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[SCSI] aic94xx: Increase can_queue for better performance
This patch sets can_queue in the aic94xx driver's scsi_host to better performing values than what's there currently. It seems that asd_ha->seq.can_queue reflects the number of requests that can be queued per controller; so long as there's one scsi_host per controller, it seems logical that the scsi_host ought to have the same can_queue value. To the best of my (still limited) knowledge, this method provides the correct value. The effect of leaving this value set to 1 is terrible performance in the case of either (a) certain Maxtor SAS drives flying solo or (b) flooding several disks with I/O simultaneously (md-raid). There may be more scenarios where we see similar problems that I haven't uncovered. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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@ -620,6 +620,8 @@ static int __devinit asd_pci_probe(struct pci_dev *dev,
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asd_ha->hw_prof.bios.present ? "build " : "not present",
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asd_ha->hw_prof.bios.bld);
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shost->can_queue = asd_ha->seq.can_queue;
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if (use_msi)
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pci_enable_msi(asd_ha->pcidev);
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