[Cbe-oss-dev] Adjusting PS3's Ethernet Link Speed

[Benjamin Rose]

For educational reasons, I've been trying to adjust the link speed of  
the ethernet connection on the PS3 from 1Gbps to 100Mbps. Using the  
ethtool results in a "Cannot set new settings: Operation not  
supported" for any variation from just ethtool -s eth0 speed 100 to  
ethtool -s eth0 speed 100 duplex full autoneg off.

I am using the latest stable 2.6.29 kernel found on kernel.org.

As a more extreme tactic, I've edited the drivers/net/ps3_gelic_net.c  
source file to force the adapter to use 100Mbps. The patch can be  
found attached to this e-mail. They're very simple changes.

With those changes ethtool eth0 now shows the speed as 100Mbps and as  
auto negotiation as off, however I am still getting 1Gbps speeds. Is  
the PS3's hypervisor to blame or was this too naive of a change?

Any help at all is greatly appreciated!!

Thanks,

Benjamin Rose
Masters Graduate Student
Department of Computer Science
Virginia Tech
http://people.cs.vt.edu/~bar234

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