Messages in this thread | | | Date | Mon, 30 Apr 2012 09:54:47 -0700 | From | Rick Jones <> | Subject | Re: getting host CPU utilization (was Re: [PATCH V7 2/4 net-next] skbuff: Add userspace zero-copy buffers in skb) |
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On 04/30/2012 02:12 AM, Michael S. Tsirkin wrote: > On Tue, Jun 28, 2011 at 10:19:48AM -0700, Rick Jones wrote: >> one of these days I'll have to find a good way to get accurate >> overall CPU utilization from within a guest and teach netperf about >> it. > > I think the cleanest way would be to run another netperf server on the > host. netperf would get a flag with host address and get cpu > utilization info. > > This is what we currently do manually: run mpstat on the host. > > Thoughts?
I might be able to enhance the LOC_CPU/REM_CPU calibration tests to be bona fide CPU utilization tests.
> By the way, could you point me to code used by netperf > to measure CPU utilization on Linux? I'd like to figure > out why isn't the result always consistent with e.g. mpstat.
That would be src/netcpu_procstat.c . That code is automagically selected by the configure script when it determines the compilation is happening under Linux. You can, if you wish, manually set it though I suspect the only other mechanism known to netperf that would function under Linux is the "looper" (aka CPU soaker) method.
rick
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