From: Martin Devera <devik@cdi.cz>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] SFQ + RED
Date: Tue, 04 Dec 2001 07:58:40 +0000 [thread overview]
Message-ID: <marc-lartc-100745259208833@msgid-missing> (raw)
In-Reply-To: <marc-lartc-100694050303443@msgid-missing>
IMHO the RED would be useful here. SFQ limits total packet count
to 128 packets. So that one flow can simply fill whole SFQ leaving
small space for other flows.
I'm able to simulate it using one host generating huge UDP flow.
All others flow goes away :(
devik
On Mon, 3 Dec 2001, Don Cohen wrote:
>
> > On Tue, Nov 27, 2001 at 11:53:10AM -0500, Michael T. Babcock wrote:
> > > I've asked this before, but does anyone feel technically inclined
> > > enough to try swapping in a RED queue for the per-bucket queuing done
> > > by SFQ? If SFQ builds a series of 'sessions' to be given fair use of
> > > available bandwidth, using RED to slow down those that are building up
> > > too fast would smooth things out.
>
> I don't think this is necessary. As it is now, when you enqueue a
> packet in a full SFQ queue it drops from the tail of the longest
> subqueue. If you have substantial competition for the link then
> your subqueue won't be allowed to grow very long to begin with.
> The random variation in demand from other flows will have the effect
> of jittering the maximum length of your subqueue, which is pretty
> similar to what you experience with RED, isn't it?
>
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>
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next prev parent reply other threads:[~2001-12-04 7:58 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-27 16:53 [LARTC] SFQ + RED Michael T. Babcock
2001-12-03 14:10 ` bert hubert
2001-12-03 21:05 ` Michael T. Babcock
2001-12-03 23:32 ` Don Cohen
2001-12-04 7:58 ` Martin Devera [this message]
2001-12-04 18:27 ` Michael T. Babcock
2001-12-06 16:23 ` bert hubert
2001-12-06 16:37 ` Michael T. Babcock
2001-12-06 18:12 ` bert hubert
2002-06-06 9:21 ` Jan Coppens
2002-06-06 11:38 ` Alexey Talikov
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