Re: NFS Performance Between SGI Servers and Linux Clients

[Danny Smith <dannys@cinesite.co.uk>]

Trond Myklebust wrote:

>>>>>>" " == Charles Lever <Lever> writes:
>>>>>>            
>>>>>>
>
>     > trond, isn't there a read ahead value in the client that can be
>     > tweaked?  he could trim down vm_max_readahead, unless there is
>     > a max_readahead[] entry for anonymous file systems.
>
>That should partly help to trim it down unless the client is reading
>from > 1 file at a time. In that case the RPC layer will still try to
>issue more reads (up to MIN(16,vm_max_readahead) requests per process)
>if the network and server permits it.
>
>Beware, though, that vm_max_readahead will effect not only
>NFS. Performance on other tasks may suffer.
>  
>
I will give this a try in Iain's absence. In the real world we *are* likely
to be reading multiple files, however for testing purposes we don't have to.

Danny

-- 
Danny Smith
Senior Systems Administrator, Cinesite (Europe) Ltd
020 7973 4000 - x4055    /    dannys@cinesite.co.uk




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