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

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Subject:	[Xen-devel]Is 7G memory good enough for current PAE HVM guest
From:	"Xin, Xiaohui" <xiaohui.xin@xxxxxxxxx>
Date:	Fri, 1 Dec 2006 14:08:24 +0800
Cc:	"Mallick, Asit K" <asit.k.mallick@xxxxxxxxx>, "Li, Susie" <susie.li@xxxxxxxxx>, "Li, Xin B" <xin.b.li@xxxxxxxxx>, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>
Delivery-date:	Thu, 30 Nov 2006 22:08:32 -0800
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Thread-topic:	[Xen-devel]Is 7G memory good enough for current PAE HVM guest

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

15Gmem.diff
Description: 15Gmem.diff

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