Extremely slow transfer related to ssh

["Carlos Romero Mas" <crmas at uma dot es>]

Since I have moved to Windows XP I am experiencing extremely slow
transfers using ssh related tools (rsync -essh, scp)

I have installed last version, searched for problems like this into the
mailing lists, and i have found:

cygwin deadlocks due to broken select() when writing to pipes
    http://sources.redhat.com/ml/cygwin/2003-10/msg01810.html

And 

Re: scp slow against cygwin sshd
    http://sources.redhat.com/ml/cygwin/2003-09/msg00311.html

Then I have run strace -m 0x00040 and it seems the problem sounds
similar to first reference:
.....
  138 2579039 [main] scp 3376 readv: no need to call ready_for_read
   43 2579082 [main] scp 3376 fhandler_base::read: returning 2048,
binary mode
  139 2579221 [main] scp 3376 fhandler_base::write: binary write
   51 2579272 [main] scp 3376 fhandler_base::write: 2048 = write
(0xA041AC8, 2048)
  138 2579410 [main] scp 3376 readv: no need to call ready_for_read
   46 2579456 [main] scp 3376 fhandler_base::read: returning 2048,
binary mode
  137 2579593 [main] scp 3376 fhandler_base::write: binary write
1103362 3624741 [main] ssh 1664 dtable::select_read: /dev/tcp fd 3
  716 3625457 [main] ssh 1664 select_stuff::wait: m 2, ms 4294967295
21248331 24873788 [main] ssh 1664 dtable::select_read: /dev/tcp fd 3
   81 24873869 [main] ssh 1664 dtable::select_write: /dev/tcp fd 3
   75 24873944 [main] ssh 1664 dtable::select_read: /dev/piper fd 4
  687 24874631 [main] ssh 1664 select_stuff::wait: m 3, ms 4294967295
 1622 24876253 [read_pipe] ssh 1664 fhandler_base::read: returning
16384, binary mode
22353570 24933163 [main] scp 3376 fhandler_base::write: 2048 = write
(0xA041AC8, 2048)
  253 24933416 [main] scp 3376 readv: no need to call ready_for_read
   69 24933485 [main] scp 3376 fhandler_base::read: returning 2048,
binary mode
  182 24933667 [main] scp 3376 fhandler_base::write: binary write

Thank you for this great software.

Carlos.

--
Tecnico de Sistemas
Servicio Central de Informatica
Universidad de Málaga
España


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