[Codel] fq_codel_drop vs a udp flood

Tue May 3 10:54:59 PDT 2016

On Tue, 2016-05-03 at 10:37 -0700, Dave Taht wrote:
> Thus far this batch drop patch is testing out beautifully. Under a
> 900Mbit flood going into 100Mbit on the pcengines apu2,  cpu usage for
> ksoftirqd now doesn't crack 10%, where before (under
> pie,pfifo,fq_codel,cake & the prior fq_codel) it went to 88% and
> ultimately bad things happened, like losing routability.
> 
> I've had it running for hours and I hardly notice it's there.
> 

Excellent, thanks for testing it.

> Performance for the normal cc controlled and/or sparse flows is
> unaffected, aside from the uncontrolled flows eating their percentage
> of the link.
> 
> Nice work. Thx. This should go into -stable.
> 
> https://patchwork.ozlabs.org/patch/617307/
> 
> Sigh. The RFC is past last call...

It is merged :

https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=9d18562a227874289fda8ca5d117d8f503f1dcca