scp timeout on dual-core processor

[Steve Baldwin]

> -----Original Message-----
> From: cygwin-owner@cygwin.com [mailto:cygwin-owner@cygwin.com] On Behalf
> Of Harig, Mark
> Sent: Tuesday, 2 May 2006 5:20 AM
> To: cygwin@cygwin.com
> Subject: scp timeout on dual-core processor
> 
> The Cygwin version of the openssh utility program, 'scp', appears to
> have a defect that prevents
> it from copying files above a certain size, when 'scp' is running on
> computers with Intel
> dual-core processors.
> 
> Here is the information that I have gathered so far:
> 
> 1. ssh from the client machine (which has the dual-core processor)
> connects without error, and
>    the connection is stable.
> 
> 2. scp is able to copy small binary or text files from the ssh server to
> the client computer
>    without any timeout errors.  Examples:
> 
>    $ scp ssh_server:/bin/ls .
>    ls                                            100%   66KB  66.1KB/s
> 00:00
> 
>    $ scp ssh_server:/bin/date .
>    date                                          100%   38KB  37.7KB/s
> 00:00
> 
> 3. scp is unable to copy larger binary files from the ssh server to the
> client computer.
>    Examples:
> 
>    $ scp ssh_server:/usr/bin/gcc .
>    gcc                                             0%    0     0.0KB/s
> --:-- ETA
>    Disconnecting: Timeout, server not responding.
>    lost connection
> 
>    $ scp -o ServerAliveCountMax=1500 -o ServerAliveInterval=20
> ssh_server:/usr/bin/gcc .
>    gcc                                            73%   64KB   7.8KB/s -
> stalled -
>    Disconnecting: Timeout, server not responding.
>    lost connection
> 
> I repeated the above tests using Cygwin's previous version of openssh,
> 4.3p2-2, the current
> version of openssh, 4.3p2-3, and the experimental version of openssh,
> 4.3p2-4.
> 
> In the examples above, the string 'ssh_server' was replaced by the IP
> address of the Linux server
> that is running the ssh service.  The Linux server is running
> openssh-3.6.1p2.
> 
> The Cygwin client scp was installed for the first time last week, with
> the Cygwin setup.exe
> defaults selected for a base installation.  Other utility programs that
> were installed using
> 'setup.exe' are 'openssh/openssl', 'vim', and 'rxvt'.  Cygwin is
> installed on a computer
> running Windows XP.  I have installed the same version of
> Cygwin/openssh/etc. on two more
> computers with dual-core CPUs.  Both additional computers have the same
> problem.
> 
> I have repeated the commands above without any errors on computers
> running Windows 2000,
> 2003, and XP.  All computers are connected to the same network.  None of
> the computers on
> which the above commands ran successfully are using dual-core CPUs.
> 
> Using the standalone program 'WinSCP', all files listed above can be
> copied from the server
> to the client computer without any errors.
> 
> Has this problem been addressed previously?  Is it a known problem with
> Windows XP running on
> Intel dual-core processors?  Or, does anyone know whether it is a
> problem with Cygwin running on
> Windows XP on dual-core processors?
> 
> I have attached several files to provide more information:
> 
>    1. The output from the command 'cygcheck -s -v -r' (i.e.,
> cygcheck.txt)
>    2. A successful copy command using 'scp' with the option '-vvv'.
>    3. An unsuccessful copy command using 'scp' with the option '-vvv'.
> 
> If you have any ideas about what might be causing this problem; any
> ideas about how I can fix it,
> work around it, or trouble-shoot it; or would like more information
> about the environment that
> could help diagnose it, please let me know.

I have a (what appears to be) similar problem also with a dual core
(Centrino Duo) machine.  My problem manifests when I attempt to paste in an
X window (i.e. click the middle mouse button).  I immediately (100%
reproducible) get "Disconnecting: Timeout, server not responding.", and my
ssh session dies.  I'm not sure that this is an X problem so haven't posted
to the cygwin/x list, but if someone feels this is X-specific please feel
free to move it over.

As Mark has said, if I can do further diagnosis to help get to the root of
the problem please let me know.

Regards,

Steve
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