Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt

Martin J. Bligh
2005-07-08T23:17:16Z

--On Friday, July 08, 2005 16:03:03 -0700 Chris Wedgwood <cw@f00f.org> wrote:

> On Fri, Jul 08, 2005 at 03:59:35PM -0700, Martin J. Bligh wrote:
>
>> I think we're talking between 2.6.12-git5 and 2.6.12-git6 right? I
>> can confirm more explicitly if really need be. 48s -> 45.5s elapsed.
>
> That's a huge difference (5%) --- what hardware is that on?

16 CPU x440 (about a 2-3 year old NUMA box). flat 4x seems about a 1%
gain, still statistically significant, but definitely smaller.

I'm not saying there isn't data supporting higher HZ ... I just haven't
seen it published. I get the feeling what people really want is high-res
timers anyway ... high HZ is just concealing the issue and making it
slightly less crap, not actually fixing it.

M.