From: Stephen Hemminger <shemminger@osdl.org>
To: Matt Leininger <mlleinin@hpcn.ca.sandia.gov>
Cc: Shirley Ma <xma@us.ibm.com>,
netdev@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
openib-general@openib.org,
"David S. Miller" <davem@davemloft.net>,
mst@mellanox.co.il
Subject: Re: [openib-general] Re: TSO and IPoIB performance degradation
Date: Tue, 7 Mar 2006 13:49:07 -0800 [thread overview]
Message-ID: <20060307134907.733d3d27@localhost.localdomain> (raw)
In-Reply-To: <1141767891.6119.903.camel@localhost>
On Tue, 07 Mar 2006 13:44:51 -0800
Matt Leininger <mlleinin@hpcn.ca.sandia.gov> wrote:
> On Mon, 2006-03-06 at 19:13 -0800, Shirley Ma wrote:
> >
> > > More likely you are getting hit by the fact that TSO prevents the
> > congestion
> > window from increasing properly. This was fixed in 2.6.15 (around mid
> > of Nov 2005).
> >
> > Yep, I noticed the same problem. After updating to the new kernel, the
> > performance are much better, but it's still lower than before.
>
> Here is an updated version of OpenIB IPoIB performance for various
> kernels with and without one of the TSO patches. The netperf
> performance for the latest kernels has not improved the TSO performance
> drop.
>
> Any comments or suggestions would be appreciated.
>
> - Matt
Configuration information? like did you increase the tcp_rmem, tcp_wmem?
Tcpdump traces of what is being sent and available window?
Is IB using NAPI or just doing netif_rx()?
next prev parent reply other threads:[~2006-03-07 21:49 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <OF336D72E6.999D2A30-ON8725712A.00117C92-8825712A.00116629@us.ibm.com>
2006-03-07 21:44 ` [openib-general] Re: TSO and IPoIB performance degradation Matt Leininger
2006-03-07 21:49 ` Stephen Hemminger [this message]
2006-03-07 21:53 ` Michael S. Tsirkin
2006-03-08 0:11 ` Matt Leininger
2006-03-08 0:18 ` David S. Miller
2006-03-08 1:17 ` Roland Dreier
2006-03-08 1:23 ` David S. Miller
2006-03-08 1:34 ` Roland Dreier
2006-03-08 12:53 ` Michael S. Tsirkin
2006-03-08 20:53 ` David S. Miller
2006-03-09 23:48 ` David S. Miller
2006-03-10 0:10 ` Michael S. Tsirkin
2006-03-10 0:38 ` Michael S. Tsirkin
2006-03-10 7:18 ` David S. Miller
2006-03-10 0:21 ` Rick Jones
2006-03-10 7:23 ` David S. Miller
2006-03-10 17:44 ` Rick Jones
2006-03-20 9:06 ` Michael S. Tsirkin
2006-03-20 9:55 ` David S. Miller
2006-03-20 10:22 ` Michael S. Tsirkin
2006-03-20 10:37 ` David S. Miller
2006-03-20 11:27 ` Michael S. Tsirkin
2006-03-20 11:47 ` Arjan van de Ven
2006-03-20 11:49 ` Lennert Buytenhek
2006-03-20 11:53 ` Arjan van de Ven
2006-03-20 13:35 ` Michael S. Tsirkin
2006-03-20 12:04 ` Michael S. Tsirkin
2006-03-20 15:09 ` Benjamin LaHaise
2006-03-20 18:58 ` Rick Jones
2006-03-20 23:00 ` David S. Miller
2006-04-27 4:13 ` Troy Benjegerdes
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