From: Mark Haverkamp Date: Tue, 2 Aug 2005 04:11:37 +0000 (-0700) Subject: [PATCH] aacraid: Fix for controller load based timeouts X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=43f2f3d343f9d00a94a9242547a59d9dfb2338c4;p=linux-beck.git [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 Cc: James Bottomley Acked-by: Mark Salyzyn Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h index 3a11a536c0da..4ab07861b457 100644 --- a/drivers/scsi/aacraid/aacraid.h +++ b/drivers/scsi/aacraid/aacraid.h @@ -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 diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c index c1a4f978fcba..562da90480a1 100644 --- a/drivers/scsi/aacraid/linit.c +++ b/drivers/scsi/aacraid/linit.c @@ -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;