From: Hans Schillstrom <hans.schillstrom@ericsson.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: 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: Fri, 1 Jun 2012 09:36:12 +0200 [thread overview]
Message-ID: <201206010939.22620.hans.schillstrom@ericsson.com> (raw)
In-Reply-To: <1338501397.2760.1395.camel@edumazet-glaptop>
On Thursday 31 May 2012 23:56:37 Eric Dumazet 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.
>
Thanks Eric,
the patch is in under test now.
--
Regards
Hans Schillstrom
next prev parent reply other threads:[~2012-06-01 7:39 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 ` Hans Schillstrom [this message]
2012-06-01 9:34 ` [PATCH net-next] tcp: avoid tx starvation by SYNACK packets Eric Dumazet
2012-06-02 1:28 ` Dave Taht
2012-06-02 5:46 ` Eric Dumazet
2012-06-23 7:34 ` Vijay Subramanian
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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