Re: [PATCH REPOST 1/2] NET: Accurate packet scheduling for ATM/ADSL (kernel)

[jamal <hadi@cyberus.ca>]

On Tue, 2006-17-10 at 09:34 +1000, Russell Stuart wrote:
> The Linux traffic's control engine inaccurately calculates
> transmission times for packets sent over ADSL links.  For
> some packet sizes the error rises to over 50%.  This occurs
> because ADSL uses ATM as its link layer transport, and ATM
> transmits packets in fixed sized 53 byte cells.
> 
> This changes the kernel rate table lookup, to be able to lookup
> packet transmission times over all ATM links, including ADSL,
> with perfect accuracy. The accuracy is dependent on the rate
> table that is calculated in userspace by iproute2 command tc.
> 
> A longer presentation of the patch, its rational, what it
> does and how to use it can be found here:
>    http://www.stuart.id.au/russell/files/tc/tc-atm/
> 
> A earlier version of the patch, and a _detailed_ empirical
> investigation of its effects can be found here:
>    http://www.adsl-optimizer.dk/
> 
> Signed-off-by: Jesper Dangaard Brouer <hawk@comx.dk>
> Signed-off-by: Russell Stuart <russell-tcatm@stuart.id.au>

ACKed-by: Jamal Hadi Salim

When Patrick has his patch ready after this goes in we can revisit.

cheers,
jamal