linux-kernel - Re: [PATCH] process cputimer is moving faster than its corresponding clock

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 27 Apr 2013 01:17:06 -0400
From:	Olivier Langlois <olivier@...vierlanglois.net>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, schwidefsky@...ibm.com,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] process cputimer is moving faster than its
 corresponding clock


> 
> 
> Also other factors to consider it is are you doing the test on a very
> loaded system? What is your platform?
> 
> I have tested it positively on 32 bit, 64 bits build on Atom N450
> 
> i7 first and second generation system.
> 
> I did vary HZ from 300 to 1000 HZ, I tried the 3 three different
> preemption models.
> 
> With all these combinations, I still have the problem.
> 
Kosaki,

Also clocksource accuracy may affect the result. Here are mines:

lano1106@...ini ~ $
cat /sys/devices/system/clocksource/clocksource0/current_clocksource 
hpet


lano1106@...laba2 ~/dev/linux/src/linux-3.8/kernel $
cat /sys/devices/system/clocksource/clocksource0/current_clocksource
tsc


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/