netdev - Re: HTB accuracy for high speed (and bonding)

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Message-Id: <1243075052.27210.22.camel@hazard2.francoudi.com>
Date:	Sat, 23 May 2009 13:37:32 +0300
From:	Vladimir Ivashchenko <hazard@...ncoudi.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Eric Dumazet <dada1@...mosbay.com>, netdev@...r.kernel.org
Subject: Re: HTB accuracy for high speed (and bonding)


> > > cls_flow, alas not enough documented. Here is some hint:
> > > http://markmail.org/message/h24627xkrxyqxn4k
> > 
> > Can I balance only by destination IP using this approach? 
> > Normal IP flow-based balancing is not good for me, I need 
> > to ensure equality between destination hosts.
> 
> Yes, you need to use flow "dst" key, I guess. (tc filter add flow
> help)

What is the number of DRR classes I need to create, a separate class for
each host? I have around 20000 hosts.

I figured out that WRR does what I want and its documented, so I'm using
a 2.6.27 kernel with WRR now.

I was still hitting a wall with bonding. I played with a lot of
combinations and could not find a way to make it scale to multiple
cores. Cores which handle incoming traffic would get hit to 0-20% idle.

So, I got rid of bonding completely and instead configured PBR on Cisco
+ Linux routing in such a way so that packet gets received and
transmitted using NICs connected to the same pair of cores with common
cache. 65-70% idle on all cores now, compared to 0-30% idle in worst
case scenarios before.

> - gso/tso or other non standard packets sizes - for exceeding the
>   rate.

Just FYI, kernel 2.6.29.1, sub-classes with sfq divisor 1024, tso & gso
off, netdevice.h and tc_core.c patches applied:

class htb 1:2 root rate 775000Kbit ceil 775000Kbit burst 98328b cburst
98328b
Sent 64883444467 bytes 72261124 pkt (dropped 0, overlimits 0 requeues 0)
rate 821332Kbit 112572pps backlog 0b 0p requeues 0
lended: 21736738 borrowed: 0 giants: 0

In any case, exceeding the rate is not big of a problem for me.

Thanks a lot to everyone for their help.

-- 
Best Regards,
Vladimir Ivashchenko
Chief Technology Officer
PrimeTel PLC, Cyprus - www.prime-tel.com
Tel: +357 25 100100 Fax: +357 2210 2211


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