[34-longterm 040/260] staging: hv: Increased storvsc ringbuffer and max_io_requests

Paul Gortmaker
2011-01-02T07:22:08Z

From: Hank Janssen <hjanssen@microsoft.com>

commit 15dd1c9f53b31cdc84b8072a88c23fa09527c596 upstream.

Increased storvsc ringbuffer and max_io_requests. This now more
closely mimics the numbers on Hyper-V. And will allow more IO requests
to take place for the SCSI driver.

Max_IO is set to double from what it was before, Hyper-V allows it and
we have had appliance builder requests to see if it was a problem to
increase the number.

Ringbuffer size for storvsc is now increased because I have seen A few buffer
problems on extremely busy systems. They were Set pretty low before.
And since max_io_requests is increased I Really needed to increase the buffer
as well.

Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
drivers/staging/hv/StorVscApi.h | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/hv/StorVscApi.h b/drivers/staging/hv/StorVscApi.h
index 126a858..aad90bd 100644
--- a/drivers/staging/hv/StorVscApi.h
+++ b/drivers/staging/hv/StorVscApi.h
@@ -28,10 +28,10 @@
#include "VmbusApi.h"

/* Defines */
-#define STORVSC_RING_BUFFER_SIZE (10*PAGE_SIZE)
+#define STORVSC_RING_BUFFER_SIZE (20*PAGE_SIZE)
#define BLKVSC_RING_BUFFER_SIZE (20*PAGE_SIZE)

-#define STORVSC_MAX_IO_REQUESTS 64
+#define STORVSC_MAX_IO_REQUESTS 128

/*
* In Hyper-V, each port/path/target maps to 1 scsi host adapter. In
--
1.7.3.3