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[SCSI] scsi/block: increase flush/sync timeout 

We have been seeing the flush request timeout with a wide
range of hardware from tgt+iser to FC targets from a major vendor.

After discussions about if the value should be configurable and
what the best value should be, this patch just increases the flush/sync
cache timeout to 1 minute. 2 minutes was determined to be too long, and
making it configurable was troublesome for users.

This patch was made over Linus's tree. It is not made over scsi-misc
or scsi-rc-fixes, because Linus's had block layer changes that my
patch was built over.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Acked-by: Jens Axboe <jaxboe@fusionio.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Mike Christie 2010-08-11 11:06:25 -05:00 committed by James Bottomley
parent 1c1acab036
commit e3b3e62467
2 changed files with 3 additions and 2 deletions
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4
drivers/scsi/sd.c
View File

@ -477,7 +477,7 @@ static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
{
rq->timeout = SD_TIMEOUT;
rq->timeout = SD_FLUSH_TIMEOUT;
rq->retries = SD_MAX_RETRIES;
rq->cmd[0] = SYNCHRONIZE_CACHE;
rq->cmd_len = 10;
@ -1072,7 +1072,7 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
* flush everything.
*/
res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
SD_TIMEOUT, SD_MAX_RETRIES, NULL);
SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
if (res == 0)
break;
}

1
drivers/scsi/sd.h
View File

@ -19,6 +19,7 @@
*/
#define SD_TIMEOUT (30 * HZ)
#define SD_MOD_TIMEOUT (75 * HZ)
#define SD_FLUSH_TIMEOUT (60 * HZ)
/*
* Number of allowed retries