Date: Wed, 15 Feb 2012 07:30:23 +0000 (UTC) From: "Justin T. Gibbs" <gibbs@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r231745 - head/sys/cam/scsi Message-ID: <201202150730.q1F7UNr4043195@svn.freebsd.org>
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Author: gibbs Date: Wed Feb 15 07:30:23 2012 New Revision: 231745 URL: http://svn.freebsd.org/changeset/base/231745 Log: Limit the ST3146855LW U320 drive to 55 tags to avoid command timeouts under load. Submitted by: Gelson Borsoi MFC after: 1 day Modified: head/sys/cam/scsi/scsi_xpt.c Modified: head/sys/cam/scsi/scsi_xpt.c ============================================================================== --- head/sys/cam/scsi/scsi_xpt.c Wed Feb 15 06:49:50 2012 (r231744) +++ head/sys/cam/scsi/scsi_xpt.c Wed Feb 15 07:30:23 2012 (r231745) @@ -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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