Bug 683452

Summary:	[nfs/xfstests 074] Significant performance drop in nfsv4 vs nfsv3
Product:	Red Hat Enterprise Linux 6	Reporter:	Boris Ranto <branto>
Component:	kernel	Assignee:	Red Hat Kernel Manager <kernel-mgr>
Status:	CLOSED WONTFIX	QA Contact:	Filesystem QE <fs-qe>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	6.2	CC:	bfields, dhowells, jlayton, kzhang, rwheeler, steved
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-03-30 17:54:53 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description Boris Ranto 2011-03-09 12:54:29 UTC

Description of problem:
While testing nfs with xfstests I've noticed rather serious performance drop between nfs v4 and nfs v3.
For nfs v3 the test 074 took about 4 minutes.
For nfs v4 the test 074 took about 8 hours.

Version-Release number of selected component (if applicable):
2.6.32-119.el6

How reproducible:
Always

Steps to Reproduce:
1. Set up nfs v3 as default for mounting (I used localhost nfs server)
echo 'Nfsvers=3' >> /etc/nfsmount.conf
2. Set up xfstests and run test 074 for nfs (v3)
TEST_PARAM_RUNTESTS="074" TEST_PARAM_FSTYPE="nfs" make
3. Notice the test ran just few minutes (4 minutes in my case)
4. Set up nfs v4 as default for mounting
5. Set up xfstests and run test 074 for nfs (v4)
TEST_PARAM_RUNTESTS="074" TEST_PARAM_FSTYPE="nfs" make

Actual results:
The test will run for several hours.

Expected results:
The test will run for several minutes.

Additional info:

Comment 2 Steve Dickson 2011-03-10 12:59:16 UTC

What server are you running against?

Comment 3 Boris Ranto 2011-03-11 11:58:05 UTC

Server running on localhost and I mount /export/test and /export/scratch directories:
[root@intel-sugarbay-dh-01 xfstests]# cat /etc/exports 
/  *(rw,no_root_squash,fsid=0,insecure)
[root@intel-sugarbay-dh-01 ~]# mount|grep localhost
localhost:/export/test on /mnt/testarea/test type nfs (rw,context="system_u:object_r:nfs_t:s0",nfsvers=3,addr=::1)
localhost:/export/scratch on /mnt/testarea/scratch type nfs (rw,context="system_u:object_r:nfs_t:s0",nfsvers=3,addr=::1)

Comment 4 RHEL Program Management 2011-03-30 17:54:53 UTC

Development Management has reviewed and declined this request.  You may appeal
this decision by reopening this request.