Re: bdflush/rpciod high CPU utilization, profile does not make sense

Greg Banks
2005-04-06T23:19:31Z

On Wed, Apr 06, 2005 at 06:01:23PM +0200, Jakob Oestergaard wrote:
>
> Problem; during simple tests such as a 'cp largefile0 largefile1' on the
> client (under the mountpoint from the NFS server), the client becomes
> extremely laggy, NFS writes are slow, and I see very high CPU
> utilization by bdflush and rpciod.
>
> For example, writing a single 8G file with dd will give me about
> 20MB/sec (I get 60+ MB/sec locally on the server), and the client rarely
> drops below 40% system CPU utilization.

How large is the client's RAM? What does the following command report
before and during the write?

egrep 'nfs_page|nfs_write_data' /proc/slabinfo

Greg.
--
Greg Banks, R&D Software Engineer, SGI Australian Software Group.
I don't speak for SGI.