From: Eric Dumazet <eric.dumazet@gmail.com>
To: "John A. Sullivan III" <jsullivan@opensourcedevel.com>
Cc: netdev@vger.kernel.org
Subject: Re: Shaping TCP ACK packets
Date: Tue, 06 Dec 2011 06:59:26 +0100 [thread overview]
Message-ID: <1323151166.2467.11.camel@edumazet-laptop> (raw)
In-Reply-To: <7cf7b0f6-b30f-465a-9e50-20bd2c31bbe9@jasiiieee>
Le lundi 05 décembre 2011 à 23:18 -0500, John A. Sullivan III a écrit :
> Hello, all. I've seen several sites recommend prioritizing TCP ACK
> packets using tc. Is that a good idea? I have two reservations:
>
> 1) If my line is congested, isn't delaying ACKs a good way to slow
> down the conversation? Accelerating ACKs under congestion sounds a bit
> like stuffing more food in my mouth when I'm already choking.
>
It depends which way is congested. Sites recommends prioritizing ACKS on
the up way, because most of the time ADSL links are assymetric. an
uplink is congested.
> 2) By messing with normal coordination of TCP, do I risk making a
> mess. Specifically, can I create problems with out of order packet
> delivery - send an ACK before the packet which should have preceded
> it? I suppose in a well behaved protocol that wouldn't happen but I'm
> not sure. Thanks - John
> --
Well, if you prioritize true acks (packets with no payload), there is no
reorder problem per se.
prev parent reply other threads:[~2011-12-06 5:59 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <b7c7ae97-0030-4397-a1e3-ec29babdff4d@jasiiieee>
2011-12-06 4:18 ` Shaping TCP ACK packets John A. Sullivan III
2011-12-06 5:59 ` Eric Dumazet [this message]
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