From: Andi Kleen <andi@firstfloor.org>
To: Vernon Mauery <vernux@us.ibm.com>
Cc: Eilon Greenstein <eilong@broadcom.com>,
Andi Kleen <andi@firstfloor.org>, netdev <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
rt-users <linux-rt-users@vger.kernel.org>
Subject: Re: High contention on the sk_buff_head.lock
Date: Wed, 18 Mar 2009 22:59:01 +0100 [thread overview]
Message-ID: <20090318215901.GV11935@one.firstfloor.org> (raw)
In-Reply-To: <49C16CD4.3010708@us.ibm.com>
> Thanks. I will test to see how this affects this lock contention the
> next time the broadcom hardware is available.
The other strategy to reduce lock contention here is to use TSO/GSO/USO.
With that the lock has to be taken less often because there are less packets
travelling down the stack. I'm not sure how well that works with netperf style
workloads though. Using multiple TX queues is probably better though if you have
capable hardware. Or ideally both.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2009-03-18 21:59 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-18 17:24 High contention on the sk_buff_head.lock Vernon Mauery
2009-03-18 19:07 ` Eric Dumazet
2009-03-18 20:17 ` Vernon Mauery
2009-03-20 23:29 ` Jarek Poplawski
2009-03-23 8:32 ` Eric Dumazet
2009-03-23 8:37 ` David Miller
2009-03-23 8:50 ` Jarek Poplawski
2009-04-02 14:13 ` Herbert Xu
2009-04-02 14:15 ` Herbert Xu
2009-03-18 20:54 ` Andi Kleen
2009-03-18 21:03 ` David Miller
2009-03-18 21:10 ` Vernon Mauery
2009-03-18 21:38 ` David Miller
2009-03-18 21:49 ` Vernon Mauery
2009-03-19 1:02 ` David Miller
2009-03-18 21:54 ` Gregory Haskins
2009-03-19 1:03 ` David Miller
2009-03-19 1:13 ` Sven-Thorsten Dietrich
2009-03-19 1:17 ` David Miller
2009-03-19 1:43 ` Sven-Thorsten Dietrich
2009-03-19 1:54 ` David Miller
2009-03-19 5:49 ` Eric Dumazet
2009-03-19 5:58 ` David Miller
2009-03-19 14:04 ` [PATCH] net: reorder struct Qdisc for better SMP performance Eric Dumazet
2009-03-20 8:33 ` David Miller
2009-03-19 13:45 ` High contention on the sk_buff_head.lock Andi Kleen
2009-03-19 3:48 ` Gregory Haskins
2009-03-19 5:38 ` David Miller
2009-03-19 12:42 ` Gregory Haskins
2009-03-19 20:52 ` David Miller
2009-03-19 12:50 ` Peter W. Morreale
2009-03-19 7:15 ` Evgeniy Polyakov
2009-03-18 21:07 ` Vernon Mauery
2009-03-18 21:45 ` Eilon Greenstein
2009-03-18 21:51 ` Vernon Mauery
2009-03-18 21:59 ` Andi Kleen [this message]
2009-03-18 22:19 ` Rick Jones
2009-03-19 12:59 ` Peter W. Morreale
2009-03-19 13:36 ` Peter W. Morreale
2009-03-19 13:46 ` Andi Kleen
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