| Message ID | 20220414103601.140687-1-sumit.saxena@broadcom.com |
|---|---|
| State | New |
| Headers | show |
| Series | scsi: increase max device queue_depth to 4096 | expand |
Sumit, > Maximum SCSI device queue depth limited to 1024 is not sufficient for > RAID volumes configured behind Broadcom RAID controllers. For a 16 > drives RAID volume with 1024 device QD, per drive 64 IOs(1024/16) can > be issued which is not good enough to achieve performance target. Applied to 5.19/scsi-staging, thanks!
On Thu, 14 Apr 2022 06:36:01 -0400, Sumit Saxena wrote: > Maximum SCSI device queue depth limited to 1024 is not sufficient > for RAID volumes configured behind Broadcom RAID controllers. > For a 16 drives RAID volume with 1024 device QD, per drive > 64 IOs(1024/16) can be issued which is not good enough to achieve > performance target. > > > [...] Applied to 5.19/scsi-queue, thanks! [1/1] scsi: increase max device queue_depth to 4096 https://git.kernel.org/mkp/scsi/c/f9bdac31cf4b
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 211aace69c22..735b6c862b46 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -200,11 +200,11 @@ void scsi_finish_command(struct scsi_cmnd *cmd) /* - * 1024 is big enough for saturating fast SCSI LUNs. + * 4096 is big enough for saturating fast SCSI LUNs. */ int scsi_device_max_queue_depth(struct scsi_device *sdev) { - return min_t(int, sdev->host->can_queue, 1024); + return min_t(int, sdev->host->can_queue, 4096); } /**
Maximum SCSI device queue depth limited to 1024 is not sufficient for RAID volumes configured behind Broadcom RAID controllers. For a 16 drives RAID volume with 1024 device QD, per drive 64 IOs(1024/16) can be issued which is not good enough to achieve performance target. Cc: Ming Lei <ming.lei@redhat.com> Cc: Hannes Reinecke <hare@suse.de> Cc: Bart Van Assche <bvanassche@acm.org> Cc: Sumanesh Samanta <sumanesh.samanta@broadcom.com> Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com> --- drivers/scsi/scsi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)