Red Hat Bugzilla – Bug 198621
NFS slow on Networked Cluster with kernel 2.6.17-1.2145_FC5
Last modified: 2015-01-04 17:27:53 EST
Description of problem:
After an upgrade to Fedora Core 5 this past weekend on our servers, I noticed a
slowdown on one of our clustered apache servers.
We have a master and a slave server (so to speak) both of which have web services
We are sharing /var/lib/php/session/ so that when somebody visits our website, any of
our webservers can handle the person without getting rid of their session variables.
Version-Release number of selected component (if applicable):
Very reproducible, after 12 hours of picking apart each and everything that could be the
possibility. (firewall, apache configuration problem, watching all the logs) I figured out
that in the /var/log/messages on the slave machine had this:
ul 11 21:45:00 patty kernel: lockd: server 188.8.131.52 not responding, timed out
Jul 11 21:45:53 patty kernel: do_vfs_lock: VFS is out of sync with lock manager!
Jul 11 21:46:00 patty kernel: lockd: server 184.108.40.206 not responding, timed out
Jul 11 21:47:00 patty kernel: lockd: server 220.127.116.11 not responding, timed out
Steps to Reproduce:
1. Build a master and slave computer using NFS for /var/lib/php/session
2. Build a website that handles lots of traffic
3. Watch the slave become slow as molassass when you benchmark it with traffic.
Web Services are transparent. The service should run as fast as a computer that has
the file share directly on their own computer.
Couple of things... what server are you using and to could you post a
bzip2 tethereal network trace... something like:
tethereal -w /tmp/data.pcap host <server> ; bzip2 /tmp/data.pcap
It appears your server is not responding in a timely fashion and hopefully
the network trace will show why...
A new kernel update has been released (Version: 2.6.18-1.2200.fc5)
based upon a new upstream kernel release.
Please retest against this new kernel, as a large number of patches
go into each upstream release, possibly including changes that
may address this problem.
This bug has been placed in NEEDINFO state.
Due to the large volume of inactive bugs in bugzilla, if this bug is
still in this state in two weeks time, it will be closed.
Should this bug still be relevant after this period, the reporter
can reopen the bug at any time. Any other users on the Cc: list
of this bug can request that the bug be reopened by adding a
comment to the bug.
In the last few updates, some users upgrading from FC4->FC5
have reported that installing a kernel update has left their
systems unbootable. If you have been affected by this problem
please check you only have one version of device-mapper & lvm2
installed. See bug 207474 for further details.
If this bug is a problem preventing you from installing the
release this version is filed against, please see bug 169613.
If this bug has been fixed, but you are now experiencing a different
problem, please file a separate bug for the new problem.
This bug has been mass-closed along with all other bugs that
have been in NEEDINFO state for several months.
Due to the large volume of inactive bugs in bugzilla, this
is the only method we have of cleaning out stale bug reports
where the reporter has disappeared.
If you can reproduce this bug after installing all the
current updates, please reopen this bug.
If you are not the reporter, you can add a comment requesting
it be reopened, and someone will get to it asap.