From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bay0-omc3-s12.bay0.hotmail.com (bay0-omc3-s12.bay0.hotmail.com [65.54.246.212]) by ozlabs.org (Postfix) with ESMTP id 12566DDDF9 for ; Mon, 12 Feb 2007 02:25:33 +1100 (EST) Message-ID: In-Reply-To: From: "Ming Liu" To: imrek@atomki.hu Subject: RE: Speed of plb_temac 3.00 on ML403 Date: Sun, 11 Feb 2007 15:25:29 +0000 Mime-Version: 1.0 Content-Type: text/plain; charset=gb2312; format=flowed Cc: linuxppc-embedded@ozlabs.org List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Dear Jozsef, Thank you so much for your hints. After your telling, I tried as you told me. Here I list the script file and result. #! /bin/sh insmod ./pktgen.ko PGDEV=/proc/net/pktgen/pg0 pgset() { local result echo $1 > $PGDEV result=`cat $PGDEV | fgrep "Result: OK:"` if [ "$result" = "" ]; then cat $PGDEV | fgrep Result: fi } pg() { echo inject > $PGDEV cat $PGDEV } pgset "odev eth0" pgset "dst 192.168.0.3" pgset "pkt_size 8500" pg My board IP is 192.168.0.5 and my PC is 192.168.0.3. Also in my linux, Jumbo-frame size of 8500 is supported (max is 8982) and then I set the pkt_size as 8500. Here goes the result: pktgen.c: v1.4: Packet Generator for packet performance testing. pktgen version 1.32 Params: count 100000 pkt_size: 8500 frags: 0 ipg: 0 clone_skb: 0 odev "eth0" dst_min: 192.168.0.3 dst_max: src_min: src_max: src_mac: 00:00:00:00:00:00 dst_mac: 00:00:00:00:00:00 udp_src_min: 9 udp_src_max: 9 udp_dst_min: 9 udp_dst_max: 9 src_mac_count: 0 dst_mac_count: 0 Flags: Current: pkts-sofar: 100000 errors: 0 started: 3555387ms stopped: 3562242ms now: 3562242ms idle: 1267914442ns seq_num: 100000 cur_dst_mac_offset: 0 cur_src_mac_offset: 0 cur_saddr: 0xc0a80005 cur_daddr: 0xc0a80003 cur_udp_dst: 9 cur_udp_src: 9 Result: OK: 6824904(c2584388+d4240516) usec, 100000 (8504byte,0frags) 14652pps 996Mb/sec (996804864bps) errors: 0 # In the end, it shows 996Mb/sec, which means the throughput is 996Mbps(almost gigabit), right? However I don't think this result is so meaningful because it bypass the processing for TCP/UDP packets. In the practical implementation, that's not possible. The TCP/UDP packets have to been processed, right? In fact, this almost gigabit speed is just a representation of the Gigabit ethernet capability while the bottleneck of the system is not there. So I still need to solve my practical unsatisfying performance in my design. :( Anyway thanks for your hints and welcome to a deeper discussion. BR Ming >From: jozsef imrek >To: linuxppc-embedded@ozlabs.org >CC: rick.moleres@xilinx.com >Subject: RE: Speed of plb_temac 3.00 on ML403 >Date: Fri, 9 Feb 2007 15:57:15 +0100 (CET) > >On Fri, 9 Feb 2007, Ming Liu wrote: > > > Now with my system(plb_temac and hard_temac v3.00 with all features enabled > > to improve the performance, Linux 2.6.10, 300Mhz ppc, netperf), I can achieve > > AT MOST 213.8Mbps for TCP TX and 277.4Mbps for TCP RX, when jumbo-frame is > > enabled as 8500. For UDP it is 350Mbps for TX, also 8500 jumbo-frame is > > enabled. > > So it looks that my results are still much less than yours from > > Xilinx(550Mbps TCP TX). So I am trying to find the bottleneck and improve the > > performance. > > >when testing network performance you might want to use the packet >generator included in the 2.6 linux kernel (in menuconfig go to >Networking -> Networking options -> Network testing -> Packet Generator). > >with this tool you can bypass the ip stack, user space/kernel space >barrier, etc, and measure the speed of the hardware itself using UDP-like >packets. > >using pktgen i have seen data rates close to gigabit. (the hardware i'm >working with is a memec minimodule with V4FX12. i'm using plb_temac with >s/g dma, plb running at 100MHz, and our custom core accessed via IPIF's >address range. sw is linux 2.6.19, xilinx tools are EDK 8.2i) > > > >another hint: when transfering bulk amount of data TCP is probably an >overkill, especially on dedicated intranets and given the reliability >of the network devices available today. just use UDP if you can. > > >-- >mazsi > >---------------------------------------------------------------- >strawberry fields forever! imrek@atomki.hu >---------------------------------------------------------------- >_______________________________________________ >Linuxppc-embedded mailing list >Linuxppc-embedded@ozlabs.org >https://ozlabs.org/mailman/listinfo/linuxppc-embedded _________________________________________________________________ 与联机的朋友进行交流，请使用 MSN Messenger: http://messenger.msn.com/cn