Re: [win-pv-devel] How to diagnose windows domU hang on boot?

["G.R." <firemeteor@xxxxxxxxxxxxxxxxxxxxx>]

>> > So, I suggest you stick with dom0 backends but limit your storage to a 
>> > single
>> page ring. I can't remember the exact blkback module param you need to set
>> to do that, but it shouldn't be hard to find.
>> >
>> I'm not sure I understand what you mean by 'mutipage rings'. Must
>> refer to something internal which is not mentioned in the doc:
>> http://xenbits.xen.org/docs/4.8-testing/misc/xl-disk-configuration.txt
>
> No. I'm referring to the blkback feature. See 
> https://lkml.org/lkml/2015/6/3/25
>
> I suggest you blkback's max_ring_page_order parameter to 0, because I think 
> it is currently defaulting to 4... which is stupidly large for most use-cases.

Just would like to report back that this trick really fixed the issue.
Thank you so much for your help!!!
(I'm currently using 2 instead of 0, may do some further tweaking).

One thing I'm curious is that why all other PV drivers (those in linux
/ freebsd, and old windows gpl pv) are working just fine, while this
new windows driver suffers?
It's really not user friendly for the default config value to behave badly.
Is there anything we can do to make it better? Either to propose a
more reasonable default or make it more tolerant in the new windows pv
driver?

Thanks,
Rui

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