[Xen-devel]Is 7G memory good enough for current PAE HVM guest

["Xin, Xiaohui" <xiaohui.xin@xxxxxxxxx>]

Some background:

We are now debugging the Qemu map cache issue for HVM PAE guest on PAE host.

 

We found that a hardcode limit for shadow2 which we can only support about 7G memory for HVM PAE guest.

With the attached workaround and the Qemu map cache patch, we can now support almost 16G memory PAE guest.

But it does of course decrease the virtual address space which Xen can map.

So it is a question now: Is 7G memory good enough for current PAE HVM guest?

And by the way, if a guest requests too much memory, Xen should check it first before creation.

 

 

Thanks

Xiaohui/Dexuan  

Attachment: 15Gmem.diff
Description: 15Gmem.diff

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