On Thu, 2015-09-24 at 19:28 +0200, Andreas Sundstrom wrote: > On 2015-09-23 16:18, Ian Campbell wrote: > > On Wed, 2015-09-23 at 12:47 +0000, Andreas Sundstrom wrote: > > > Citerar Ian Campbell <ian.campb...@citrix.com>: > > > > > > > Along those lines, if the _host_ has buckets of RAM then might it > > > > be > > > > worth > > > > restricting it in case the issue is with getting MFNs which are not > > > > representably by the 32-bit PV interfaces? (IIRC the limit is ~160G > > > > due > > > > to > > > > the size of the m2p hole, a 32-bit MFN spans 16TB so it's unlikely > > > > to > > > > be > > > > that). > > > > > > > > Likewise maybe the issue is with full addresses which don't fit in > > > > a 32 > > > > -bit > > > > number (which is maybe more likely to happen if grub uses a 1:1 > > > > mapping > > > > like I would guess it does), so limiting the host to <4GB might > > > > also be > > > > interesting? > > > > > > > > > > If this was meant for me I will need more information to understand > > > what to test. > > > dom0 has either 12G or 8G memory in my test machines if that makes a > > > difference. > > > > It was, sorry for not being clear. > > > > How much memory do the test machines have? > > > > If it is more than 160G then try booting with "mem=160G" on the > > hypervisor > > (not Linux) command line. You can just edit that in via grub. > > > > Then try with mem=4G (which might require shrinking dom0 too of > > course). > > Well as I said my test machines only have 12 and 8G of memory.
You said dom0 did, from which I wasn't able to tell how much RAM the host had, giving 12GB to dom0 on a 256G machine would be a plausible configuration. But this is a confusing distinction for many and I should have made that reasoning for including the 160G test clearer, sorry. > I did a quick test with mem=2G though just to be sure, it failed on > first attempt. OK, so it is unlikely to be any of the possible integer overflow type things I was thinking of then, thanks for testing. Ian. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel