Bug#972709: Wishlist/RFC: Change to CONFIG_PREEMPT_NONE in linux-image-cloud-*

From	Ben Hutchings <ben@decadent.org.uk>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#972709: Wishlist/RFC: Change to CONFIG_PREEMPT_NONE in linux-image-cloud-*
Date	2020-11-22 23:40 +0100
Message-ID	<Be6bv-6q4-1@gated-at.bofh.it> (permalink)
References	<B2QjL-7oT-1@gated-at.bofh.it> <B3ged-64a-5@gated-at.bofh.it> <Be61P-6mT-5@gated-at.bofh.it> <B2QjL-7oT-1@gated-at.bofh.it> <Be61P-6mT-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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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.

Thread

Bug#972709: Wishlist/RFC: Change to CONFIG_PREEMPT_NONE in linux-image-cloud-* Flavio Veloso <flaviovs@magnux.com> - 2020-10-22 23:30 +0200
  Bug#972709: Wishlist/RFC: Change to CONFIG_PREEMPT_NONE in linux-image-cloud-* Ben Hutchings <ben@decadent.org.uk> - 2020-10-24 03:10 +0200
    Bug#972709: Wishlist/RFC: Change to CONFIG_PREEMPT_NONE in linux-image-cloud-* Flavio Veloso Soares <flaviovs@magnux.com> - 2020-11-22 23:30 +0100
      Bug#972709: Wishlist/RFC: Change to CONFIG_PREEMPT_NONE in linux-image-cloud-* Ben Hutchings <ben@decadent.org.uk> - 2020-11-22 23:40 +0100
        Bug#972709: Wishlist/RFC: Change to CONFIG_PREEMPT_NONE in linux-image-cloud-* Flavio Veloso Soares <flaviovs@magnux.com> - 2020-11-23 01:00 +0100
          Bug#972709: Wishlist/RFC: Change to CONFIG_PREEMPT_NONE in linux-image-cloud-* Noah Meyerhans <noahm@debian.org> - 2020-11-23 03:00 +0100
            Bug#972709: Wishlist/RFC: Change to CONFIG_PREEMPT_NONE in linux-image-cloud-* Flavio Veloso Soares <flaviovs@magnux.com> - 2020-11-25 09:20 +0100

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