Re: AltQ + ng_iface
From: Daniel O'Connor (doconnor_at_gsoft.com.au)
Date: 07/29/05
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To: Julian Elischer <julian@elischer.org> Date: Fri, 29 Jul 2005 19:29:28 +0930
On Friday 29 July 2005 12:35, Julian Elischer wrote:
> I do this to great effect..
> consider:
> two sites connected by links in which teh bottleneck is 200KB/sec (1 E1?)
> when a lot of data is flowing from 1 to 2 then data from 2 to 1 is also
> slowed
> down because the acks have to go through the queues on ingress side of the
> bottleneck router.
>
> I add a dummynet entry on 1, limiting output to 190KB/sec, so that the
> queue is in dummynet and not the intermediate router, and then allow small
> ack packets
> to bypass that queue. As a result the data from 2 to 1 also flows at
> near capacity,
> and with a much lower latency. SInce data flows tend to be large packets,
> I sometimes actually prioitise ALL small packets allowing interactive
> stuff to
> bypass ftps etc. and sometimes I do it on both ends.
I am trying to do something similar, but for more interesting things like
games ;)
ie prioritise game traffic at the expense of normal bulk traffic.
The problem is that you have to specify fixed pipe bandwidths so I need to run
a script which reduces the size of the "everything else" pipe down to a level
where it doesn't cause much delay.
It would be nice if there was a way of elevating the priority of the outbound
game traffic above the bulk transfers - allegedly my ISP prioritises game and
VoIP traffic on the way in to me...
My previous set up did work OK, but it was pretty limiting in that I had to
really aggressively reduce non-game traffic bandwidth otherwise the game
would get fairly laggy.
I am using 512/128k ADSL with PPPoE, and for non-crappy game play I need to
limit incoming non-game traffic to 64kbit/sec and outgoing to 24kbit/sec.
-- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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