From: Andi Kleen <andi@firstfloor.org>
To: Tom Herbert <therbert@google.com>
Cc: David Miller <davem@davemloft.net>,
yanmin_zhang@linux.intel.com, bhutchings@solarflare.com,
andi@firstfloor.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, herbert@gondor.apana.org.au,
jesse.brandeburg@intel.com, shemminger@vyatta.com
Subject: Re: [RFC v2: Patch 1/3] net: hand off skb list to other cpu to submit to upper layer
Date: Sat, 14 Mar 2009 02:53:40 +0100 [thread overview]
Message-ID: <20090314015340.GM11935@one.firstfloor.org> (raw)
In-Reply-To: <65634d660903131724s49009177pdc11005aa76a4b56@mail.gmail.com>
> Yes, we are using a 10G NIC that supports multi-queue. The number of
> RX queues supported is half the number of cores on our platform, so
> that is going to limit the parallelism. With multi-queue turned on we
The standard wisdom is that you don't necessarily need to transmit
to each core, but rather to each shared mid or least level cache.
Once the data is cache hot (or cache near) distributing it further
in software is comparable cheap.
So this means you don't necessarily need as many queues as cores,
but more as many as big caches.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2009-03-14 1:53 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-11 8:53 [RFC v2: Patch 1/3] net: hand off skb list to other cpu to submit to upper layer Zhang, Yanmin
2009-03-11 11:13 ` Andi Kleen
2009-03-12 8:16 ` Zhang, Yanmin
2009-03-12 14:08 ` Ben Hutchings
2009-03-13 6:43 ` Zhang, Yanmin
2009-03-13 17:06 ` Tom Herbert
2009-03-13 18:51 ` David Miller
2009-03-13 21:01 ` Tom Herbert
2009-03-13 22:10 ` Ben Hutchings
2009-03-13 22:15 ` Stephen Hemminger
[not found] ` <65634d660903131358h765bef64y6a0f1b0db7400f6f@mail.gmail.com>
2009-03-13 21:02 ` David Miller
2009-03-13 21:59 ` Tom Herbert
2009-03-13 22:19 ` David Miller
2009-03-13 23:58 ` Herbert Xu
2009-03-14 0:24 ` Tom Herbert
2009-03-14 1:53 ` Andi Kleen [this message]
2009-03-14 2:19 ` David Miller
2009-03-14 13:19 ` Herbert Xu
2009-03-14 18:15 ` Tom Herbert
2009-03-14 18:45 ` David Miller
2009-03-16 16:53 ` Tom Herbert
2009-03-14 1:51 ` Andi Kleen
2009-03-16 3:20 ` Zhang, Yanmin
2009-03-12 14:34 ` Andi Kleen
2009-03-13 9:06 ` Zhang, Yanmin
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