netdev - Re: Using HTB over MultiQ

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Message-ID: <CAEzD07JwrnqeB35BiTC2ztpyei2KNDtYO8zuewicKNBwyxmOtQ@mail.gmail.com>
Date:	Fri, 8 Nov 2013 18:53:10 +0400
From:	"Anton 'EvilMan' Danilov" <littlesmilingcloud@...il.com>
To:	John Fastabend <john.r.fastabend@...el.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org
Subject: Re: Using HTB over MultiQ

Hello.

On 11/7/2013 6:20 AM, Eric Dumazet wrote:
>
> So I think you need to change the device queue selection so that it only
> depends on your filters / htb classes.
>
> Otherwise flows for a particular 'customer' might be spread on the 8
> queues, so the rate could be 8 * 1Mbit, instead of 1Mbit.

2013/11/7 John Fastabend <john.r.fastabend@...el.com>:
>
> With the multiq qdisc you could attach filter to the root qdisc and use
> skbedit to set the queue_mapping field,
>
> #tc filter add dev eth0 parent 1: protocol ip prio 1 u32 \
>         match ip dst 192.168.0.3 \
>         action skbedit queue_mapping 3
>
> if you configure the filters to map to the correct classes this would
> work.
>

I did as you adviced to me. I'm using the skbedit action with classify
filters for map the packet to assigned queue.
But i've got the another unexpected issue. u32 classifier of the root
multiq qdisc isn't setting the skb->priority value, and result of the
classifying is lost. For avoid this behaviour i'm setting priority by
the skbedit action.
After this all works as expected.
Unfortunately performance aren't improved.

Over 60 percent of 'perf top' is _raw_spin_lock function.
Speed of traffic is near 6Gbit/s, packet rate ~ 1.3 Mpps. But this
speed are limited by shaper.

Thanks for help.

-- 
Anton.
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