Re: ioflush kernel thread chewing CPU time

[Andrew Doran <ad%NetBSD.org@localhost>]

On Wed, Mar 25, 2009 at 12:56:59PM +1100, Simon Burge wrote:

> Simon Burge wrote:
> 
> > [ profiling working with enami's patch ]
> 
> I've got two 30-second profiles while I'm seeing ioflush using a lot
> of CPU time.  With a profiled kernel I'm seeing ioflush use about 30-35%
> instead of the "normal" 20%.  The first of these is with top running,
> the second while the machine should be otherwise completely idle:
> 
>   ftp://ftp.netbsd.org/pub/NetBSD/misc/simonb/ioflush-gmon.txt.A.bz2
>   ftp://ftp.netbsd.org/pub/NetBSD/misc/simonb/ioflush-gmon.txt.B.bz2
> 
> I've not looked at them myself yet...

Those were very useful, thanks. I have committed another set of fixes.
Can you try running with them and see if the problem still occurs?