cygwin performance problem

[Corinna Vinschen]

On Apr 21 12:15, Corinna Vinschen wrote:
> On Apr 21 07:47, Damien Miller wrote:
> > On Thu, 20 Apr 2006, Corinna Vinschen wrote:
> > 
> > > However, while looking deeper into what's going on, it seems the bad
> > > results are somehow based on a strange interaction between ssh and scp,
> > > which triggers a performance problem in Cygwin.  Writing to the pipe to
> > > scp and reading from the pipe in scp seem to take a lot of time. 
> > 
> > Cygwin is set to use pipes instead of socketpairs for communication
> > between scp/sftp and ssh, and between sshd and its subprocesses. 
> > Perhaps you could try commenting out the
> > 
> > 	AC_DEFINE(USE_PIPES, 1, [Use PIPES instead of a socketpair()])
> > 
> > line under the cygwin host case value in configure.ac, or just deleting
> > the "#define USE_PIPES" from the generated config.h. If performance 
> > improves it might indicate a problem with Cygwin's pipe implementation.
> 
> I did that already, but afaics scp always uses pipes for copying files
> over ssh, or did I miss something?

I mean the initiating scp which forks the local ssh for the remote
connection.  It always uses the pipe call regardless of the OS.


Corinna

-- 
Corinna Vinschen
Cygwin Project Co-Leader
Red Hat