On Sun, 2020-11-22 at 13:45 -0800, Flavio Veloso Soares wrote: > [Resending: just noticed that the reply I sent on Oct 23 didn't include > b.d.o] > > I don't think the article is about the same thing we're talking here. > CONFIG_PREEMPT* options control the compromise between latency and > throughput of *system calls* and *scheduling of CPU cycles spent in > kernel mode*, not network traffic.
The latency of requests to services on a server is affected by both scheduler and network latency. [...] > Unfortunately, I couldn't find many comprehensive benchmarks of kernel > CONFIG_PREEMPT* options. The one at > https://www.codeblueprint.co.uk/2019/12/23/linux-preemption-latency-throughput.html > > seems to be very thorough, [...] Not particularly. I'm used to latency benchmarks showing e.g. average, 90th percentile, 99th percentile, as well as worst. Ben. -- Ben Hutchings If at first you don't succeed, you're doing about average.
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