Bug 548565

Summary: aio: eventfd support introduced a 0.5% performance regression
Product: Red Hat Enterprise Linux 5 Reporter: Jeff Moyer <jmoyer>
Component: kernelAssignee: Jeff Moyer <jmoyer>
Status: CLOSED ERRATA QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: medium Docs Contact:
Priority: low    
Version: 5.5Keywords: Regression
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2010-03-30 07:43:52 UTC Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description Flags
fix performance regression by using a bit in ki_flags none

Description Jeff Moyer 2009-12-17 20:00:29 UTC 
Description of problem:
OLTP-type runs regressed by .5% due to the additional overhead in the aio_complete code path.

Version-Release number of selected component (if applicable):
kernel-2.6.18-181.el5

How reproducible:
100%

Steps to Reproduce:
1. run oltp-type workload on huge system
Comment 2 Jeff Moyer 2010-01-11 19:35:25 UTC 
Created attachment 383071 [details]
fix performance regression by using a bit in ki_flags
Comment 4 RHEL Program Management 2010-01-11 19:52:14 UTC 
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.
Comment 14 errata-xmlrpc 2010-03-30 07:43:52 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2010-0178.html