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Groups > linux.debian.kernel > #68433

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

Cross-posted to 2 groups.

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On Thu, 2020-10-22 at 13:43 -0700, Flavio Veloso wrote:
> Package: linux-image-cloud-amd64
> Version: 4.19+105+deb10u7
> Severity: wishlist
> 
> Since cloud images are mostly run for server workloads in headless 
> environments accessed via network only, it would be better if 
> "linux-image-cloud-*" kernels were compiled with CONFIG_PREEMPT_NONE=y 
> ("No Forced Preemption (Server)").
> 
> Currently those packages use CONFIG_PREEMPT_VOLUNTARY=y ("Voluntary 
> Kernel Preemption (Desktop)")
> 
> CONFIG_PREEMPT_NONE description from kernel help:
[...]

I know what it says, but I think the notion that latency is less
important on servers is outdated.

It's well known that people give up quickly on web pages that are slow
to load:
<https://www.gigaspaces.com/blog/amazon-found-every-100ms-of-latency-cost-them-1-in-sales/>.
And a web page can depend on (indirectly) very many servers, which
means that e.g. high latency that only occurs 1% of the time on any
single server actually affects a large fraction of requests.

Ben.

-- 
Ben Hutchings
The world is coming to an end.	Please log off.

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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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