netdev - Re: Using HTB over MultiQ

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Date:	Thu, 07 Nov 2013 06:39:59 -0800
From:	John Fastabend <john.r.fastabend@...el.com>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	Anton 'EvilMan' Danilov <littlesmilingcloud@...il.com>
CC:	netdev@...r.kernel.org
Subject: Re: Using HTB over MultiQ

On 11/7/2013 6:20 AM, Eric Dumazet wrote:
> On Thu, 2013-11-07 at 06:11 -0800, Eric Dumazet wrote:
>> On Thu, 2013-11-07 at 17:12 +0400, Anton 'EvilMan' Danilov wrote:
>>> Hello.
>>>
>>> I'm experimenting with high performance linux router with 10G NICs.
>>> On high traffic rates the performance are limited by the lock of root
>>> queue discipline. For avoid impact of locking i've decided to build
>>> QoS scheme over the multiq qdisc.
>>>
>
> Oh well, this is a router.
>
> 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.
>


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.

Or another way would be use mqprio and steer packets to HTB classes
using the skb->priority. The priority can be set by iptables/nftables
or an ingress filter.

.John
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