Bug 145401

Summary: slowdown when running programs from NFS mount
Product: [Fedora] Fedora Reporter: Norman Gaywood <ngaywood>
Component: kernelAssignee: Dave Jones <davej>
Status: CLOSED CANTFIX QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 3CC: pfrields, wtogami
Target Milestone: ---   
Target Release: ---   
Hardware: i686   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2005-10-02 20:43:10 EDT Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
Description Flags
vmstat output running from NFS
vmstat output running from local disk
strace out of slow john none

Description Norman Gaywood 2005-01-17 18:59:08 EST
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041111 Firefox/1.0

Description of problem:
Running john the ripper from a NFS mounted directory will cause the system to become very sluggish. Copying the same program to a local disk and running from there, no slowdown.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Install john the ripper on an NFS server and export this to a client
2. On the client, run:  ./john -restore and observe sluggish system
3. cp -a run /tmp; cd /tmp/run; ./john -restore; and observe no slowdown

Expected Results:  No system slowdown.

Additional info:

I don't know if this is the same problem, but on the kernel mailing list I spotted: http://lkml.org/lkml/2005/1/17/201
Comment 1 Norman Gaywood 2005-01-17 19:09:52 EST
I have reproduced this on two kernels:

2.6.10-1.747_FC3smp on a Dell PE 2650
2.6.10-1.741_FC3smp on a Dell PE 6300/550

The problem does not exist on my dell D600 laptop: 2.6.10-1.741_FC3

Comment 2 Norman Gaywood 2005-01-17 20:16:28 EST
Created attachment 109905 [details]
vmstat output  running from NFS

This is output of vmstat during a slowdown. vmstat was started, then john was
started from an NFS mounted directory, run for a few seconds then killed.
system time looks interesting to me.
Comment 3 Norman Gaywood 2005-01-17 20:18:17 EST
Created attachment 109906 [details]
vmstat output  running from local disk

Same thing as previous except that this time we run from local disk. No
slowdown when we do this.
Comment 4 Norman Gaywood 2005-01-17 20:34:22 EST
Created attachment 109907 [details]
strace out of slow john

strace of a running john on a slow system.
Comment 5 Dave Jones 2005-07-15 16:01:51 EDT
An update has been released for Fedora Core 3 (kernel-2.6.12-1.1372_FC3) which
may contain a fix for your problem.   Please update to this new kernel, and
report whether or not it fixes your problem.

If you have updated to Fedora Core 4 since this bug was opened, and the problem
still occurs with the latest updates for that release, please change the version
field of this bug to 'fc4'.

Thank you.
Comment 6 Dave Jones 2005-10-02 20:43:10 EDT
This bug has been automatically closed as part of a mass update.
It had been in NEEDINFO state since July 2005.
If this bug still exists in current errata kernels, please reopen this bug.

There are a large number of inactive bugs in the database, and this is the only
way to purge them.

Thank you.