Re: [RFC][PATCH] iowait statistics

Rik van Riel (riel@conectiva.com.br)
Tue, 14 May 2002 13:36:00 -0300 (BRT)

On Tue, 14 May 2002, William Lee Irwin III wrote:
> On Mon, May 13, 2002 at 10:19:26PM -0300, Rik van Riel wrote:
> > 2) if no process is running, the timer interrupt adds a jiffy
> > to the iowait time
> [...]
> > 4) on SMP systems the iowait time can be overestimated, no big
> > deal IMHO but cheap suggestions for improvement are welcome
^^^^^
> This appears to be global across all cpu's. Maybe nr_iowait_tasks
> should be accounted on a per-cpu basis, where

While your proposal should work, somehow I doubt it's worth
the complexity. It's just a statistic to help sysadmins ;)

regards,

Rik

-- 
	http://www.linuxsymposium.org/2002/
"You're one of those condescending OLS attendants"
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http://www.surriel.com/		http://distro.conectiva.com/


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