dom0 uses 105%+ of cpu

[Guy Frank]

I've noticed on my new Qubes install that dom0 is perpetually at 105% cpu when I'm not doing anything on the computer, according to xentop (which I imagine means that dom0 is using about one VCPU). Also, the hard disk light flashes every couple seconds or so. Is this all normal or is something wrong?

When I run top in dom0, it shows 75%+ going to a kworker thread, but I don't know of any way to learn what that thread is doing.

I also started my xenial qube, ran tor-browser in it, and opened a newspaper website. My dom0 xentop reading went to 200%, my xenial qube reading was at 50% even when I wasn't doing anything with tor-browser, and tor-browser was so sluggish I have to wait 15 seconds or more for a page-down. I've reproduced this problem twice. Maybe what's happening here gives some hint as to what's happening with dom0....

[Guy Frank]

Could someone clue me in on whether it's unusual for dom0 to be perpetually running the processor at at least 105% all the time according to xentop?

[Holger Levsen]

On Tue, Sep 18, 2018 at 03:11:10PM -0700, Guy Frank wrote:
> Could someone clue me in on whether it's unusual for dom0 to be perpetually running the processor at at least 105% all the time according to xentop?

13% here, when not displaying anything else on the screen. 27% when
playing music...

(with 3.2)


--
cheers,
Holger

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[Ivan Mitev]

On 9/19/18 1:11 AM, Guy Frank wrote:
> Could someone clue me in on whether it's unusual for dom0 to be perpetually running the processor at at least 105% all the time according to xentop?

What does 'top' in dom0 show ?

If you see that xenstored is using a lot of cpu, a fix is to revert to
an older version of xen-hvm-stubdom-linux [1]. That's assuming you're on
R4.0 though.


[1] https://github.com/QubesOS/qubes-issues/issues/4191

[awokd]

Holger Levsen:

> On Tue, Sep 18, 2018 at 03:11:10PM -0700, Guy Frank wrote:
>> Could someone clue me in on whether it's unusual for dom0 to be perpetually running the processor at at least 105% all the time according to xentop?
>
> 13% here, when not displaying anything else on the screen. 27% when
> playing music...
>
> (with 3.2)

Dom0's around 10% on my 4.0. 105% seems high.