Re: [RFC] nfs: use 2*rsize readahead size

[Dave Chinner]

On Wed, Feb 24, 2010 at 12:43:56PM +0800, Wu Fengguang wrote:
> On Wed, Feb 24, 2010 at 12:24:14PM +0800, Dave Chinner wrote:
> > On Wed, Feb 24, 2010 at 02:29:34PM +1100, Dave Chinner wrote:
> > > That's doing a cached read out of the server cache, right? You
> > > might find the results are different if the server has to read the
> > > file from disk. I would expect reads from the server cache not
> > > to require much readahead as there is no IO latency on the server
> > > side for the readahead to hide....
> > 
> > FWIW, if you mount the client with "-o rsize=32k" or the server only
> > supports rsize <= 32k then this will probably hurt throughput a lot
> > because then readahead will be capped at 64k instead of 480k....
> 
> I should have mentioned that in changelog.. Hope the updated one
> helps.

Sorry, my fault for not reading the code correctly.

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx
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