[CentOS] Too much cpu wait on nfs server when we need to read data on it

On Mon, Jan 25, 2010 at 8:39 AM, fabien faye <fabien at faye.eu> wrote:
> Hi,
>
> I have a big server with 24 Disk on 2 3ware card.

Define 'big'. You're not giving much in terms of memory or cpu specs.

> When i write data on my nfs server everything is fine but when i want to read data i have a lot of cpu wait.

Okay. Have you looked at any performance tuning or elevator/scheduler
adjustments? File system tuning? What have you tried on your own so
far to debug this?

> about the file system, i use ext4 on LVM partition.

Why? Is there a performance reason for you to use ext4 vs ext3?

> Do you have any idea about that.

Not based on the little information you've provided. It would help for
you to supply more detail, and the things you've already looked at.

-- 
During times of universal deceit, telling the truth becomes a revolutionary act.
George Orwell