linux-kernel - Re: [PATCH 1/2] hpsa: limit transfer length to 1MB

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Message-ID: <20170622100657.GG5670@linux-x5ow.site>
Date:   Thu, 22 Jun 2017 12:06:57 +0200
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Yadan Fan <ydfan@...e.com>
Cc:     don.brace@...rosemi.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com, esc.storagedev@...rosemi.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] hpsa: limit transfer length to 1MB

On Thu, Jun 22, 2017 at 05:58:44PM +0800, Yadan Fan wrote:
> The hpsa firmware will bypass the cache for any request larger
> than 1MB, so we should cap the request size to avoid any
> performance degradation in SLE12-SP2.
Upstream doesn't care too much about SLES. 

> References: bsc#1025461

and our internal Bugzilla IDs


How about:
The hpsa firmware will bypass the cache for any requests larger than 1MB, so
we shoould cap the request size to avoid any performance regressions in
kernels later than 4.3 

The same applies for Patch 2/2

-- 
Johannes Thumshirn                                          Storage
jthumshirn@...e.de                                +49 911 74053 689
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