Martin Drab found that he could get aacraid timeouts with high load on
his controller / disk drive combinations. After some experimentation
Mark Salyzyn has come up with a patch to reduce the default max_sectors
to something that will keep the controller from being overloaded and
will eliminate the timeout issues.
Patch against scsi-misc-2.6 git tree.
Signed-off-by: Mark Haverkamp <[EMAIL PROTECTED]>
Index: scsi-misc-2.6/drivers/scsi/aacraid/aacraid.h
===================================================================
--- scsi-misc-2.6.orig/drivers/scsi/aacraid/aacraid.h 2005-07-08
09:22:20.000000000 -0700
+++ scsi-misc-2.6/drivers/scsi/aacraid/aacraid.h 2005-07-08
09:23:52.000000000 -0700
@@ -15,11 +15,7 @@
#define AAC_MAX_LUN (8)
#define AAC_MAX_HOSTPHYSMEMPAGES (0xfffff)
-/*
- * max_sectors is an unsigned short, otherwise limit is 0x100000000 / 512
- * Linux has starvation problems if we permit larger than 4MB I/O ...
- */
-#define AAC_MAX_32BIT_SGBCOUNT ((unsigned short)8192)
+#define AAC_MAX_32BIT_SGBCOUNT ((unsigned short)512)
/*
* These macros convert from physical channels to virtual channels
Index: scsi-misc-2.6/drivers/scsi/aacraid/linit.c
===================================================================
--- scsi-misc-2.6.orig/drivers/scsi/aacraid/linit.c 2005-06-27
09:57:38.000000000 -0700
+++ scsi-misc-2.6/drivers/scsi/aacraid/linit.c 2005-07-08 09:23:52.000000000
-0700
@@ -374,7 +374,8 @@
else
scsi_adjust_queue_depth(sdev, 0, 1);
- if (host->max_sectors < AAC_MAX_32BIT_SGBCOUNT)
+ if (!(((struct aac_dev *)host->hostdata)->adapter_info.options
+ & AAC_OPT_NEW_COMM))
blk_queue_max_segment_size(sdev->request_queue, 65536);
return 0;
--
Mark Haverkamp <[EMAIL PROTECTED]>
--
Mark Haverkamp <[EMAIL PROTECTED]>
-
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