lkml.org 
[lkml]   [2007]   [Dec]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: read-ahead in NFS server
> >> Are you using TCP?  Are you using NFSv4, or an older version?
> > I'm using NFSv3/UDP.
>
> IMO, you definitely want TCP and NFSv4. Much better network behavior,
> with some of the silly UDP limits (plus greatly improved caching
> behavior, due to v4 delegations).
the clients of my system going to be embedded system with low
performance cpus and I need UDP as it needs less cpu power.

> > when I run local dd with bs=4K, I can see that the average IO size is
> > more than 300KB.
>
> Read-ahead is easier in NFSv4, because the client probably has the file
> delegated locally, and has far less need to constantly revalidate file
> mapping(s).
I'll check that.
but what about the server side? why the issued IO's are only as twice
as the size of the NFS requests?


\
 
 \ /
  Last update: 2007-12-27 16:03    [from the cache]
©2003-2011 Jasper Spaans