From: bugzilla-daemon@bugzilla.kernel.org
To: linux-pm@vger.kernel.org
Subject: [Bug 209069] New: CPU stuck at 800 MHz at any load
Date: Sat, 29 Aug 2020 14:51:11 +0000 [thread overview]
Message-ID: <bug-209069-137361@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=209069
Bug ID: 209069
Summary: CPU stuck at 800 MHz at any load
Product: Power Management
Version: 2.5
Kernel Version: 5.8.5
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: cpufreq
Assignee: linux-pm@vger.kernel.org
Reporter: tg@gmplib.org
Regression: No
Environment 1:
OS: GNU/Linux/Xen Gentoo 17.1 (ker=5.8.5 xen=4.12.3)
mbd: Supermicro X10SLH-F-O S1150 µATX (BIOS 3.3 2020-06-13)
cpu: Intel HWL X4 3600MHz (Xeon E3-1271v3, ECC)
memory: 8192MB SDRAM DDR3L-1600 ECC (Samsung M391B1G73QH0-YK0Q)
memory: 8192MB SDRAM DDR3L-1600 ECC (Samsung M391B1G73QH0-YK0Q)
memory: 8192MB SDRAM DDR3L-1600 ECC (Samsung M391B1G73QH0-YK0Q)
memory: 8192MB SDRAM DDR3L-1600 ECC (Samsung M391B1G73QH0-YK0Q)
disk: SATA SSD 2.5" 120GB Samsung SM863
case: Supermicro CSE-510T-203B
Environment 2. Almost identical, but with this cpu:
cpu: Intel BWL X4 3400MHz LLC=6M+128M (Xeon E3-1285Lv4)
I upgraded from 5.4.48 to 5.8.x for various versions of x to finally reach x =
5. Now, the systems get stuck at what is displayed as 800 MHz in /proc/cpuinfo.
When booted to run Xen, the problem goes away. When booting the (Xen
Dom0-capable) kernel without Xen, the clock gets stuck at 800 MHz at any load.
It's certainly not just a problem with /proc/cpuinfo's displayed frequency; the
systems are really, really sluggish.
A similarly configured Skylake system does NOT exhibit the same problem. (The
motherboard of that system is Supermicro X11SSM.) Similarly configured Sandy
Bridge and Westmere systems also do not exhibit this problem.
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next reply other threads:[~2020-08-29 14:51 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-29 14:51 bugzilla-daemon [this message]
2020-08-29 15:00 ` [Bug 209069] CPU stuck at 800 MHz at any load bugzilla-daemon
2020-08-29 15:23 ` bugzilla-daemon
2020-08-29 17:25 ` bugzilla-daemon
2020-08-29 18:07 ` bugzilla-daemon
2020-09-02 18:36 ` bugzilla-daemon
2020-09-05 14:33 ` bugzilla-daemon
2020-09-05 16:01 ` bugzilla-daemon
2020-09-06 18:37 ` bugzilla-daemon
2021-03-21 15:48 ` bugzilla-daemon
2021-04-21 2:16 ` [Bug 209069] CPU stuck at 800 MHz at any load - Xeon E3-1271v3 HSW bugzilla-daemon
2021-04-21 2:16 ` bugzilla-daemon
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