Message-ID: <43DFAEC6.3090205@drzeus.cx>
Date: Tue, 31 Jan 2006 19:39:02 +0100
From: Pierre Ossman <drzeus-list@drzeus.cx>
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To: Russell King <rmk+lkml@arm.linux.org.uk>
CC: Jens Axboe <axboe@suse.de>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: How to map high memory for block io
References: <20060127201458.GA2767@flint.arm.linux.org.uk> <20060127202206.GH9068@suse.de> <20060127202646.GC2767@flint.arm.linux.org.uk> <43DA84B2.8010501@drzeus.cx> <43DA97A3.4080408@drzeus.cx> <20060127225428.GD2767@flint.arm.linux.org.uk> <20060128191759.GC9750@suse.de> <43DBC6E2.4000305@drzeus.cx> <20060129152228.GF13831@suse.de> <43DDC6F9.6070007@drzeus.cx> <20060130080930.GB4209@suse.de>
In-Reply-To: <20060130080930.GB4209@suse.de>
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Jens Axboe wrote:
> On Mon, Jan 30 2006, Pierre Ossman wrote:
>   
>> Jens Axboe wrote:
>>     
>>>
>>> Ah, you need to disable clustering to prevent that from happening! I was
>>> confused there for a while.
>>>
>>>   
>>>       
>> And which is the lesser evil, highmem bounce buffers or disabling
>> clustering? I'd probably vote for the former since the MMC overhead can
>> be quite large.
>>     
>
> Disabling clustering is by far the least expensive way to accomplish it.
>
>   

Russell, what's your view on this? And how should we handle it with
regard to MMC drivers?

Rgds
Pierre

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