Re: Many processes stuck in blk_congestion_wait

Fengguang Wu
2008-01-28T03:16:24Z

On Wed, Jan 23, 2008 at 05:19:14PM -0500, Sev Binello wrote:
> We are experiencing numerous hangs/slow downs on our WS4 U5 nfs client
> machines (not seen on WS3).
> Many processes end up in a D state for long periods of time
> and are in blk_congestion_wait().
>
> Time in this state can vary,
> not sure what triggers them to come out, some don't
> But time in this state can be quite lengthy.

> Machines are running 2.6.9-55.0.9.ELsmp

It's a pretty old kernel. If possible, a kernel upgrade may well fix
your problem.