[PATCH 2/2] smartpqi: limit transfer length to 1MB

From	Yadan Fan <ydfan@suse.com>
Newsgroups	linux.kernel
Subject	[PATCH 2/2] smartpqi: limit transfer length to 1MB
Date	2017-06-22 12:10 +0200
Message-ID	<tV7dN-3dT-35@gated-at.bofh.it> (permalink)
References	<tV7dL-3dT-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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The smartpqi firmware will bypass the cache for any request larger
than 1MB, so we should cap the request size to avoid any
performance degradation on SLE12-SP2

This degradation is caused from d2be537c3ba3568acd79cd178327b842e60d035e,
which changed max_sectors_kb to 1280k, but the hardware is able to
work fine with it, so the true fix should be from smartpqi driver.

Reference: bsc#1025461

Signed-off-by: Yadan Fan <ydfan@suse.com>
---
 drivers/scsi/smartpqi/smartpqi.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/smartpqi/smartpqi.h b/drivers/scsi/smartpqi/smartpqi.h
index b673825f46b5..9513357bd472 100644
--- a/drivers/scsi/smartpqi/smartpqi.h
+++ b/drivers/scsi/smartpqi/smartpqi.h
@@ -630,7 +630,7 @@ struct pqi_encryption_info {
 };
 
 #define PQI_MAX_OUTSTANDING_REQUESTS	((u32)~0)
-#define PQI_MAX_TRANSFER_SIZE		(4 * 1024U * 1024U)
+#define PQI_MAX_TRANSFER_SIZE		(1024U * 1024U)
 
 #define RAID_MAP_MAX_ENTRIES		1024
 
-- 
2.12.3

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[PATCH 1/2] hpsa: limit transfer length to 1MB Yadan Fan <ydfan@suse.com> - 2017-06-22 12:10 +0200
  [PATCH 2/2] smartpqi: limit transfer length to 1MB Yadan Fan <ydfan@suse.com> - 2017-06-22 12:10 +0200

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