Red Hat Bugzilla – Bug 161428
extremely slow ethernet network connection
Last modified: 2015-01-04 17:20:33 EST
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Description of problem:
Using an up-to-date FC4 on a laptop, I am witnessing extremely slow network transfers (using either NFS or CIFS). I tried the latest development 2.6.12 kernel as well: same thing.
Using 2.6.7 from a Knoppix CD fixes the problem.
I took iptables down and tried other fixes from bugzilla searches (tcp_* values in /sys) to no avail.
Please let me know what I should do to help debug the problem (I attached dmesg output just in case). Thanks very much.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. transfer a big file over ethernet
Created attachment 115865 [details]
Wait a minute: FTP transfers are fast but it is the network mounts that create
the problem... Actually writing to remote share seems fast but reading a 1MB
file into /dev/zero takes about 2 minutes on NFS, 1 minute on CIFS and 0.25
second on SMBFS!
I am baffled. I'll take any suggestions...
[This comment has been added as a mass update for all FC4 kernel bugs.
If you have migrated this bug from an FC3 bug today, ignore this comment.]
Please retest your problem with todays 2.6.12-1.1398_FC4 update.
If your problem involved being unable to boot, or some hardware not being
detected correctly, please make sure your /etc/modprobe.conf is correct *BEFORE*
installing any kernel updates.
If in doubt, you can recreate this file using..
mv /etc/sysconfig/hwconf /etc/sysconfig/hwconf.bak
mv /etc/modprobe.conf /etc/modprobe.conf.bak
Sorry for the delay, I was out of town.
Unfortunately, 2.6.12-1.1398_FC4 did not solve the problem.
kernel 2.6.12-1.1456_FC5 solves the problem!
Mass update to all FC4 bugs:
An update has been released (2.6.13-1.1526_FC4) which rebases to a new upstream
kernel (18.104.22.168). As there were ~3500 changes upstream between this and the
previous kernel, it's possible your bug has been fixed already.
Please retest with this update, and update this bug if necessary.
Thank you very much Dave for your help.
Unfortunately, I no longer have access to that laptop.
One can only hope that the bug stayed solved, as with 2.6.12-1.1456_FC5 as I
As far as I am concerned, you may close this bug.