From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [203.10.76.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mx.ozlabs.org", Issuer "CA Cert Signing Authority" (verified OK)) by bilbo.ozlabs.org (Postfix) with ESMTPS id E5A15B70ED for ; Wed, 1 Jul 2009 21:31:48 +1000 (EST) Received: from mail-fx0-f222.google.com (mail-fx0-f222.google.com [209.85.220.222]) by ozlabs.org (Postfix) with ESMTP id 02DBEDDD0C for ; Wed, 1 Jul 2009 21:31:44 +1000 (EST) Received: by fxm22 with SMTP id 22so842750fxm.9 for ; Wed, 01 Jul 2009 04:31:42 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: Date: Wed, 1 Jul 2009 13:24:41 +0200 Message-ID: Subject: Re: ppc405ex + gigabit ethernet From: Lada Podivin To: LiuMing Content-Type: multipart/alternative; boundary=0016e6d7845b569f56046da32b07 Cc: linuxppc-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --0016e6d7845b569f56046da32b07 Content-Type: text/plain; charset=GB2312 Content-Transfer-Encoding: quoted-printable Thank you for your reply! Yes, I agree the CPU is the bottleneck. But I have performed more tests wit= h the netperf tool and results seem strange to me. If I send 800 B of data, the resulting speed is aproximately 100 Kb/s. On the other hand, If I try t= o send 32KB chunk of data with jumbo frames turned on, resulting speed is about 600 Kb/s (300-400 without jumbo frames). My ppc405ex runs at 600 MHz. So it seems that it is definetely better idea to call sendto() less frequently with bigger amounts of data, than to call it more often with smaler amounts. Is it because smaller data means more frequent user space/kernel space switching? Or is it network related issue? Thanks! Best, Lada 2009/7/1 LiuMing > Hi, > According to our experience on PPC405 + Gigabit Enet, your result is > already very reasonable. For UDP transmission, it can be around 400 Kb/s > because of the CPU bottleneck (in our case 300 MHz ppc405). If you want > to further improve it, a faster CPU is needed to process the TCP/IP stack= , > or you may buy commercial TCP/IP stack rather than using the free Linux o= ne. > > > BR > Ming > > ------------------------------ > Date: Tue, 30 Jun 2009 15:58:53 +0200 > Subject: ppc405ex + gigabit ethernet > From: lada.podivin@gmail.com > To: linuxppc-dev@ozlabs.org > > > Hi, > > I benchmarked performance of my network, which contains ppc405EX (Kilauea > board, kernel 2.6.30 from Denx) connected with a linux desktop via gigabi= t > ethernet. I used the netperf tool: > > netperf -t UDP_STREAM -H 192.168.1.1 -- -m 32768 > > So I was sending UDP packets to the desktop. The resulting speed was abou= t > 370 Kb/s. I tried to send the packets to several different computers - wi= th > the same result. So the ppc board is the bottleneck in this case. > > Is there any possibility to improve the gigabit capabilities of the > ppc405EX? Is there anyone who achieved a better performance with ppc4xx > boards? > > Thanks! > > Best, > Lada Podivin > > > ------------------------------ > =C1=A2=BF=CC=CF=C2=D4=D8 MSN =B1=A3=BB=A4=B6=DC=A3=AC=B1=A3=D5=CF MSN =B0= =B2=C8=AB=CE=C8=B6=A8=A3=A1 =CF=D6=D4=DA=BE=CD=CF=C2=D4=D8=A3=A1 > --0016e6d7845b569f56046da32b07 Content-Type: text/html; charset=GB2312 Content-Transfer-Encoding: quoted-printable Thank you for your reply!
Yes, I agree the CPU is the bottleneck. But I = have performed more tests with the netperf tool and results seem strange to= me. If I send 800 B of data, the resulting speed is aproximately 100 Kb/s.= On the other hand, If I try to send 32KB chunk of data with jumbo frames t= urned on, resulting speed is about 600 Kb/s (300-400 without jumbo frames).= My ppc405ex runs at 600 MHz.

So it seems that it is definetely better idea to call sendto() less fre= quently with bigger amounts of data, than to call it more often with smaler= amounts. Is it because smaller data means more frequent user space/kernel = space switching? Or is it network related issue? 

Thanks!

Best,
Lada

2009/7/1= LiuMing <eem= ingliu@hotmail.com>
Hi,
According to our experience on PPC405 + Gigabit Enet, your result is alread= y very reasonable. For UDP transmission, it can be around 400 Kb/s because = of the CPU bottleneck (in our case 300 MHz ppc405). If you want to&nbs= p;further improve it, a faster CPU is needed to process the TCP/IP stack, o= r you may buy commercial TCP/IP stack rather than using the free = Linux one.
 
BR
Ming
 
Date: Tue, 30 Jun 2009 15:58:53 +0200
Subject: ppc405ex + gigabit ethern= et
From: lad= a.podivin@gmail.com
To: linuxppc-dev@ozlabs.org


Hi,

I benchmarked performance o= f my network, which contains ppc405EX (Kilauea board, kernel 2.6.30 from De= nx) connected with a linux desktop via gigabit ethernet. I used the netperf= tool:

netperf -t UDP_STREAM -H 192.168.1.1 -- -m 32768

So I was sendin= g UDP packets to the desktop. The resulting speed was about 370 Kb/s. I tri= ed to send the packets to several different computers - with the same resul= t. So the ppc board is the bottleneck in this case.

Is there any possibility to improve the gigabit capabilities of the ppc= 405EX? Is there anyone who achieved a better performance with ppc4xx boards= ?

Thanks!

Best,
Lada Podivin


=C1=A2=BF=CC=CF=C2=D4=D8 MSN =B1=A3=BB=A4=B6=DC=A3=AC=B1=A3=D5=CF MSN = =B0=B2=C8=AB=CE=C8=B6=A8=A3=A1 =CF=D6=D4=DA=BE=CD=CF=C2=D4=D8=A3=A1

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