On Feb 19, 2008 9:30 AM, chris rapier <[EMAIL PROTECTED]> wrote: > > I wonder where the perceived bottleneck is. I mean, you have two boxes > > connected by ethernet (whatever speed), and you're running a sftp bulk > > file transfer. What is the limiting factor? Are the boxes less than > > 20% idle? Is the nework saturated or is there room for more throughput? > > Much of this is answered in the papers or presentations on the HPN-SSH > website (http://www.psc.edu/networking/projects/hpn-ssh/). The executive > summary is that once you start hitting GigE speeds the CPU becomes the > limiting factor. In our test environment (two 8 core machines hooked up > over a LAN) AES128-CTR got us around 500Mb/s. At that point the SSH > process was pegging a core at 100%. When we tried the same test with th > threaded/parallelized AES-CTR mode cipher we saw the performance nearly > double to 938Mb/s.
Probably out of scope, but I wonder if you guys would take a look at the Via C7 or Eden cpus? Apparently, in the past, some benchmarks showed spectacular results, compared with intel cpus. -- http://www.glumbert.com/media/shift http://www.youtube.com/watch?v=tGvHNNOLnCk "This officer's men seem to follow him merely out of idle curiosity." -- Sandhurst officer cadet evaluation. "Securing an environment of Windows platforms from abuse - external or internal - is akin to trying to install sprinklers in a fireworks factory where smoking on the job is permitted." -- Gene Spafford learn french: http://www.youtube.com/watch?v=j1G-3laJJP0&feature=related
