scsi: megaraid_sas: Load balance completions across all MSI-X

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Driver will use "reply descriptor post queues" in round robin fashion when
the combined MSI-X mode is not enabled. With this IO completions are
distributed and load balanced across all the available reply descriptor
post queues equally.

This is enabled only if combined MSI-X mode is not enabled in firmware.
This improves performance and also fixes soft lockups.

When load balancing is enabled, IRQ affinity from driver needs to be
disabled.

Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

...

This commit is contained in:

Shivasharan S 2019-05-07 10:05:36 -07:00 • committed by Martin K. Petersen

parent 62a04f81e6

commit 1d15d9098a

3 changed files with 35 additions and 8 deletions

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3

drivers/scsi/megaraid/megaraid_sas.h

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22

drivers/scsi/megaraid/megaraid_sas_base.c

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18

drivers/scsi/megaraid/megaraid_sas_fusion.c

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