linux-kernel - Re: [PATCH] improve jbd fsync batching

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Message-ID: <49078A97.8020003@redhat.com>
Date:	Tue, 28 Oct 2008 17:56:39 -0400
From:	Ric Wheeler <rwheeler@...hat.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Andreas Dilger <adilger@....com>, Josef Bacik <jbacik@...hat.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] improve jbd fsync batching

Arjan van de Ven wrote:
> On Tue, 28 Oct 2008 15:38:05 -0600
> Andreas Dilger <adilger@....com> wrote:
>
>   
>> On Oct 28, 2008  16:16 -0400, Josef Bacik wrote:
>>     
>>> I also have a min() check in there to make sure we don't sleep
>>> longer than a jiffie in case our storage is super slow, this was
>>> requested by Andrew.
>>>       
>> Is there a particular reason why 1 jiffie is considered the "right
>> amount" of time to sleep, given this is a kernel config parameter and
>> has nothing to do with the storage?  Considering a seek time in the
>> range of ~10ms this would only be right for HZ=100 and the wait would
>>     
>
> well... my disk does a 50 usec seek time or so.. so I don't mind ;-)
>
> in fact it sounds awefully long to me.
>   

For small writes as well as reads?

If so, it would be great to test Josef's patch against your shiny new 
SSD  :-)

ric

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