Re: has anyone tried adsl-optmizer kernel patches for dsl modems?

Linux Advanced Routing and Traffic Control

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Markus Schulz wrote:
On Wednesday 16 November 2005 16:03, Andy Furniss wrote:

sophana wrote:

Hi

I'm using wondershaper like script. But noticed imperfect
scheduling.

By googling, I found some patches that takes the aal5 atm overhead
in the scheduling algorithms.
http://www.adsl-optimizer.dk/ADSL-optimizer/

Before trying it, has anyone tried these patches? they apply on
2.4.29 kernel and 2.6.9 TC. I use centos4 with a 2.6 kernel, so I
can't try these easily.

They should be OK as long as you are sure about your overheads.

I use something similar and use ceil 286kbit while synced at 288kbit
without problems.

If your modem is connected by eth rather than ppp then htb/whatever
will see the packet size as ip len + 14 - so you need to account for
that.


can you explain this a bit more please?

It's because htb uses skb->len for packet size and if you shape on an eth interface this is ip length + 14, but it's just ip length if you shape on ppp/vlan etc.

You can see this by looking at htb counters and sending fixed size packets.



I think that produces a corner case (overhead < 14) where you would
need to put in a negative number - I don't think that will work, but
haven't tried.


should be easy to patch in. Overhead is only a simple variable which will be added in htb/* module for each paket. Only sign/unsign problem should be considered.

Yep - you just need to be aware of it and I can't recall it being mentioned in the thesis - I have only tested on 2.6 kernels.

Andy.
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