On Tue, 30 Jun 2009, Warren Young wrote: > Corinna Vinschen wrote: > > What's still not clear is why the ssh process takes so much CPU. > > Too many buffer copies? It takes a surprising amount of CPU power to > fill a gigabit pipe from userland. Double or triple that workload with > unnecessary copies, and there goes your transfer rate, evaporating on > the wind.
Even more so for context switches ;-): http://www.cygwin.com/ml/cygwin-developers/2007-10/msg00040.html although this performance penalty was removed from read/write and friends: http://www.cygwin.com/ml/cygwin-developers/2007-12/msg00004.html it is still present for send/recv and friends. I'd be happy to make a donation or organize a fund raising effort if it would help to find a work around for this long standing performance issue. -- Brian Ford Staff Realtime Software Engineer VITAL - Visual Simulation Systems FlightSafety International the best safety device in any aircraft is a well-trained crew... -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
