Backport - xen-netback: correctly schedule rate-limited queues

Backport - xen-netback: correctly schedule rate-limited queues

[Jean-Louis Dupond]

Hi All,

Is there a chance the following patch 
(https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=dfa523ae9f2542bee4cddaea37b3be3e157f6e6b) 
can get backported to the current LTS kernels (including 4.9.x)?

The commit message might not be completely showing the impact of this 
issue (which is fixed with the patch).

Without the patch, ksoftirqd goes nuts if you upload on a domU with 
rate-limiting enabled.
This not only causing high cpu load, but sometimes also a complete hang 
of the hypervisor.

As the patch is quite important and trivial, I think it would be good to 
have it backported :)

Thanks
Jean-Louis

Re: Backport - xen-netback: correctly schedule rate-limited queues

[Jean-Louis Dupond]

Hi,

Any chance on this? As it gives a possible freeze on all Xen machines 
that use rate-limiting, I really think we should backport this straight 
forward patch.

Thanks
Jean-Louis


Op 11-07-17 om 11:47 schreef Jean-Louis Dupond:
> Hi All,
>
> Is there a chance the following patch 
> (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=dfa523ae9f2542bee4cddaea37b3be3e157f6e6b) 
> can get backported to the current LTS kernels (including 4.9.x)?
>
> The commit message might not be completely showing the impact of this 
> issue (which is fixed with the patch).
>
> Without the patch, ksoftirqd goes nuts if you upload on a domU with 
> rate-limiting enabled.
> This not only causing high cpu load, but sometimes also a complete 
> hang of the hypervisor.
>
> As the patch is quite important and trivial, I think it would be good 
> to have it backported :)
>
> Thanks
> Jean-Louis