Bug#972709: Wishlist/RFC: Change to CONFIG_PREEMPT_NONE in linux-image-cloud-*
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important on servers is outdated.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
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