ROACH2's PHY is different. It's now Marvel (as opposed to a National Semi on ROACH1). It works reliably at 1Gbps.
I bank on 10Mb/s on ROACH1, which is achievable using the normal katcp and tcpborphserver2 without any trickery. You can get better if you write your own PPC code. ROACH2 should be about a factor of 2 faster, but I haven't benchmarked it. Jason On 29 Apr 2013, at 00:08, John Ford wrote: >> hi john, >> >> i think all roach1's PPC ethernet ports need to be used at 100Mb/sec port >> speed, >> independent of when the boards were made, and not at 1Gbit/sec. >> > > Thanks, Dan. I thought that a PHY chip had been changed, but I couldn't > remember. Now I seem to recall that the Phy is just Not Good. > >> it's tricky to write PPC software that gets more than 20Mbit/sec >> out of the port, but i'm not sure about this 20Mbit/sec number. > > OK. I wonder if anyone else has experience with this? I guess we'll test > it if not... > > John > >> >> best wishes, >> >> dan >> >> >> On Sun, Apr 28, 2013 at 1:57 PM, John Ford <[email protected]> wrote: >> >>> Hi all. >>> >>> Can someone tell me if the ethernet port on the newer ROACH boards is >>> reliable at 1 gb/s? >>> >>> Also, what is the maximum data rate expected through that interface? >>> >>> Thanks! >>> >>> John >>> >>> >>> >>> >> > > >
