netdev - [PATCH 0/5] tcp: ipv4 listen state scaling

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Message-ID: <AANLkTikmNCogLY3ZVhtfxOnSpWdPMq1YBCM3ZprkxEsP@mail.gmail.com>
Date:	Wed, 27 Oct 2010 17:23:24 +0400
From:	Dmitry Popov <dp@...hloadlab.com>
To:	"David S. Miller" <davem@...emloft.net>,
	William.Allen.Simpson@...il.com,
	Eric Dumazet <eric.dumazet@...il.com>,
	Andreas Petlund <apetlund@...ula.no>,
	Shan Wei <shanwei@...fujitsu.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Octavian Purdila <opurdila@...acom.com>,
	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Evgeniy Polyakov <zbr@...emap.net>,
	Laurent Chavey <chavey@...gle.com>,
	Gilad Ben-Yossef <gilad@...efidence.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	"Steven J. Magnani" <steve@...idescorp.com>,
	Joe Perches <joe@...ches.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Yony Amit <yony@...sleep.com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH 0/5] tcp: ipv4 listen state scaling

*Note: this patch depends on "[PATCH] tcp: md5 signature check scaling"*
Hi.

The problem with current TCP stack implementation is that it locks
socket in tcp_v4_rcv on each incoming packet. However, incoming SYNs
may be processed in parallel with syncookies. And it helps a lot under
synflood. This proposed patch serie fixes this problem, but (as for
now) for ipv4 only.
6-core Xeon with 6 RX queues on NIC:
without patch: 530k syn-pkts/s;
with patch: 1620k syn-pkts/s.

Discussion?
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