Bug 234801 - openldap got poor performance with RHEL5 on HP DL380 G4 and G5
openldap got poor performance with RHEL5 on HP DL380 G4 and G5
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: openldap (Show other bugs)
i686 Linux
medium Severity high
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Assigned To: Jan Zeleny
Depends On:
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Reported: 2007-04-02 03:09 EDT by Ching-Che Yen
Modified: 2009-10-19 10:24 EDT (History)
3 users (show)

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Doc Type: Bug Fix
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Last Closed: 2009-10-19 10:24:05 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Ching-Che Yen 2007-04-02 03:09:03 EDT
Description of problem:

I created a ldap server(openldap-2.3.27-5) with RHEL5,I found the performance is
very bad on a very powerful machine(HP DL380 G5,2 way 3.2GHZ cpu,4GB Memory,SAS
disks),even I had tuned the slapd.conf and DB_CONFIG.I test it with my own
script , I found the ldap server could just handle 4 authentication queries per
second !!!

Then I tried to create ldap server  with RHEL5 on my Desktop computer(AMD
1.7Gz,2GB Memory,IDE disk),and I get greater ldap query performance on it (about
160 authentication queries per second !!!)

In order to test it further,I install RHEL4(openldap-2.2.13-6.4) and
RHEL3(openldap-2.0.27-22) on the HP DL380.All performance is very bad (about 4
to 12 authenticaion queries per second).

Then I guess that maybe it's the SMP or Hyper-threading to influence the
So I tried to unplug one cpu to reduce the number of cpu from 2 ways to 1
way,and disable Hyper-threading in the BIOS.
The result is.....still very bad.....

btw,I install the RHEL5 on another pc(p4 2.8Ghz 1GB ram),It works
smoothly.(about 140 authentication queries per second).

No I really don't know how to test it further....@_@
Could any one give me a suggesstion?

Thank you very much,and sorry for my poor english.
Comment 1 Jan Zeleny 2009-09-01 09:30:47 EDT
It has been over two years since this bugzilla was created. Is this issue still present or was there any progress?
Comment 2 Timm Stamer 2009-09-01 09:33:31 EDT
I've got a similar problem on a brand-new FSC RX200 S5 (Intel Nehalem, 12G RAM) running RHEL 5.3 x86_64.

In the first minute after enabling this host on the upstream loadbalancer (Foundry ServerIron GT E2) everything working fine. LDAP answers takes ~0.1 seconds. After some time connections get stucked and answers take up to 5 seconds or got timed out.

Other servers in the cluster are much older xeon processors w 2gb of RAM running RHEL AS4 (i386). One of these is ldap master, the new one is a replica.

Comment 3 Timm Stamer 2009-09-01 09:35:14 EDT
sorry jan, several "human interrupts" delayed my post ;)
Comment 4 Jan Zeleny 2009-09-01 11:23:45 EDT
Thank you for the info. I suggest consulting these issues with customer support, those guys might have some tips about it and there might even be no need for any patch.
Comment 5 Ching-Che Yen 2009-09-03 02:35:54 EDT
This problem was solved after about 2 months.

I think that the yum update some rpm packages to fix it.

Then I checked the yum.log file,but there are no openldap or some similar updates.

I had tried to update the rpm packages in the yum.log one bye one manually to try to repeat the problem,but I just can't repeat it anymore.(to many packages and dependence problems)

Now I just know that if I install the newest RHEL,the openldap server is ok now.
Comment 6 Jan Zeleny 2009-10-19 10:24:05 EDT
Original reporter of this bug solved the issue and I have no information to consider this to be a bug, so I'm closing it. If anyone else has similar troubles, please contact our customer support, they might help you with debugging before it gets to me as a new bug.

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