On 10/18/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
It looks like I removed this when I eliminated the I/O wait percentage
calculations in Solaris 10. After taking a look at the SCCS history,
this looks like it was probably an overzealous code-deletion.
I'd say this is a bug, albeit a minor one. I have filed:
6483747 clock-tick processing should re-include threads waiting for I/O
Thanks for finding this.
As "meaningless" as iowait is/was, there was significant value once we
got beyond "the cpu is busy in iowait... add more boards!" Getting to
that point paid a couple of semesters of tuition for my salesman's
daughters.
Having one value as a quick gage of "is the storage keeping up with
the server" is very valuable in my environment - not everyone that
looks a performance stats is well-equipped to make use of them (see
tuition statement above). However, leaving these same people blind is
not a good approach either. We have long-term history of vmstat data
and would prefer to continue to use this as an indicator.
It sounds like the fix for this bug would be a kernel patch - is this correct?
Thank you very much for the quick analysis.
Mike
--
Mike Gerdts
http://mgerdts.blogspot.com/
_______________________________________________
perf-discuss mailing list
perf-discuss@opensolaris.org
