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

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Message-ID: <a8b4e68ed09513baa788427a0abd11f1@dupond.be>
Date:   Tue, 11 Jul 2017 11:47:12 +0200
From:   Jean-Louis Dupond <jean-louis@...ond.be>
To:     netdev@...r.kernel.org
Subject: Backport - xen-netback: correctly schedule rate-limited queues

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