Re: [PATCH v2 2/2] smartpqi: limit transfer length to 1MB

From	Johannes Thumshirn <jthumshirn@suse.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2 2/2] smartpqi: limit transfer length to 1MB
Date	2017-06-23 15:10 +0200
Message-ID	<tVwvv-2AS-15@gated-at.bofh.it> (permalink)
References	<tVtnX-rz-3@gated-at.bofh.it> <tVtnX-rz-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Fri, Jun 23, 2017 at 05:40:06PM +0800, Yadan Fan wrote:
> 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 in kernels later than v4.3
> 
> 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.
> 
> Signed-off-by: Yadan Fan <ydfan@suse.com>
> ---

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
-- 
Johannes Thumshirn                                          Storage
jthumshirn@suse.de                                +49 911 74053 689
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[PATCH v2 2/2] smartpqi: limit transfer length to 1MB Yadan Fan <ydfan@suse.com> - 2017-06-23 11:50 +0200
  Re: [PATCH v2 2/2] smartpqi: limit transfer length to 1MB Johannes Thumshirn <jthumshirn@suse.de> - 2017-06-23 15:10 +0200

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