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

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On 2020-11-22 2:28 p.m., Ben Hutchings wrote:
> 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.
>
> [...]

"Services" is a too broad term. Which kind of service are you talking about?

For the record, I'm talking about latency of kernel system calls 
specifically, which happens to be what CONFIG_PREEMPT* controls.


>> 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.
>
Are those benchmarks public? Can you provide links to them?


-- 
FVS

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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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