Re: [PATCH 0/2] NET: Accurate packet scheduling for ATM/ADSL

[Phillip Susi]

Jesper Dangaard Brouer 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.

I could have sworn that DSL uses its own framing protocol that is 
similar to the frame/superframe structure of HDSL ( T1 ) lines and over 
that you can run ATM or ethernet.  Or is it typically ethernet -> ATM -> 
HDSL?

In any case, why does the kernel care about the exact time that the IP 
packet has been received and reassembled on the headend?


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/