,7 @@ This man page was written by This driver has a couple of known shortcomings: .Bl -bullet -compact .It -No userland utility available (e.g. +No userland utility available (e.g., .Xr mptutil 8 ) . .It The driver probes devices sequentially.
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