linux-ext4 - Re: [PATCH] imporve jbd2 fsync batching

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Date:	Thu, 06 Nov 2008 07:45:38 -0500
From:	Ric Wheeler <rwheeler@...hat.com>
To:	Theodore Tso <tytso@....edu>
CC:	Andreas Dilger <adilger@....com>, Josef Bacik <jbacik@...hat.com>,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] imporve jbd2 fsync batching

Theodore Tso wrote:
> On Wed, Nov 05, 2008 at 04:10:12PM -0700, Andreas Dilger wrote:
>   
>> There was no reply to my previous comments about making the maximum sleep
>> time be a fixed value (e.g. 15ms) instead of having it arbitrarily based
>> on the jiffies value, which may change between 1ms and 10ms.
>>     
>
> I know the whole point is to make it be self-tuning, but I wonder if
> we should have some knobs to control the min and max sleep times.
>
>    	          	       	    	     	     - Ted
>   

I think that it could be useful to have a tunable knob for the max sleep 
time. It would certainly be capped at a much lower level for a RAM disk 
than it would be for a very large RAID volume...

Ric

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