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| author |   Michael Kelley <mikelley@microsoft.com> | 2019-04-01 21:42:06 +0000 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2019-04-03 23:31:03 -0400 |
| commit | ed2e63aaec4fbf248275d2d83c4cfd65e069594f (patch) | |
| tree | 6be9aa5c1961ebb8001aacd9fb4ba72772fa3bc2 /drivers | |
| parent | scsi: storvsc: Fix calculation of sub-channel count (diff) | |
| download | linux-dev-ed2e63aaec4fbf248275d2d83c4cfd65e069594f.tar.xz linux-dev-ed2e63aaec4fbf248275d2d83c4cfd65e069594f.zip | |
scsi: storvsc: Reduce default ring buffer size to 128 Kbytes
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/storvsc_drv.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index e186743033f4..8472de1007ff 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -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; |