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[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>
This commit is contained in:
Salyzyn, Mark 2008-01-08 14:07:57 -08:00 committed by James Bottomley
parent b6ef70f33c
commit b18268fc63
1 changed files with 13 additions and 10 deletions
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23
drivers/scsi/aacraid/linit.c
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@ -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)