netdev - Re: [NET_SCHED 00/04]: External SFQ classifiers/flow classifier

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Date:	Wed, 02 Apr 2008 12:42:49 +0100
From:	Andy Furniss <lists@...yfurniss.entadsl.com>
To:	lists@...yfurniss.entadsl.com
CC:	Patrick McHardy <kaber@...sh.net>,
	Corey Hickey <bugfood-ml@...ooh.org>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [NET_SCHED 00/04]: External SFQ classifiers/flow classifier

Andy Furniss wrote:

> It's cool being able to see the sfq flows.

It's also interesting to notice that allot varies so much.

I have seen +/- 10 * my quantum which I didn't expect, I wonder if it 
needs to be cleared when a flow empties or something.

The source for sfq is a bit hard to follow so I don't really know what's 
happening. I was dropping with limit of 40 (about a second at my rate) 
and had quite a few connections active, hashing on dst.

tcpdump also shows that single flows are getting 3/4/5 packets dequeued 
in a row when there are other flows active.

I guess it's hard to tell the state at any one instant when dropping and 
making flows dis/reappear but it does seem to behave in a way that 
amplifies burstyness.

My quantum = mtu + 14 and there are no giants.

Andy.
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