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Re: [Xen-devel] xen-blkfront hang

On Mon, Jul 31, 2017 at 09:09:19AM +0800, Dongli Zhang wrote:
> To verify whether the above patch would help, please check the nr_grant_frames
> value in guest domU. If this value is exactly the same of maximum grant frames
> (by default, xen mainline uses 32) and the number of free grant references is
> very small, the above patch might help.

You are right, this is what I get after the machine hangs:

  crash> print nr_grant_frames 
  $1 = 32
  crash> print gnttab_free_count 
  $2 = 9

> The best way is to increase the gnttab_max_frames to larger value (e.g.,  256)
> in dom0 xen.gz grub.

Thank you, this seems to help.  The test machine does not hang now and
the numbers are looking better now:

  crash> print nr_grant_frames 
  $1 = 59
  crash> print gnttab_free_count 
  $2 = 356


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