From: Stephen Hemminger <shemminger@linux-foundation.org>
To: Rick Jones <rick.jones2@hp.com>
Cc: kalyan tejaswi <kalyanatejaswi@gmail.com>, netdev@vger.kernel.org
Subject: Re: degradation in bridging performance of 5% in 2.6.20 when compared to 2.6.19
Date: Fri, 16 Feb 2007 10:32:52 -0800 [thread overview]
Message-ID: <20070216103252.58289213@freekitty> (raw)
In-Reply-To: <45D5ED38.1070503@hp.com>
On Fri, 16 Feb 2007 09:43:20 -0800
Rick Jones <rick.jones2@hp.com> wrote:
> kalyan tejaswi wrote:
> > Hi all,
> > I have been comparing bridging performance for 2.6.20 and 2.6.19
> > kernels. The kenel configurations are identical for both the kernels.
> > I use D-Link cards (8139too driver) for the Malta 4Kc board.
> >
> > The setup is:
> >
> > netperf client <-------> malta 4Kc <---------> netperf server.
> >
> > The throughput statistics (in 10^6 bits/second) are:
> >
> > 2.6.19 2.6.20
> > routing 30.2 30.16
> > bridging 32.35 30.81
> >
> > I observe that there has been a degradation in bridging performance of
> > 5% in 2.6.20 when compared to 2.6.19.
> >
> > Has anyone observed similar behaviour?
> > Any inputs or suggestions are welcome.
>
> In each case is the malta CPU bound? If not, some idea of the change in
> CPU util might be helpful.
>
> rick jones
> btw, netperf 2.4.3 just released:
> ftp://ftp.netperf.org/netperf
> http://www.netperf.org/svn/netperf2/tags/netperf-2.4.3
> -
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I couldn't think of a worse NIC for bridging than the 8139too
because that card has no direct DMA and does a data copy for each receive.
--
Stephen Hemminger <shemminger@linux-foundation.org>
prev parent reply other threads:[~2007-02-16 18:32 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-16 6:26 degradation in bridging performance of 5% in 2.6.20 when compared to 2.6.19 kalyan tejaswi
2007-02-16 17:43 ` Rick Jones
2007-02-16 18:32 ` Stephen Hemminger [this message]
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