From: Phillip Susi <psusi@cfl.rr.com>
To: Jesper Dangaard Brouer <hawk@comx.dk>
Cc: Stephen Hemminger <shemminger@osdl.org>,
Jamal Hadi Salim <hadi@cyberus.ca>,
netdev@vger.kernel.org, lartc@mailman.ds9a.nl,
russell-tcatm@stuart.id.au, hawk@diku.dk,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/2] NET: Accurate packet scheduling for ATM/ADSL
Date: Wed, 14 Jun 2006 10:27:13 -0400 [thread overview]
Message-ID: <44901CC1.60403@cfl.rr.com> (raw)
In-Reply-To: <1150278004.26181.35.camel@localhost.localdomain>
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?
prev parent reply other threads:[~2006-06-14 14:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-14 9:40 [PATCH 0/2] NET: Accurate packet scheduling for ATM/ADSL Jesper Dangaard Brouer
2006-06-14 14:27 ` Phillip Susi [this message]
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