netdev - Re: htb parallelism on multi-core platforms

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Date:	Thu, 23 Apr 2009 20:43:19 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Radu Rendec <radu.rendec@...s.ro>
Cc:	Jesper Dangaard Brouer <hawk@...u.dk>,
	Denys Fedoryschenko <denys@...p.net.lb>, netdev@...r.kernel.org
Subject: Re: htb parallelism on multi-core platforms

Radu Rendec wrote, On 04/23/2009 02:31 PM:

> On Wed, 2009-04-22 at 23:29 +0200, Jesper Dangaard Brouer wrote:
...
>> The HTB classify hash has a scalability issue in kernels below 2.6.26. 
>> Patrick McHardy fixes that up in 2.6.26.  What kernel version are you 
>> using?
> 
> I'm using 2.6.26, so I guess the fix is already there :(

If Jesper meant the change of hash I can see it in 2.6.27 yet.

...
> In conclusion each packet would be matched against at most 1026 rules
> (worst case). The real case is actually much better: only one bucket
> with 400 rules, all other less than 70 rules and most of them less than
> 10 rules.

Alas I can't analyze this all now, and probably I miss something, but
your worst and real cases look suspiciously big. Do all these classes
differ so much? Maybe you should have a look at cls_flow?

Jarek P.
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