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scsi: storvsc: Reduce default ring buffer size to 128 Kbytes

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Reduce the default VMbus channel ring buffer size for storvsc SCSI devices
from 1 Mbyte to 128 Kbytes. Measurements show that ring buffer sizes above
128 Kbytes do not increase performance even at very high IOPS rates, so
don't waste the memory. Also remove the dependence on PAGE_SIZE, since the
ring buffer size should not change on architectures where PAGE_SIZE is not
4 Kbytes.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Michael Kelley 2019-04-01 21:42:06 +00:00 committed by Martin K. Petersen
parent 382e06d11e
commit ed2e63aaec
1 changed files with 1 additions and 1 deletions
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drivers/scsi/storvsc_drv.c
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@ -385,7 +385,7 @@ enum storvsc_request_type {
* This is the end of Protocol specific defines.
*/
static int storvsc_ringbuffer_size = (256 * PAGE_SIZE);
static int storvsc_ringbuffer_size = (128 * 1024);
static u32 max_outstanding_req_per_channel;
static int storvsc_vcpus_per_sub_channel = 4;