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103fbf8e40
linux/drivers/scsi/megaraid
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Kashyap Desai 103fbf8e40 scsi: megaraid_sas: Added support for shared host tagset for cpuhotplug 
Fusion adapters can steer completions to individual queues, and
we now have support for shared host-wide tags.
So we can enable multiqueue support for fusion adapters.

Once driver enable shared host-wide tags, cpu hotplug feature is also
supported as it was enabled using below patchsets -
commit bf0beec060 ("blk-mq: drain I/O when all CPUs in a hctx are
offline")

Currently driver has provision to disable host-wide tags using
"host_tagset_enable" module parameter.

Once we do not have any major performance regression using host-wide
tags, we will drop the hand-crafted interrupt affinity settings.

Performance is also meeting the expecatation - (used both none and
mq-deadline scheduler)
24 Drive SSD on Aero with/without this patch can get 3.1M IOPs
3 VDs consist of 8 SAS SSD on Aero with/without this patch can get 3.1M
IOPs.

Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Tested-by: Douglas Gilbert <dgilbert@interlog.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-10-06 08:33:44 -06:00
..
Kconfig.megaraid SCSI misc on 20190709 2019-07-11 15:14:01 -07:00
Makefile scsi: megaraid_sas: Export RAID map through debugfs 2019-06-18 19:46:20 -04:00
mbox_defs.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
mega_common.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
megaraid_ioctl.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
megaraid_mbox.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
megaraid_mbox.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
megaraid_mm.c scsi: megaraid: Fix kdoc comments format 2020-07-08 01:00:30 -04:00
megaraid_mm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
megaraid_sas_base.c scsi: megaraid_sas: Added support for shared host tagset for cpuhotplug 2020-10-06 08:33:44 -06:00
megaraid_sas_debugfs.c scsi: megaraid_sas: Remove unused including <linux/version.h> 2019-06-18 19:46:25 -04:00
megaraid_sas_fp.c scsi: megaraid: Remove set but unused variable 2020-07-08 01:02:11 -04:00
megaraid_sas_fusion.c scsi: megaraid_sas: Added support for shared host tagset for cpuhotplug 2020-10-06 08:33:44 -06:00
megaraid_sas_fusion.h scsi: megaraid_sas: Replace undefined MFI_BIG_ENDIAN macro with __BIG_ENDIAN_BITFIELD macro 2020-05-11 23:06:24 -04:00
megaraid_sas.h scsi: megaraid: Fix compilation warnings 2020-07-08 01:01:30 -04:00