Messages in this thread | | | Date | Thu, 19 May 2005 16:29:16 -0700 | From | Nishanth Aravamudan <> | Subject | Re: [RFC][PATCH 0/4] new timeofday-based soft-timer subsystem |
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On 17.05.2005 [16:33:00 -0700], Nishanth Aravamudan wrote: > On 13.05.2005 [17:16:35 -0700], john stultz wrote: > > All, > > This patch implements the architecture independent portion of the new > > time of day subsystem. For a brief description on the rework, see here: > > http://lwn.net/Articles/120850/ (Many thanks to the LWN team for that > > easy to understand writeup!) > > > > I intend this to be the last RFC release and to submit this patch to > > Andrew for for testing near the end of this month. So please, if you > > have any complaints, suggestions, or blocking issues, let me know. > > I have been working closely with John to re-work the soft-timer subsytem > to use the new timeofday() subsystem. The following patches attempts to > begin this process. I would greatly appreciate any comments.
<snip>
> I will try to get some current benchmark differentials posted tomorrow. > The previous patch I released showed little difference between mainline, > John's timeofday rework and my soft-timer rework in kernbench.
<snip>
Hrm, "tomorrow" became "two days from now," but here they are, kernbench comparisons (in percent relative to mainline) for x86 and x86_64, 10 iterations each.
The x86_64 machine is a 2-way 2.0 GHz with 3.5 GB of RAM. The x86 machine is 16-way (32 with HT) 1.4 GHz Xeon with 15 GB of RAM.
x86
Elapsed User System CPU
2.6.12-rc4: 100% 100% 100% 100%
2.6.12-rc4 + John's patch: 100.3% 100% 99.8% 99.6%
2.6.12-rc4 + John's patch + my patch: 102.1% 101% 100% 98%
x86_64
Elapsed User System CPU
2.6.12-rc4: 100% 100% 100% 100%
2.6.12-rc4 + John's patch: 99.5% 99.5% 99.1% 99.9%
2.6.12-rc4 + John's patch + my patch: 99.7% 99.7% 99.5% 100%
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All in all, pretty consistent across the board.
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