On Thu, Nov 13, 2008 at 01:10:00PM -0600, Bruce Guenter wrote:
> On Thu, Nov 13, 2008 at 12:57:12PM -0600, Bruce Guenter wrote:
> > Ouch. Why is ext4 so much slower than ext3 here,
>
> I forgot to mention one important detail. I started running 'vmstat 5'
> during one of the unlink runs, and noticed that there were intervals of
> 15 or 20 seconds where no blocks were being read or written, and minimal
> CPU was being used. I do not observe the same stalls when using ext3.
Hmm... how very strange. Can you run the command:
ps -eo pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,wchan:16,comm
during one of the quiescent periods, and see what is in the WCHAN
field for the unlink command?
- Ted
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