Gentoo Archives: gentoo-user

From: Tom Wijsman <TomWij@g.o>
To: glebiuskv@×××××.com
Cc: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Kworker use >80% of CPU
Date: Thu, 20 Mar 2014 10:24:32
Message-Id: 20140320112411.3e6baf60@gentoo.org
In Reply to: Re: [gentoo-user] Kworker use >80% of CPU by Gleb Klochkov
1 On Thu, 20 Mar 2014 11:39:58 +0400
2 Gleb Klochkov <glebiuskv@×××××.com> wrote:
3
4 > Tom, thank you for your answer.
5 >
6 > $ dmesg >> http://bpaste.net/show/187533/
7
8 There this can be seen:
9
10 [ 18.074574] [drm] Wrong MCH_SSKPD value: 0x16040307
11 [ 18.074575] [drm] This can cause pipe underruns and display
12 issues.
13 [ 18.074575] [drm] Please upgrade your BIOS to fix this.
14 [ 18.148162] [drm] GMBUS [i915 gmbus vga] timed out, falling back
15 to bit banging on pin 2
16
17 Above your messages seem interesting; some expected value is wrong, it
18 also times out on a bus and then goes to use a pin instead. Not sure
19 how much of this is intended, but try to upgrade your BIOS as suggested.
20
21 > $ cat /proc/interrupts >> http://bpaste.net/show/187537/
22
23 So, that would be this:
24
25 8: 63 0 0 0 IO-APIC-edge rtc0
26
27 Hmm, nothing about it in the dmesg; also, 63 seems low (on my system,
28 however, it's only 1 as I think my system uses something different).
29
30 You can try a different timer using this kernel parameter:
31
32 clocksource=hpet
33
34 Another note-worthy thing:
35
36 9: 699799454 0 0 0 IO-APIC-fasteoi acpi
37
38 That there are ~700 million ACPI interrupts seems abnormally high;
39 maybe the count is off by one, and 8 refers to 9? On my system, that's
40 been running for a while by now, it's only at ~6000 (six thousand).
41
42 Changing the ACPI related kernel parameters to try to get it supported
43 differently might be one thing to do here; other than that, it might be
44 something going on with the hardware (try disconnecting things?) so the
45 BIOS upgrade is certainly of interest.
46
47 Try the BIOS upgrade first, then play around with the parameters; if
48 things don't work out, I suggest you look for support on one of the
49 Linux kernel mailing lists (perhaps acpi-devel*). Good luck.
50
51 * https://lists.sourceforge.net/lists/listinfo/acpi-devel
52
53 --
54 With kind regards,
55
56 Tom Wijsman (TomWij)
57 Gentoo Developer
58
59 E-mail address : TomWij@g.o
60 GPG Public Key : 6D34E57D
61 GPG Fingerprint : C165 AF18 AB4C 400B C3D2 ABF0 95B2 1FCD 6D34 E57D

Replies

Subject Author
Re: [gentoo-user] Kworker use >80% of CPU Volker Armin Hemmann <volkerarmin@××××××××××.com>