Re: [REGRESSION] 2.6.19/2.6.20-rc3 buffered write slowdown

Christoph Lameter
2007-01-10T23:12:02Z

On Thu, 11 Jan 2007, David Chinner wrote:

> Well, pdflush appears to be doing very little on both 2.6.18 and
> 2.6.20-rc3. In both cases kswapd is consuming 10-20% of a CPU and
> all of the pdflush threads combined (I've seen up to 7 active at
> once) use maybe 1-2% of cpu time. This occurs regardless of the
> dirty_ratio setting.

That sounds a bit much for kswapd. How many nodes? Any cpusets in use?

A upper maximum on the number of pdflush threads exists at 8. Are these
multiple files or single file transfers?