Bug 639786

Summary:	Performance Tuning Guide: TRACKING BUG for [I/O] [High-Level I/O Configuration]
Product:	Red Hat Enterprise Linux 6	Reporter:	Don Domingo <ddomingo>
Component:	doc-Performance_Tuning_Guide	Assignee:	Laura Bailey <lbailey>
Status:	CLOSED NEXTRELEASE	QA Contact:	ecs-bugs
Severity:	medium	Docs Contact:
Priority:	low
Version:	6.2	CC:	dchinner, esandeen, jskeoch, mhideo, rwheeler, srao, wcohen
Target Milestone:	rc	Keywords:	Documentation, Tracking
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-10-31 01:08:39 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	639779
Deadline:	2011-07-01

Comment 7 Sanjay Rao 2011-03-14 15:44:43 UTC

I am not too familiar with systemtap so can we have someone from the systemtap review this please?

Comment 17 William Cohen 2011-06-27 13:54:26 UTC

The sentence above would address that. More information about transparent huge pages at:

www.linux-kvm.org/wiki/images/9/9e/2010-forum-thp.pdf

According to slide 12 it only works for anonymous memory regions and the following bz indicates that the user stack can make use of huge pages:

678209 - (CVE-2011-0999) CVE-2011-0999 kernel: thp: prevent hugepages during args/env copying into the user stack


Could figures 5.1, 5.2, and 5.3 be from John D. Shakshober (shak) group? Maybe he can provide some details on the benchmarks.

Comment 23 William Cohen 2011-07-24 17:13:22 UTC

The text around the graphs 5.1, 5.2 and 5.3 make it clearer what information the graphs present. The y-axis label on graph 5.3 also makes it clear what is being measured.