Bug 1015726 - Performance tool user guide - Please document that systems using HPET as a clocksource are slow.
Summary: Performance tool user guide - Please document that systems using HPET as a cl...
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: doc-Technical_Notes
Version: 7.0
Hardware: All
OS: Linux
high
medium
Target Milestone: rc
: ---
Assignee: Milan Navratil
QA Contact: ecs-bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-10-04 23:47 UTC by Jiri Hladky
Modified: 2019-03-06 01:20 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-01-19 16:17:44 UTC
Target Upstream Version:

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Description Jiri Hladky 2013-10-04 23:47:57 UTC 
Description of problem:

Performance tool user guide 

Please document that systems using HPET as a clocksource are slow. The performance regression depends on the load and is known to be as high as 25% compared to RHEL6.5. Vendors that want to make their system fast, can fix the TSC clocksource for those systems (either in firmware, or in the kernel).
Comment 1 Jiri Hladky 2013-10-04 23:49:53 UTC 
Please see BZ 971925 for technical details
Comment 3 Jiri Hladky 2013-10-05 00:04:38 UTC 
Comment: this affects mainly RHEL7 and newer releases
Comment 6 Jiri Hladky 2014-02-04 08:18:39 UTC 
Hi Laura,

yes, you are right, a technical note would be the best fit for this kind of information.

Thank you
Jirka
Comment 7 Laura Bailey 2014-02-04 20:05:31 UTC 
No worries, Jirka, popping this into the tech notes component. :)
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