From: "Luis R. Rodriguez" <firstname.lastname@example.org> To: Andrew Cooper <email@example.com> Cc: "Luis R. Rodriguez" <firstname.lastname@example.org>, "email@example.com" <firstname.lastname@example.org> Subject: Re: Xen default install - no cpufreq on dom0 ? Date: Wed, 6 Apr 2016 05:18:23 +0200 [thread overview] Message-ID: <20160406031823.GY1990@wotan.suse.de> (raw) In-Reply-To: <56CCF184.email@example.com> On Tue, Feb 23, 2016 at 11:55:48PM +0000, Andrew Cooper wrote: > On 23/02/2016 23:44, Luis R. Rodriguez wrote: > > On Tue, Feb 23, 2016 at 10:44:56PM +0000, Andrew Cooper wrote: > >> On 23/02/2016 22:18, Luis R. Rodriguez wrote: > >>> On Tue, Feb 23, 2016 at 05:00:12PM -0500, Konrad Rzeszutek Wilk wrote: > >>>> On Tue, Feb 23, 2016 at 12:48:18PM -0800, Luis R. Rodriguez wrote: > >>>>> For a while now I've been installing Xen from source on my Debian box, > >>>>> with a default configuration always. This is party why I've run into > >>>>> compile issues before it seems, but I've also just picked up on > >>>>> another possible issue. My system on dom0 overheats and shuts itself > >>>>> off. For a while I didn't think this was Xen related and perhaps > >>>>> related to the fact that I built this system myself. However, after > >>>>> running Debian without Xen (rm -rf /boot/xen*; update-grub; reboot; > >>>>> systemd-detect-virt yield none) it would seem this does not happen. > >>>>> What's a bit concerning though is even if I run offlineimap in > >>>>> singlethreaded mode (offlineimap -1) the machine overheats and shuts > >>>>> itself off, so I don't necessarily need to be doing a lot of work. I > >>>>> tried compiling the kernel without Xen while running offlineimap as > >>>>> well with make -j 8 and it doesn't overheat, meanwhile on Xen dom0 > >>>>> just using offlineimap -1 seems to trigger a shutoff rather quickly. > >>>> What exactly triggers the shutoff. > >>> Clearly, overheating. I'm not yet sure if its just BIOS/kernel/hypervisor > >>> induced forced shutdown. Will try again, but this is rather intrusive as > >>> its on my personal home system. > >> You have dislodged the heat sync and the processor is shutting down due > >> to thermal cutout. > > How do I prevent this ? > > Open up your computer and shuffle things around. Alternatively unclog > the fan. Possibly both. This wasn't it. It would seem some AMD systems have a boost option available, disabling that fixes my woes: echo 0 > /sys/devices/system/cpu/cpufreq/boost With this my Linux box without Xen survices the most extreme of situations. On Linux this is implemented as a cpu freq driver callback cpufreq_driver->set_boost(state), see cpufreq_boost_trigger_state()., on drivers/cpufreq/cpufreq.c. I don't find any of this on the Xen hypervisor. How can I address this on Xen? > > The difference in operation between dom0 and > > bare metal is rather extreme. Is this expected ? Is there a clutch > > I can use ? > > The only thing software can control is now badly things go wrong. It is > not the source of the problem. > > Baremetal probably has deep C and P states set up properly, but it will > still be under clocking as much as it can in an attempt to avoid > generating as much heat. Should be under clocking.. Luis _______________________________________________ Xen-devel mailing list Xenfirstname.lastname@example.org http://lists.xen.org/xen-devel
prev parent reply other threads:[~2016-04-06 3:18 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-02-23 20:48 Luis R. Rodriguez 2016-02-23 22:00 ` Konrad Rzeszutek Wilk 2016-02-23 22:18 ` Luis R. Rodriguez 2016-02-23 22:36 ` Konrad Rzeszutek Wilk 2016-02-23 22:44 ` Andrew Cooper 2016-02-23 23:44 ` Luis R. Rodriguez 2016-02-23 23:55 ` Andrew Cooper 2016-04-06 3:18 ` Luis R. Rodriguez [this message]
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