On 2014-06-05 02:38, Jean-Yves Bernier wrote: At 4:59 PM -0700 4/6/14, Mark Pizzolato - Info Comm wrote: Did you change the number of receive buffers? That does not seem possible under RSX. It is, but you need to do it in CFE. No way of dynamically changing at runtime. That really only indicates that you're running on a platform which can do Ethernet network I/O in a parallel thread. Most platforms did not use the threaded model previously. Previously, in 3.9, Polling was still necessary since the simulator didn't really support an asynchronous I/O model. The latest codebase has support for asynchronous network AND disk I/O. On the current codebase if you've got threads available, then network reads and writes are performed asynchronously and interrupts (I/O completion) is triggered with a few microseconds of latency. As I recall from earlier in these threads, you're running under CentOS on VirtualBox. You didn't mention what host OS you're running on. In any case, the threaded model might just work better in the virtual environment. I have tested commit 753e4dc9 on Mac OS 10.6, no virtualization. Both simh instances run on the same hardware. XQ set to different MAC addresses, since this is now enforced. Asynchronous network/disk IO may explain the uncommon transfer speed (I have filled a RM03 in seconds). Interesting. I still have real network issues with the latest simh talking to a real PDP-11 sitting on the same physical network. So you seem to have hit sime other kind of limitation or something... Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol