netdev - Re: [Qemu-devel] [PATCH] net: add raw backend

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Message-ID: <20090721072546.GA16131@gondor.apana.org.au>
Date:	Tue, 21 Jul 2009 15:25:46 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Or Gerlitz <ogerlitz@...taire.com>
Cc:	Jamie Lokier <jamie@...reable.org>,
	Anthony Liguori <anthony@...emonkey.ws>, qemu-devel@...gnu.org,
	Jan Kiszka <jan.kiszka@....de>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Mark McLoughlin <markmc@...hat.com>,
	Dor Laor <dlaor@...hat.com>, netdev@...r.kernel.org
Subject: Re: [Qemu-devel] [PATCH] net: add raw backend  - some performance
	measurements

On Tue, Jul 21, 2009 at 10:03:00AM +0300, Or Gerlitz wrote:
> 
> okay, when setting net.bridge.bridge-nf-call-iptables to zero, the VM TX / tap+bridge packet rate climbs from 170K to 195K but it still way beyond the 240K rate achieved by the raw mode --> we have now a clear sign on the performance gain this approach provides. 

I find this hard to believe this bridge sans netfilter does a
single lookup based on the MAC address and then just passes the
packet to the underlying driver.

Can you do an oprofile run to see if something else is chewing
up CPU time under the guise of bridging?

Thanks,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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