linux-kernel - [029/129] staging: hv: Increased storvsc ringbuffer and max_io

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Date:	Sat, 18 Sep 2010 12:12:07 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Hank Janssen <hjanssen@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: [029/129] staging: hv: Increased storvsc ringbuffer and max_io_requests

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Hank Janssen <hjanssen@...rosoft.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@...rosoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/staging/hv/storvsc_api.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/staging/hv/storvsc_api.h
+++ b/drivers/staging/hv/storvsc_api.h
@@ -28,10 +28,10 @@
 #include "vmbus_api.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

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