--- On Thu, 1/14/10, Jean-Francois <[email protected]> wrote:
> From: Jean-Francois <[email protected]>
> Subject: Re: Maximizing File/Network I/O
> To: [email protected]
> Received: Thursday, January 14, 2010, 12:53 PM
> Le mardi 05 janvier 2010 09:04:53,
> nixlists a icrit :
> > On Tue, Jan 5, 2010 at 1:45 AM, Bret S. Lambert <[email protected]>
> wrote:
> > > Start with mount_nfs options, specifically -r and
> -w; I assume that
> > > you would have mentioned tweaking those if you
> had already done so.
> >
> > Setting -r and -w to 16384, and jumbo frames to 9000
> yields just a
> > couple of MB/s more. Far from 10 MB/s more the network
> can do ;(
> >
>
> For some reasone, when I mount NFS drives with -r=4096 and
> -w=4096 I reach
> the best transfer rates.
>
This is possibly because the OS is able to match the request to a single memory
page for your architecture. Other architectures offer larger page sizes.
Not saying that's the case, but a possibility.
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