Re: [PATCH v4 0/6] LoongArch: Add pv ipi support on LoongArch VM

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On 2024/2/22 下午5:34, WANG Xuerui wrote:
On 2/17/24 11:15, maobibo wrote:
On 2024/2/15 下午6:25, WANG Xuerui wrote:
On 2/15/24 18:11, WANG Xuerui wrote:
Sorry for the late reply (and Happy Chinese New Year), and thanks for providing microbenchmark numbers! But it seems the more comprehensive CoreMark results were omitted (that's also absent in v3)? While the

Of course the benchmark suite should be UnixBench instead of CoreMark. Lesson: don't multi-task code reviews, especially not after consuming beer -- a cup of coffee won't fully cancel the influence. ;-)

Where is rule about benchmark choices like UnixBench/Coremark for ipi improvement?

Sorry for the late reply. The rules are mostly unwritten, but in general you can think of the preference of benchmark suites as a matter of "effectiveness" -- the closer it's to some real workload in the wild, the better. Micro-benchmarks is okay for illustrating the points, but without demonstrating the impact on realistic workloads, a change could be "useless" in practice or even decrease various performance metrics (be that throughput or latency or anything that matters in the certain case), but get accepted without notice.
yes, micro-benchmark cannot represent the real world, however it does not mean that UnixBench/Coremark should be run. You need to point out what is the negative effective from code, or what is the possible real scenario which may benefit. And points out the reasonable benchmark sensitive for IPIs rather than blindly saying UnixBench/Coremark.

Bibo Mao

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