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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