netdev - Re: HTB accuracy for high speed

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Message-ID: <20090521074400.GA19113@francoudi.com>
Date:	Thu, 21 May 2009 10:44:00 +0300
From:	Vladimir Ivashchenko <hazard@...ncoudi.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Eric Dumazet <dada1@...mosbay.com>, netdev@...r.kernel.org,
	kaber@...sh.net, davem@...emloft.net, devik@....cz,
	Antonio Almeida <vexwek@...il.com>,
	Corey Hickey <bugfood-ml@...ooh.org>
Subject: Re: HTB accuracy for high speed

> I don't know why more of esfq wasn't merged, anyway similar
> functionality could be achieved in current kernels with sch_drr +
> 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.

> 
> Jarek P.
> 
> PS: I guess, you wasn't very consistent if your main problem was
> exceeding or not reaching htb rate, and there is quite a difference.

Yes indeed :(

I'm trying to migrate from 2.6.21 eth/htb/esfq to 2.6.29 
bond/htb/sfq, and that introduces a lot of changes.

Apparently during some point I changed sfq divisor from 1024 
to 2048 and forgot about it.

Now I realize that the problems I reported were as follows:

1) HTB exceeds target when I use HTB + sfq + divisor 1024
2) HFSC exceeds target when I use HFSC + sfq + divisor 1024
3) HTB does not reach target when I use HTB + sfq + divisor 2048

I will check again scenario 1) with the latest patches from
the list.

> Vladimir Ivashchenko wrote, On 05/08/2009 10:46 PM:
> 
> > Exporting HZ=1000 doesn't help. However, even if I recompile the kernel
> > to 1000 Hz and the burst is calculated correctly, for some reason HTB on
> > 2.6.29 is still worse at rate control than 2.6.21.
> > 
> > With 2.6.21, ceil of 775 mbits, burst 99425b -> actual rate 825 mbits.
> > With 2.6.29, same ceil/burst -> actual rate 890 mbits.
> ...
> 
> Vladimir Ivashchenko wrote, On 05/17/2009 10:29 PM:
> 
> > Hi Antonio,
> > 
> > FYI, these are exactly the same problems I get in real life.
> > Check the later posts in "bond + tc regression" thread.
> ...

-- 
Best Regards
Vladimir Ivashchenko
Chief Technology Officer
PrimeTel, Cyprus - www.prime-tel.com
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