Re: [Xen-devel] [PATCH] x86/nmi: lower initial watchdog frequency to avoid boot hangs

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.02.18 at 22:18, <igor.druzhinin@xxxxxxxxxx> wrote:
> --- a/xen/arch/x86/nmi.c
> +++ b/xen/arch/x86/nmi.c
> @@ -34,7 +34,8 @@
>  #include <asm/apic.h>
>  
>  unsigned int nmi_watchdog = NMI_NONE;
> -static unsigned int nmi_hz = HZ;
> +/* initial watchdog frequency - shouldn't be too high to avoid boot hangs */
> +static unsigned int nmi_hz = HZ / 10;

For one - the comment should explain what "too high" means.
Further - what if on another system 10Hz is still too high? I also hope
you realize that you slow down boot a little for everyone just
because of this one machine model. Can the lower frequency perhaps
be set via DMI quirk, or otherwise obtain a command line override
(perhaps something like "watchdog=probe:10Hz")?

Jan


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