https://bugzilla.mindrot.org/show_bug.cgi?id=1697
Charles Davis <[email protected]> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED --- Comment #2 from Charles Davis <[email protected]> 2010-01-14 01:23:56 EST --- (In reply to comment #1) > I suspect you have a device in your network path that cannot handle > large TCP windows, probably window scaling. > > One of the changes in the 4.7 release was: > > * The SSH channel window size has been increased, and both ssh(1) > sshd(8) now send window updates more aggressively. These improves > performance on high-BDP (Bandwidth Delay Product) networks. > > Previously this was limited to 64k, which is not enough to exercise TCP > window scaling. You can confirm this by looking at the "SendQ" field > in the connection in the netstat output on the sending side (this is on > Linux, I don't know how to get the equivalent data on Windows). If the > number is non-zero and doesn't decrease this is almost certainly the > problem. > > You can also try disabling window scaling. On Linux, that's "echo 0 > >/proc/sys/net/ipv4/tcp_window_scaling". I don't know about Windows > but presumably it's in the registry somewhere. You'll only need to > disable it on one end and retry the copy. This: "echo 0 >/proc/sys/net/ipv4/tcp_window_scaling" completely fixes the problem. Thanks loads. As far as I am concerned it is fixed. So I am changing the status. However, before I came to you fellows, I searched extensively and there seems to ba a lot of instances of this problem. Is there somewhere I can add a FAQ or soemthing like that?? Charles Davis -- Configure bugmail: https://bugzilla.mindrot.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. You are watching someone on the CC list of the bug. _______________________________________________ openssh-bugs mailing list [email protected] https://lists.mindrot.org/mailman/listinfo/openssh-bugs
