From mboxrd@z Thu Jan 1 00:00:00 1970 From: "J.Hwan Kim" Subject: Re: intel 82599 multi-port performance Date: Tue, 27 Sep 2011 09:39:06 +0900 Message-ID: <4E811B2A.7000609@gmail.com> References: <4E805359.2080600@gmail.com> <4E808A41.8040902@genband.com> <4E809D59.10103@gmail.com> <4E80C161.1040204@hp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: netdev@vger.kernel.org To: Rick Jones Return-path: Received: from mail-yw0-f46.google.com ([209.85.213.46]:55857 "EHLO mail-yw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752025Ab1I0AjO (ORCPT ); Mon, 26 Sep 2011 20:39:14 -0400 Received: by ywb5 with SMTP id 5so4814173ywb.19 for ; Mon, 26 Sep 2011 17:39:14 -0700 (PDT) In-Reply-To: <4E80C161.1040204@hp.com> Sender: netdev-owner@vger.kernel.org List-ID: On 2011=EB=85=84 09=EC=9B=94 27=EC=9D=BC 03:16, Rick Jones wrote: > On 09/26/2011 08:42 AM, J.Hwan.Kim wrote: >> On 2011=EB=85=84 09=EC=9B=94 26=EC=9D=BC 23:20, Chris Friesen wrote: >>> On 09/26/2011 04:26 AM, J.Hwan Kim wrote: >>>> Hi, everyone >>>> >>>> Now, I'm testing a network card including intel 82599. >>>> In our experiment, with the driver modified with ixgbe and multi-p= ort >>>> enabled, >>> >>> What do you mean by "modified with ixgbe and multi-port enabled"? Y= ou >>> shouldn't need to do anything special to use both ports. >>> >>>> rx performance of each port with 10Gbps of 64bytes frame is >>>> a half than when only 1 port is used. >>> >>> Sounds like a cpu limitation. What is your cpu usage? How are your >>> interrupts routed? Are you using multiple rx queues? >>> >> >> Our server is XEON 2.4GHz with 8 cores. >> I'm using 4 RSS queues for each port and distributed it's interrupts= to >> different cores respectively. >> I checked the CPU utilization with TOP, I guess ,it is not cpu imita= tion >> problem. > > 99 times out of 10, by default top will show the average CPU=20 > utilization across all the "CPUs" of the system. So I will ask the=20 > pedantic question - Did you check per-CPU utilization or just overall= ? > I checked CPU utilization per CPU with top. I pressed "1" after=20 executing top so that I can view the per-cpu utilization.