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
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