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

[Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>]

On 07/02/18 13:08, Jan Beulich wrote:
>>>> On 07.02.18 at 14:01, <igor.druzhinin@xxxxxxxxxx> wrote:
>> So far the issue confirmed:
>> Dell PowerEdge R740, Huawei systems based on Xeon Gold 6152 (the one
>> that it was tested on), Intel S2600XX, etc.
>>
>> Also see:
>> https://bugs.xenserver.org/browse/XSO-774 
>>
>> Well, no-watchdog is what we currently recommend in that case but we
>> hoped there is a general solution here from Xen side. You have your
>> point that they should fix this on their side because it's their fault
>> indeed. But the user experience is also important for us I think.
> 
> Of course, hence the suggestion of possible alternative workarounds.
> Impacting everyone is, as said, not a desirable approach in a case
> like this one. I also continue to dislike the seemingly random division
> by 10.
> 
> Jan
> 

There is also a workaround by initializing the watchdog later (after SMP
bootstrap) on CPU0 - as Linux does AFAIK. But I don't think this would
be acceptable either.

Igor

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