Date: Fri, 17 Feb 2012 01:23:58 +0000 (UTC) From: "Justin T. Gibbs" <gibbs@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r231850 - stable/9/sys/cam/scsi Message-ID: <201202170123.q1H1NwWU043462@svn.freebsd.org>
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Author: gibbs Date: Fri Feb 17 01:23:58 2012 New Revision: 231850 URL: http://svn.freebsd.org/changeset/base/231850 Log: MFC r231745: Limit the ST3146855LW U320 drive to 55 tags to avoid command timeouts under load. Submitted by: Gelson Borsoi Modified: stable/9/sys/cam/scsi/scsi_xpt.c Directory Properties: stable/9/sys/ (props changed) Modified: stable/9/sys/cam/scsi/scsi_xpt.c ============================================================================== --- stable/9/sys/cam/scsi/scsi_xpt.c Fri Feb 17 01:21:08 2012 (r231849) +++ stable/9/sys/cam/scsi/scsi_xpt.c Fri Feb 17 01:23:58 2012 (r231850) @@ -295,6 +295,14 @@ static struct scsi_quirk_entry scsi_quir }, { /* + * Experiences command timeouts under load with a + * tag count higher than 55. + */ + { T_DIRECT, SIP_MEDIA_FIXED, seagate, "ST3146855LW", "*"}, + /*quirks*/0, /*mintags*/2, /*maxtags*/55 + }, + { + /* * Slow when tagged queueing is enabled. Write performance * steadily drops off with more and more concurrent * transactions. Best sequential write performance with
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