Messages in this thread | | | From | "gis88530" <> | Subject | kernel benchmark | Date | Fri, 16 Mar 2001 10:52:27 +0800 |
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Hi,
I use kernprof+gprof to measure the 2.2.16 kernel, but the scale is mini-second. So I use do_gettimeofday( ) kernel function call to measure the latency. (This function support micro-second scale.)
Moreover, I use SmartBits packet generator to generate the specific network traffic load. The environment is as follows. However, the result are very funny. I think that latency should increase progressively when load increase, but the result are unable explaining. Could you give me some hint? Thanks a lot.
1518byte packet load latency(us) 1% 13.1284 10% 14.1629 20% 12.6558 30% 11.1056 40% 10.7510 50% 10.4148 60% 10.3337 70% 10.1038 80% 10.1103 90% 10.3634 100% 11.2367
64byte packet load latency(us) 1% 3.6767 10% 2.7696 20% 4.3926 30% 2.8135 40% 8.2552 50% 5.3088 60% 9.3744 70% 23.6247 80% 8.5351 90% 9.7217 100% 13.065
Benchmark Environment: +---smartbits<---+ | | +---->Linux-----+
* The do_gettimeofday function call is as follows: -------------- do_gettimeofday(&begin); ... (kernel do something) ... do_gettimeofday(&end); if (end.tv_usec < begin.tv_usec) { end.tv_usec += 1000000; end.tv_sec--; } end.tv_sedc -= begin.tv_sec; end.tv_usec -= begin.tv_usec; return ((end.tv_sec*1000000) + end.tv_usec);
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