Red Hat Bugzilla – Bug 129204
2.6.7.1.494.2.2 Kernel Networking Problem
Last modified: 2015-01-04 17:08:28 EST
Description of problem: My FC2 computer is on a LAN with Win98SE and Win2k computers. Often I transfer files from the Win computers to the FC2 computer. I have Samba 3.0.3.5 installed. I use the Nautilus file browser to open a window for the share on the Win computer, open another window for a directory on the FC2 computer, and simply drop-and-drag files from one window to another. This works fine for kernels up through 2.6.6-1.435.2.3 Recently I installed the new 2.6.7-1.494.2.2 kernel. Now, when I try to drop-and-drag files, the "copying files" window freezes. When I reboot with the older kernel, I can transfer files as before. Version-Release number of selected component (if applicable): 2.6.7.1.494.2.2 kernel How reproducible: always Steps to Reproduce: 1. see above 2. 3. Actual results: file transfer freezes Expected results: normal file transfer Additional info:
I have spurratic TCP hang problems with the new kernel (2.6.7-1.494.2.2). My Mail client hangs when getting mail, my browser hangs when loading web pages, my ssh client hangs when typing commands. Downgrading to 2.6.6-1.435.2.3 solved the problem.
*** Bug 129136 has been marked as a duplicate of this bug. ***
*** Bug 129135 has been marked as a duplicate of this bug. ***
Getting the same problem here, a bunch of TCP connections that worked fine under kernel-2.6.6-1.435.2.3 are now broken under kernel-2.6.7-1.494.2.2. For instance, I normally have several SSH sessions open (to Linux and FreeBSD boxes). Some of those no longer work, the SSH client hangs before ever authenticating.
Please see this thread for a possible fix: http://www.redhat.com/archives/fedora-list/2004-August/msg01490.html Worked for me, too. ;-)
Indeed. This does "fix" the issue I was having. However, I didn't have to set both of the variables, just the following one: net.ipv4.tcp_default_win_scale=0 Thanks for finding this solution.
This solved the file tranfer problem I originally reported. Thanks so much. This is what I love about the open source community. Open Source Rocks!
Solved my wget and curl problem too. However, the bug still exists fro kernel-2.6.8.1. For the benefit of others who don't want to look through other threads (http://www.linuxarkivet.se/mlists/linux-net/0406/msg00230.html), you can do the following: Add the following to /etc/sysctl.conf and reboot: # The following solves a kernel networking problem with kernel-2.6.7- 1.494.2.2, kernel-2.6.8-1.521. If you finally do not need it, just comment them with a leading #. net.ipv4.tcp_default_win_scale = 0
this thread is similar to https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=126626
more info at http://lwn.net/Articles/91976/
mass update for old bugs: Is this still a problem in the 2.6.9 based kernel update ?
I no longer have an FC2 system to test with (they've both been upgraded to FC3), but FC3 no longer appears to have the net.ipv4.tcp_default_win_scale sysctl: $ uname -r 2.6.9-1.681_FC3 $ /sbin/sysctl net.ipv4.tcp_default_win_scale error: 'net.ipv4.tcp_default_win_scale' is an unknown key Everything does appear to work fine, though.