On Wed, Oct 31, 2018 at 05:07 PM +0200, Roger Pau Monné wrote:
On Wed, Oct 31, 2018 at 04:38:08PM +0200, Alexandru Vasile wrote:
> Hello,
>
>
> > I am writing as a follow up from our discussion on the xen-devel
mailing
> > list [0].
> >
> You mentioned some ‘low-hanging fruit, both in Xen and the Linux
kernel’ and
> > if I am ever interested to talk about sharing the workload.
> >
> Could you share more details about this?
- Xen: make sure PVH Dom0 works without the dom0_mem parameter. There
have been reports that the initial memory accounting for Xen and
Dom0 is bogus for a PVH Dom0 depending on the host amount of RAM
and other factors. This will involve testing PVH Dom0 on several
boxes without the dom0_mem parameter and coming up with a better
algorithm to calculate the amount of memory required by Xen and
Dom0. Changes will be mostly limited to the dom0_compute_nr_pages
and dom0_paging_pages functions I expect.
- Linux: there are issues in the way Linux maps foreign memory and
grants when running in PVH mode. AFAIK Linux will balloon out RAM
and use the freed range in order to map foreign memory or grants.
This can cause out of memory issues if there are enough mappings,
and also decreases the RAM available to Dom0 for no reason.
Solving this issue requires an analysis of the problem and drafting
a document that describes the solution before implementing it, as
it's slightly tricky. This document would be sent to xen-devel for
review and opinions.
[0]
https://lists.xenproject.org/archives/html/xen-devel/2018-10/msg01580.html
Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. Lazar
Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. Registered in
Romania. Registration number J22/2621/2005.
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