OpenWRT wrong adjustment of fq_codel defaults (Was: [Codel] fq_codel_drop vs a udp flood)

[Kevin Darbyshire-Bryant]

On 06/05/16 10:42, Jesper Dangaard Brouer wrote:
> Hi Felix,
>
> This is an important fix for OpenWRT, please read!
>
> OpenWRT changed the default fq_codel sch->limit from 10240 to 1024,
> without also adjusting q->flows_cnt.  Eric explains below that you must
> also adjust the buckets (q->flows_cnt) for this not to break. (Just
> adjust it to 128)
>
> Problematic OpenWRT commit in question:
>  http://git.openwrt.org/?p=openwrt.git;a=patch;h=12cd6578084e
>  12cd6578084e ("kernel: revert fq_codel quantum override to prevent it from causing too much cpu load with higher speed (#21326)")
I 'pull requested' this to the lede-staging tree on github.
https://github.com/lede-project/staging/pull/11

One way or another Felix & co should see the change :-)
>
>
> I also highly recommend you cherry-pick this very recent commit:
>  net-next: 9d18562a2278 ("fq_codel: add batch ability to fq_codel_drop()")
>  https://git.kernel.org/davem/net-next/c/9d18562a227
>
> This should fix very high CPU usage in-case fq_codel goes into drop mode.
> The problem is that drop mode was considered rare, and implementation
> wise it was chosen to be more expensive (to save cycles on normal mode).
> Unfortunately is it easy to trigger with an UDP flood. Drop mode is
> especially expensive for smaller devices, as it scans a 4K big array,
> thus 64 cache misses for small devices!
>
> The fix is to allow drop-mode to bulk-drop more packets when entering
> drop-mode (default 64 bulk drop).  That way we don't suddenly
> experience a significantly higher processing cost per packet, but
> instead can amortize this.
I haven't done the above cherry-pick patch & backport patch creation for
4.4/4.1/3.18 yet - maybe if $dayjob permits time and no one else beats
me to it :-)

Kevin

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