linux-kernel - Re: High [extra timer interrupt] count in powertop since 2.6.36

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:	Tue, 2 Nov 2010 16:45:13 +0100 (CET)
From:	Ian Kumlien <pomac@...ius.net>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
cc:	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: High [extra timer interrupt] count in powertop since 2.6.36

On Mon, 1 Nov 2010, Jeremy Fitzhardinge wrote:

> On 10/30/2010 07:52 PM, Ian Kumlien wrote:
>> Hi,
>>
>> I have been searching the list for anyone else seeing this,
>> but i haven't found anything yet - Any ideas on how to debug?
>>
>> From powertop:
>> Top causes for wakeups:
>>   84.7% (1673.3)   [extra timer interrupt]
>>
>> Thats a little bit high in my opinion, for some reason it seems to be
>> ignored since the actual number of wakeups seems to be ~367 or so.
>>
>> Ideas? Suggestions?
>
> I'm not sure, but I'm seeing something similar.

using powertop: 1.13

< Detailed C-state information is not P-states (frequencies)
                                         3.21 Ghz     6.0%
                                         2.40 Ghz     0.0%
                                         1.60 Ghz     0.1%
                                          800 Mhz    93.9%


Wakeups-from-idle per second : 441.8    interval: 10.0s 
no ACPI power usage estimate available

Top causes for wakeups:
   84.3% (2132.0)   [extra timer interrupt]
    8.1% (205.4)   qemu-system-x86
    2.4% ( 61.0)   [eth1] <interrupt>
    1.2% ( 31.1)   [eth0] <interrupt>
    1.2% ( 29.3)   java
    1.0% ( 26.3)   [ahci] <interrupt>
    0.5% ( 13.0)   [sky2@pci:0000:05:00.0] <interrupt>
    0.5% ( 12.0)   kworker/u:2
...

Has any output been changed, is this just a missenterpetation done by powertop?

CPU: AMD Phenom(tm) II X6 1090T Processor

>    J
>
>
--
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/