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From: Alexander Motin <mav@FreeBSD.org>
Date: Sat, 9 Jun 2012 09:08:34 +0000 (UTC)
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Subject: svn commit: r236803 - stable/8/sys/cam/scsi
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X-List-Received-Date: Sat, 09 Jun 2012 09:08:34 -0000
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