netdev - Re: [PATCH 13/17] mlx4: Add blue flame support for kernel consumers

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Message-Id: <20110307.134931.232736253.davem@davemloft.net>
Date:	Mon, 07 Mar 2011 13:49:31 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eli@....mellanox.co.il
Cc:	roland@...estorage.com, netdev@...r.kernel.org
Subject: Re: [PATCH 13/17] mlx4: Add blue flame support for kernel consumers

From: Eli Cohen <eli@....mellanox.co.il>
Date: Mon, 7 Mar 2011 23:48:12 +0200

> On Mon, Mar 07, 2011 at 01:40:01PM -0800, David Miller wrote:
>> From: Eli Cohen <eli@....mellanox.co.il>
>> Date: Mon, 7 Mar 2011 23:36:48 +0200
>> 
>> > Specifically, some archs may not support write combining.
>> 
>> They should just create a non-write-combining mapping if they
>> don't support it.
>> 
> 
> I wouldn't expect that since the caller function could be mislead to
> believe it has a write combining capable area.

It's a performance optimization, if you don't get write combining you'll
get more strict ordering, rather than less.

It cannot cause problem.
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