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

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Date:   Fri, 23 Jun 2017 17:12:54 +0800
From:   Yadan Fan <ydfan@...e.com>
To:     Johannes Thumshirn <jthumshirn@...e.de>
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

Hi Johannes,


On 2017年06月22日 18:06, Johannes Thumshirn wrote:
> 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

Yes, I agree so, I will resend the modified patches.

Thanks,
Yadan