One possible cause is the two board has different RCW. So that the freq of core/csb/.... Is different.
> -----Original Message----- > From: > linuxppc-dev-bounces+daveliu=freescale....@lists.ozlabs.org > [mailto:linuxppc-dev-bounces+daveliu=freescale....@lists.ozlab > s.org] On Behalf Of RONETIX - Asen Dimov > Sent: Tuesday, December 22, 2009 6:28 AM > To: linuxppc-dev@lists.ozlabs.org > Subject: MPC8313e RDB rev A4 and rev C network throughput > > Hello all, > I have made some test on network throughput with MPC8313e RDB > revA4 and revC. > Some have mentioned that CSB(Coherent System Bus) frequency > or untuned TCP/IP stack, could cause decrease of network throughput. > > **Test results > > -on MPC8313e RDB revA4 with kernel 2.6.20 and u-boot 1.1.6 > created with > ltib-mpc8313erdb-20070824 > iperf -c 172.16.0.1 -l 2m -w 256k -throughput is 510Mbps > > > -on MPC8313e RDB revA4 with kernel 2.6.23 and u-boot 1.3.0 generated > with ltib-mpc8313erdb-20081222 > iperf -c 172.16.0.1 -l 2m -w 256k > -throughput is 510Mbps > > > -on MPC8313e RDB revC with kernel 2.6.23 (the same u-boot, kernel and > rootfs as in rev A4, only dtb file differs) > iperf -c 172.16.0.1 -l 2m -w 256k > -throughput is 360Mbps. > > > Have someone made such measurements? Any ideas why MPC8313e RDB revC > gives worser throughput than revA4? > > ** Notes > *The PC (CPU:Intel(R) Core(TM)2 Duo CPU, E8400 @ 3.00GHz; > RAM: 2x2G DDR2 @ 800Mhz ; > NIC: R8168B PCI Express Gigabit Ethernet controller, driver > 8.014.00-NAPI; > OS: Fedora release 10 (Cambridge) with kernel: > 2.6.27.38-170.2.113.fc10.i686.PAE #1 SMP ) > *Commnads to set PC > > ethtool -s eth0 autoneg off speed 1000 duplex full > ifconfig eth1 172.16.0.1/12 mtu 6000 txqueuelen 10000 > echo 131071 > /proc/sys/net/core/rmem_max > echo 131071 > /proc/sys/net/core/wmem_max > echo "4096 1048576 8388608" > /proc/sys/net/ipv4/tcp_rmem > echo "4096 1048576 8388608" > /proc/sys/net/ipv4/tcp_wmem > iperf -s -l 2m -w 70k > > > *The MPC8313e RDB(CPU: 333Mhz; CSB: 166Mhz) revA4 and > revC(using PHY not > switch) > *Commnads to set a board before using iperf > > ifconfig eth1 172.16.0.1/12 mtu 6000 txqueuelen 10000 > #The PC lan card is set to advertise 1000Mbps only, so the > board switches to 1000Mbps too. > echo 131071 > /proc/sys/net/core/rmem_max > echo 131071 > /proc/sys/net/core/wmem_max > echo "4096 1048576 8388608" > /proc/sys/net/ipv4/tcp_rmem > echo "4096 1048576 8388608" > /proc/sys/net/ipv4/tcp_wmem > > Regards, > Asen > > _______________________________________________ > Linuxppc-dev mailing list > Linuxppc-dev@lists.ozlabs.org > https://lists.ozlabs.org/listinfo/linuxppc-dev > > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
