Messages in this thread | | | Date | Fri, 17 May 2002 19:21:16 +0530 | From | Dipankar Sarma <> | Subject | 16-CPU #s for lockfree rtcache (rt_rcu) |
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As promised, here is the kernprof data from the simulated test suggested by Dave. The test uses 32 processes and dest addresses for rtcache lookup are random, changing after every 5 packets. The measurements were done in a 16 CPU NUMA-Q.
2.5.3 : ip_route_output_key [c01bab8c]: 12166 2.5.3+rt_rcu : ip_route_output_key [c01bb084]: 6027
I have seen moderately significant profile counts for ip_route_input() in preliminary webserver benchmark runs. It is not however clear to me that bucket lock cache line bouncing is the reason behind it. That one needs more investigation.
Thanks -- Dipankar Sarma <dipankar@in.ibm.com> http://lse.sourceforge.net Linux Technology Center, IBM Software Lab, Bangalore, India. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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