Hi, We were trying to figure out the network throughput on eth0 using iperf to send data over Ethernet. We are using ICS 4.0.4 with kernel 3.0.8 on Pandaboard. Eth0 gives very bad throughput in fact it almost does not work.
One strange thing we noticed is that when we keep the display (connected to pandaboard) busy (eg. keep moving mouse or have GIF in browser), then the throughput suddenly improves a lot. Infact it seems that the networking over eth0 starts working. Same was the result when I run a script in the background which just does "ls" in a loop after every 1ms interval. Only conclusion, I could draw was that CPU goes idle in ICS and thus the throughput suffers. I searched and found out that WFI (wait for interrupt) when enabled makes CPU goes idle until given an interrupt. I tried to disable it by adding "nohlt" in kernel boot args, but the throughput din't improve. Is there something more we can do prevent CPU from going idle? BR Sagar -- unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel
