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authorSalyzyn, Mark <Mark_Salyzyn@adaptec.com>2008-01-08 14:07:57 -0800
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-01-23 11:29:21 -0600
commitb18268fc631034882f5f3dd93daa248a3bfdd085 (patch)
tree6180457b1bff327306a10846e0b1422671633574
parentb6ef70f33ca2a3084b4fea12414550724a9114dc (diff)
downloadlinux-next-b18268fc631034882f5f3dd93daa248a3bfdd085.tar.gz
[SCSI] aacraid: improve queue balancing
The adapter queue is divided up equally to all the arrays to prevent command starvation to any individual array. On the other hand, physical targets are only granted a queue depth of one each. The code prior to this patch used to deal with the incremental discovery of targets, but the driver knows how many arrays are present prior to the scan so this knowledge is used to generate a better estimate for the queue depth. Remove the capability of 'physical=0' from preventing access to the class of adapters that have the RAID/SCSI mode of operation since none of the physicals on the SCSI channel are candidates ever for an array. As always, the user can override this default queue depth policy by making the appropriate adjustments utilizing sysfs. Signed-off-by: Mark Salyzyn <aacraid@adaptec.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
-rw-r--r--drivers/scsi/aacraid/linit.c23
1 files changed, 13 insertions, 10 deletions
diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index 6a553ea730db..0523cc6d895c 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -401,16 +401,14 @@ static int aac_biosparm(struct scsi_device *sdev, struct block_device *bdev,
static int aac_slave_configure(struct scsi_device *sdev)
{
+ struct aac_dev *aac = (struct aac_dev *)sdev->host->hostdata;
if ((sdev->type == TYPE_DISK) &&
- (sdev_channel(sdev) != CONTAINER_CHANNEL)) {
+ (sdev_channel(sdev) != CONTAINER_CHANNEL) &&
+ (!aac->raid_scsi_mode || (sdev_channel(sdev) != 2))) {
if (expose_physicals == 0)
return -ENXIO;
- if (expose_physicals < 0) {
- struct aac_dev *aac =
- (struct aac_dev *)sdev->host->hostdata;
- if (!aac->raid_scsi_mode || (sdev_channel(sdev) != 2))
- sdev->no_uld_attach = 1;
- }
+ if (expose_physicals < 0)
+ sdev->no_uld_attach = 1;
}
if (sdev->tagged_supported && (sdev->type == TYPE_DISK) &&
(sdev_channel(sdev) == CONTAINER_CHANNEL)) {
@@ -419,6 +417,7 @@ static int aac_slave_configure(struct scsi_device *sdev)
unsigned num_lsu = 0;
unsigned num_one = 0;
unsigned depth;
+ unsigned cid;
/*
* Firmware has an individual device recovery time typically
@@ -426,11 +425,15 @@ static int aac_slave_configure(struct scsi_device *sdev)
*/
if (sdev->timeout < (45 * HZ))
sdev->timeout = 45 * HZ;
+ for (cid = 0; cid < aac->maximum_num_containers; ++cid)
+ if (aac->fsa_dev[cid].valid)
+ ++num_lsu;
__shost_for_each_device(dev, host) {
if (dev->tagged_supported && (dev->type == TYPE_DISK) &&
- (sdev_channel(dev) == CONTAINER_CHANNEL))
- ++num_lsu;
- else
+ (sdev_channel(dev) == CONTAINER_CHANNEL)) {
+ if (!aac->fsa_dev[sdev_id(dev)].valid)
+ ++num_lsu;
+ } else
++num_one;
}
if (num_lsu == 0)