Re: NFS and kernel 2.6.x

Marcelo Tosatti
2004-04-16T15:25:28Z

On Thu, Apr 15, 2004 at 10:29:06PM -0700, Trond Myklebust wrote:
> På to , 15/04/2004 klokka 21:59, skreiv Phil Oester:
>
> > If simply upgrading from 2.4.x to 2.6.x is going to make UDP mounts unusable,
> > perhaps this should be documented -- or the option should be deprecated.
>
> Put simply: I am not interested in wasting _my_ time investigating cases
> where UDP is performing badly if TCP is working fine. The variable
> reliability issues with UDP are precisely why we worked to get the TCP
> stuff working efficiently.
>
> As for blanket statements like the above: I have seen no evidence yet
> that they are any more warranted in 2.6.x than they were in 2.4.x. At
> least not as long as I continue to see wire speed performance on reads
> and writes on UDP on all my own test setups.

Maaybe TCP should be the default then ? In case no one finds the reason
why NFS over UDP is slower on 2.6.x than 2.4.x. It seems there are
quite a few reports confirming the slowdown. Maybe Jamie Lokier is right in
theory?