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[Bug runtime/9822] reduce timer load
- From: "jistone at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 23 Feb 2009 23:29:23 -0000
- Subject: [Bug runtime/9822] reduce timer load
- References: <20090204222045.9822.fche@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From jistone at redhat dot com 2009-02-23 23:29 -------
(In reply to comment #1)
> > - the runtime/time.c timekeeping widgetry that uses jiffies to keep the
> > per-cpu khz estimates updated
>
> This ensures the accuracy of the self-own version of gettimeofday_*.
> - if the script doesn't use gettimeofday_*, just disable timer.
I just committed a change to this effect, so we should be in a lot better shape.
For an idle script that doesn't call gettimeofday, powertop tells me that I
went from 88.9% C3 residency to 97.1% (vs. 98.3% without stap).
Many of the other suggestions here are still valid, but I think this was the
biggest step.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=9822
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