Hans van Kranenburg, le lun. 11 févr. 2019 22:59:11 +0100, a ecrit: > On 2/11/19 2:37 AM, Dongli Zhang wrote: > > > > On 2/10/19 12:35 AM, Samuel Thibault wrote: > >> > >> Hans van Kranenburg, le sam. 09 févr. 2019 17:01:55 +0100, a ecrit: > >>>> I have forwarded the original mail: all VM I/O get stuck, and thus the > >>>> VM becomes unusable. > >>> > >>> These are in many cases the symptoms of running out of "grant frames". > >> > >> Oh! That could be it indeed. I'm wondering what could be monopolizing > >> them, though, and why +deb9u11 is affected while +deb9u10 is not. I'm > >> afraid increasing the gnttab max size to 32 might just defer filling it > >> up. > >> > >>> -# ./xen-diag gnttab_query_size 5 > >>> domid=5: nr_frames=11, max_nr_frames=32 > >> > >> The current value is 31 over max 32 indeed. > > > > Assuming this is grant v1, there are still 4096/8=512 grant references > > available > > (32-31=1 frame available). I do not think the I/O hang can be affected by > > the > > lack of grant entry. > > I suspect that 31 measurement was taken when the domU was not hanging yet.
Indeed, I didn't have the hanging VM offhand. I have looked again, it's now at 33. We'll have to monitor to check that it doesn't continue just increasing. Samuel _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel