Messages in this thread | | | Date | Sun, 13 Apr 2008 15:02:45 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 2/3] x86: Implement prctl PR_GET_TSC and PR_SET_TSC |
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Erik Bosman wrote: > > It took me a while, but I have done some tests om my system with and > without my patch applied. > > All deamons but klogd/syslogd were shut down andI used the following > command: > > LMBENCH_SCHED="SINGLE" \ > /usr/lib/lmbench/bin/{i686-pc,x86_64}-linux-gnu/lat_ctx -s 0 2 > > The variation was quite high so I ran it a 1000 times for each > configuration. > > x86_32, patch applied, 1000x repeated, avg: 1.319, rmse: 0.081 > x86_32, patch not applied, 1000x repeated, avg: 1.335, rmse: 0.107 > > x86_64, patch applied, 1000x repeated, avg: 1.417, rmse: 0.0716 > x86_64, patch not applied, 1000x repeated, avg: 1.423, rmse: 0.0745 > > This is on a core 2 duo E6300. >
OK, so it sounds like there is no measurable difference. Good.
-hpa
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