Date: Sat, 9 Jun 2012 09:08:34 +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-8@freebsd.org Subject: svn commit: r236803 - stable/8/sys/cam/scsi Message-ID: <201206090908.q5998YxB019755@svn.freebsd.org>
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Author: mav Date: Sat Jun 9 09:08:33 2012 New Revision: 236803 URL: http://svn.freebsd.org/changeset/base/236803 Log: MFC r231745 (by gibbs): Limit the ST3146855LW U320 drive to 55 tags to avoid command timeouts under load. Submitted by: Gelson Borsoi Modified: stable/8/sys/cam/scsi/scsi_xpt.c Directory Properties: stable/8/sys/ (props changed) Modified: stable/8/sys/cam/scsi/scsi_xpt.c ============================================================================== --- stable/8/sys/cam/scsi/scsi_xpt.c Sat Jun 9 09:04:59 2012 (r236802) +++ stable/8/sys/cam/scsi/scsi_xpt.c Sat Jun 9 09:08:33 2012 (r236803) @@ -293,6 +293,14 @@ 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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