Eh! I mean Mb/s NOT Kb/s! Sorry!<br><br><div class="gmail_quote">2009/7/1 Lada Podivin <span dir="ltr"><<a href="mailto:lada.podivin@gmail.com">lada.podivin@gmail.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Thank you for your reply!<br>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.<br>
<br>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? <br>
<br>Thanks!<br><br>Best,<br>Lada<br><br><div class="gmail_quote">2009/7/1 LiuMing <span dir="ltr"><<a href="mailto:eemingliu@hotmail.com" target="_blank">eemingliu@hotmail.com</a>></span><div><div></div><div class="h5">
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Hi,<br>
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>
<br>
BR<br>
Ming<br> <br>
<hr>
Date: Tue, 30 Jun 2009 15:58:53 +0200<br>Subject: ppc405ex + gigabit ethernet<br>From: <a href="mailto:lada.podivin@gmail.com" target="_blank">lada.podivin@gmail.com</a><br>To: <a href="mailto:linuxppc-dev@ozlabs.org" target="_blank">linuxppc-dev@ozlabs.org</a><div>
<div></div><div><br><br>Hi,<br><br>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: <br>
<br>netperf -t UDP_STREAM -H 192.168.1.1 -- -m 32768<br><br>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.<br>
<br>Is there any possibility to improve the gigabit capabilities of the ppc405EX? Is there anyone who achieved a better performance with ppc4xx boards?<br><br>Thanks!<br><br>Best,<br>Lada Podivin<br><br><br></div></div><div>
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