[Bug 215459] VM freezes starting with kernel 5.15

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215459

--- Comment #11 from th3voic3@mailbox.org ---
(In reply to mlevitsk from comment #10)
> On Mon, 2022-01-10 at 09:30 +0000, bugzilla-daemon@bugzilla.kernel.org wrote:
> > https://bugzilla.kernel.org/show_bug.cgi?id=215459
> > 
> > --- Comment #9 from th3voic3@mailbox.org ---
> > I've compiled the 5.16 kernel now and so far it's looking very good. APICv
> > and
> > tdp_mmu are both enabled. Also thanks to dynamic PREEMPT I no longer need
> to
> > recompile to enable voluntary preemption to cut down my VMs boot time.
> > 
> Great to hear that.
>  
> I am just curious, with what PREEMPT setting, the boot is slow?
> With full preemption? I also noticed that long ago, before I joined redhat,
> back when I was just a VFIO fan, that booting with large amounts of ram
> (32 back then I think), forced preemption and passed-through GPU makes
> The VM hang for about like 1/2 of a minute before it shows the bios splash
> screen.
>  
> Best regards,
>       Maxim Levitsky

Yeah it used to be like that.
I just compared the two though (full vs voluntary PREEMPT) and it doesn't seem
to make a difference anymore. Full preemption is now just as fast as voluntary
preemption, so I'm just sticking with full preemption since it's my distros
default.

Best regards

Nico

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are watching the assignee of the bug.