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[PATCH] aacraid: Fix for controller load based timeouts 

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.

Signed-off-by: Mark Haverkamp <markh@osdl.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Acked-by: Mark Salyzyn <mark_salyzyn@adaptec.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mark Haverkamp 2005-08-01 21:11:37 -07:00 committed by Linus Torvalds
parent 2757a71c31
commit 43f2f3d343
2 changed files with 3 additions and 6 deletions
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6
drivers/scsi/aacraid/aacraid.h
View File

@ -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

3
drivers/scsi/aacraid/linit.c
View File

@ -374,7 +374,8 @@ static int aac_slave_configure(struct scsi_device *sdev)
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;