Re: [win-pv-devel] Windows 10 domU is unstable with PV Bus Driver

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Michel D'HOOGE [mailto:michel.dhooge@xxxxxxxxx]
> Sent: 15 December 2017 12:41
> To: Paul Durrant <Paul.Durrant@xxxxxxxxxx>
> Cc: win-pv-devel@xxxxxxxxxxxxxxxxxxxx
> Subject: Re: [win-pv-devel] Windows 10 domU is unstable with PV Bus Driver
> 
> Paul,
> 
> >   The problem is not necessarily xenvbd per se; it is trying to make full 
> > use
> > of your backend's capability. I can only assume things worked for you
> before
> > the frontend update because you were getting close to the limit but not
> quite
> > exceeding it (because of timing or the frontends not trying to fill the 
> > rings
> so
> > much). There is the possibility of a reference leak though so could you try
> > increasing your grant frame limit again and see if things stabilise?
> 
> 
> So I increased to 380, and it seems to be OK:
> The logs filled up to 174 and then stopped. And the domU is still
> operating properly!

Cool. Probably best to check back after a while and make sure it hasn't gone up 
from 174 after a reasonable amount of use to try to spot any potential leak 
before it actually takes your VM down.

> 
> ---
> GNTTAB: MAP XENMAPSPACE_grant_table[171] @ 00000000.f20ac000
> XENBUS|GnttabExpand: added references [00015600 - 000157ff]
> XENBUS|RangeSetPop: fail2
> XENBUS|RangeSetPop: fail1 (c000009a)
> GNTTAB: MAP XENMAPSPACE_grant_table[172] @ 00000000.f20ad000
> XENBUS|GnttabExpand: added references [00015800 - 000159ff]
> XENBUS|RangeSetPop: fail2
> XENBUS|RangeSetPop: fail1 (c000009a)
> GNTTAB: MAP XENMAPSPACE_grant_table[173] @ 00000000.f20ae000
> XENBUS|GnttabExpand: added references [00015a00 - 00015bff]
> XENBUS|RangeSetPop: fail2
> XENBUS|RangeSetPop: fail1 (c000009a)
> GNTTAB: MAP XENMAPSPACE_grant_table[174] @ 00000000.f20af000
> XENBUS|GnttabExpand: added references [00015c00 - 00015dff]
> ---
> 
> As soon as I have more time, I'll try to understand this Grant Table
> thing. But right now, I just want to use my domU! ;-)

Fair enough. 174 frames is a massive number of grants; I'm surprised the VM 
wants to use that many. How many PV network and storage interfaces so you have 
(and how many vcpus in your guest)?

> 
> Thanks again

No probs.

Cheers,

  Paul

> Michel
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