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From: Vijay Subramanian <subramanian.vijay@gmail.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Dave Taht <dave.taht@gmail.com>,
	Hans Schillstrom <hans.schillstrom@ericsson.com>,
	netdev <netdev@vger.kernel.org>,
	Neal Cardwell <ncardwell@google.com>,
	Tom Herbert <therbert@google.com>,
	Jesper Dangaard Brouer <brouer@redhat.com>
Subject: Re: [PATCH net-next] tcp: avoid tx starvation by SYNACK packets
Date: Sat, 23 Jun 2012 00:34:53 -0700	[thread overview]
Message-ID: <CAGK4HS8Hae_4sNQeGXGc4ocK1-2DVtCUdBAPj7+DY_iF6-2zOA@mail.gmail.com> (raw)
In-Reply-To: <1338615992.2760.1665.camel@edumazet-glaptop>

On 1 June 2012 22:46, Eric Dumazet <eric.dumazet@gmail.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@gmail.com> wrote:
>> > From: Eric Dumazet <edumazet@google.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

  reply	other threads:[~2012-06-23  7:34 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-05-31 21:56 [PATCH net-next] tcp: avoid tx starvation by SYNACK packets Eric Dumazet
2012-05-31 23:03 ` David Miller
2012-06-01  4:48   ` Eric Dumazet
2012-06-01 17:46     ` David Miller
2012-06-01  7:00 ` [PATCH] tcp: do not create inetpeer on SYNACK message Eric Dumazet
2012-06-01 18:24   ` David Miller
2012-06-01 21:34   ` Hans Schillström
2012-06-02  6:56     ` Eric Dumazet
2012-06-01  7:36 ` [PATCH net-next] tcp: avoid tx starvation by SYNACK packets Hans Schillstrom
2012-06-01  9:34   ` Eric Dumazet
2012-06-02  1:28 ` Dave Taht
2012-06-02  5:46   ` Eric Dumazet
2012-06-23  7:34     ` Vijay Subramanian [this message]
2012-06-23  8:42       ` [PATCH v2 " Eric Dumazet
2012-06-25  6:24         ` Hans Schillstrom
2012-06-25 22:43         ` David Miller
2012-06-26  4:51           ` Eric Dumazet
2012-06-26  4:55             ` David Miller
2012-06-26  5:34               ` Hans Schillstrom
2012-06-26  7:11                 ` David Miller
2012-06-26  7:27                   ` Hans Schillstrom
2012-06-26 17:02                 ` Eric Dumazet
2012-06-27  5:23                   ` Hans Schillstrom
2012-06-27  8:22                     ` David Miller
2012-06-27  8:25                       ` Jesper Dangaard Brouer
2012-06-27  8:30                       ` Hans Schillstrom
2012-06-27  8:40                       ` Eric Dumazet
2012-06-27  8:48                         ` David Miller
2012-06-27  6:32                   ` Jesper Dangaard Brouer
2012-06-27  6:54                     ` David Miller
2012-06-27  7:24                       ` Jesper Dangaard Brouer
2012-06-27  7:30                         ` Eric Dumazet
2012-06-27  7:54                           ` Jesper Dangaard Brouer
2012-06-27  8:02                             ` Eric Dumazet
2012-06-27  8:21                               ` Jesper Dangaard Brouer
2012-06-27  8:45                                 ` Eric Dumazet
2012-06-27  9:23                                   ` Jesper Dangaard Brouer
2012-06-27  8:13                           ` David Miller
2012-06-27 19:50                       ` Florian Westphal
2012-06-27 21:39                         ` Eric Dumazet
2012-06-27 22:23                           ` David Miller
2012-06-27 22:23                         ` David Miller

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