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> -----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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cygcheck.txt
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