Bug 168612

Summary: OpenLDAP performance problem under load, caused by sched_yield()
Product: [Fedora] Fedora Reporter: Bernie Innocenti <bernie+fedora>
Component: openldapAssignee: Jay Fenlason <fenlason>
Status: CLOSED CURRENTRELEASE QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: jfeeney, tmraz
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Hardware: All   
OS: Linux   
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Fixed In Version: 2.3.19 Doc Type: Bug Fix
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Last Closed: 2006-08-03 21:50:06 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
Proposed fix by Howard Chu none

Description Bernie Innocenti 2005-09-18 03:02:16 UTC 
Description of problem:

OpenLDAP 2.2.26 has a scheduling bug that makes any query crawl
under moderate CPU load (even nice load).

This is again the usual sched_yield() behavior change that has
haunted OpenOffice and other applications.

This issue has been recently discussed on LKML and in OpenLDAP's
bug-tracking system.  One of the authors recommends upgrading to
2.3.7.  Is there a chance we can get this in rawhide or even FC4?


Version-Release number of selected component (if applicable):
2.2.26-1

How reproducible:
always

Steps to Reproduce:
1.start a long-running CPU-bound process such as gcc
2.try some LDAP queries and measure with time or strace -t
Comment 1 Bernie Innocenti 2005-11-25 02:46:28 UTC 
OpenLDAP 2.3.11 has been included in fedora-development.

By the way, the bug I was moaning about is still there.
I will complain upstream.
Comment 2 Bernie Innocenti 2005-11-26 01:45:08 UTC 
Created attachment 121499 [details]
Proposed fix by Howard Chu
Comment 3 Bernie Innocenti 2005-11-26 01:45:46 UTC 
Applying the attached patch to openldap-2.3.11 fixed the problem for me.
Please include it in the package patch set until it's available from upstream.
Comment 4 Bernie Innocenti 2006-08-03 21:48:34 UTC 
Problem appears to be fixed in FC5 with openldap 2.3.19.