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Today I noticed that going from 2.6.6 to 2.6.7-rc1 caused a big drop in LMbench2 bw_pipe throughput on a dual-CPU machine (2.6.7-rc1 shows 10 times lower bandwidth than 2.6.6). It appears that the drop is due to the two tasks being distributed across the two CPUs, rather than being kept on the same CPU. If I force the tasks to be pinned on a single CPU, e.g., like so: $ taskset 1 ./bw_pipe then performance is "only" about 10% worse than with 2.6.6. Is this kind of drop expected? --david - 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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