Eh! I mean Mb/s NOT Kb/s! Sorry! 2009/7/1 Lada Podivin <lada.podi...@gmail.com>
> 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 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 <eeming...@hotmail.com> > > 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 one. >> >> >> BR >> Ming >> >> ------------------------------ >> Date: Tue, 30 Jun 2009 15:58:53 +0200 >> Subject: ppc405ex + gigabit ethernet >> From: lada.podi...@gmail.com >> To: linuxppc-...@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 gigabit >> 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 about >> 370 Kb/s. I tried to send the packets to several different computers - with >> 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 >> >> >> ------------------------------ >> 立刻下载 MSN 保护盾,保障 MSN 安全稳定! 现在就下载! <http://im.live.cn/safe/> >> > >
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