MPC8313e RDB rev A4 and rev C network throughput

[Liu Dave-R63238]

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.com at lists.ozlabs.org 
> [mailto:linuxppc-dev-bounces+daveliu=freescale.com at lists.ozlab
> s.org] On Behalf Of RONETIX - Asen Dimov
> Sent: Tuesday, December 22, 2009 6:28 AM
> To: linuxppc-dev at 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
> 
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