netdev - Re: SACK scoreboard

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Date:	Tue, 8 Jan 2008 17:34:03 -0800
From:	"Lachlan Andrew" <lachlan.andrew@...il.com>
To:	"David Miller" <davem@...emloft.net>
Cc:	jheffner@....edu, ilpo.jarvinen@...sinki.fi,
	netdev@...r.kernel.org, quetchen@...tech.edu
Subject: Re: SACK scoreboard

Greetings David,

On 08/01/2008, David Miller <davem@...emloft.net> wrote:
> From: John Heffner <jheffner@....edu>
>
> > I haven't thought about this too hard, but can we approximate this by
> > moving scaked data into a sacked queue, then if something bad happens
> > merge this back into the retransmit queue?
>
> That defeats the impetus for the change.
>
> We want to free up the data, say, 2 packets at a time as
> ACKs come in.  The key goal is smooth liberation of
> retransmit queue packets over time.

John also suggested freeing the packets as a lower priority task, just
doing it after they're acknowledged.

When the ACK finally comes, you could do something like moving John's
entire list of packets to a "to be freed" list, and free a few every
time (say) another ACK comes in.

$0.02,
Lachlan

-- 
Lachlan Andrew  Dept of Computer Science, Caltech
1200 E California Blvd, Mail Code 256-80, Pasadena CA 91125, USA
Ph: +1 (626) 395-8820    Fax: +1 (626) 568-3603
http://netlab.caltech.edu/~lachlan
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