linux-kernel - Re: 2.6.20-rc2+: CFQ halving disk throughput.

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Date:	Tue, 02 Jan 2007 11:24:37 +0100
From:	Rene Herman <rene.herman@...il.com>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	Andrew Morton <akpm@...l.org>, Tejun Heo <htejun@...il.com>,
	Jens Axboe <axboe@...e.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...l.org>
Subject: Re: 2.6.20-rc2+: CFQ halving disk throughput.

Jens Axboe wrote:

> On Mon, Jan 01 2007, Andrew Morton wrote:

>> The patch would appear to need this fix:
>>
>> --- a/block/cfq-iosched.c~a
>> +++ a/block/cfq-iosched.c
>> @@ -592,7 +592,7 @@ static int cfq_allow_merge(request_queue
>>  	if (cfqq == RQ_CFQQ(rq))
>>  		return 1;
>>  
>> -	return 1;
>> +	return 0;
>>  }
>>  
>>  static inline void
>> _
>>
>> But that might not fix things...
> 
> Yeah it is, but I don't think it'll fix it (if anything, it'll be more
> conservative).

(to possibly save others from trying -- no, doesn't fix any)

Rene.
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