netdev - Re: [PATCH net-next] tcp: avoid tx starvation by SYNACK packets

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Message-ID: <CAGK4HS8Hae_4sNQeGXGc4ocK1-2DVtCUdBAPj7+DY_iF6-2zOA@mail.gmail.com>
Date:	Sat, 23 Jun 2012 00:34:53 -0700
From:	Vijay Subramanian <subramanian.vijay@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Dave Taht <dave.taht@...il.com>,
	Hans Schillstrom <hans.schillstrom@...csson.com>,
	netdev <netdev@...r.kernel.org>,
	Neal Cardwell <ncardwell@...gle.com>,
	Tom Herbert <therbert@...gle.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: [PATCH net-next] tcp: avoid tx starvation by SYNACK packets

On 1 June 2012 22:46, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Fri, 2012-06-01 at 18:28 -0700, Dave Taht wrote:
>> On Thu, May 31, 2012 at 2:56 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>> > From: Eric Dumazet <edumazet@...gle.com>
>> >
>> > pfifo_fast being the default Qdisc, its pretty easy to fill it with
>> > SYNACK (small) packets while host is under SYNFLOOD attack.
>> >
>> > Packets of established TCP sessions are dropped and host appears almost
>> > dead.
>> >
>> > Avoid this problem assigning TC_PRIO_FILLER priority to SYNACK
>> > generated in SYNCOOKIE mode, so that these packets are enqueued into
>> > pfifo_fast band 2.
>> >
>> > Other packets, queued to band 0 or 1 are dequeued before any SYNACK
>> > packets waiting in band 2.
>>

This  patch ([PATCH net-next] tcp: avoid tx starvation by SYNACK
packets)  is neither in net/net-next trees nor on patchwork. Maybe it
was missed since it was sent during the merge window. Is this not
needed anymore or is it being tested currently?

Thanks,
Vijay
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