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Message-ID: <aGYM6uQkFAtdqMs9@yzhao56-desk.sh.intel.com>
Date: Thu, 3 Jul 2025 12:54:02 +0800
From: Yan Zhao <yan.y.zhao@...el.com>
To: Ackerley Tng <ackerleytng@...gle.com>
CC: Vishal Annapurve <vannapurve@...gle.com>, "Edgecombe, Rick P"
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Subject: Re: [RFC PATCH 08/21] KVM: TDX: Increase/decrease folio ref for huge
pages
On Wed, Jul 02, 2025 at 11:43:23AM -0700, Ackerley Tng wrote:
> >> vmemmap-optimized folios. Setting a page flag on a vmemmap-optimized
> >> folio will be setting the flag on a few pages.
> > BTW, I have a concern regarding to the overhead vmemmap-optimization.
> >
> > In my system,
> > with hugetlb_free_vmemmap=false, the TD boot time is around 30s;
> > with hugetlb_free_vmemmap=true, the TD boot time is around 1m20s;
>
> I'm aware of this, was investigating this for something similar
> internally. In your system and test, were you working with 1G pages, or
> 2M pages?
2M pages.
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