From: Keir Fraser <keir.fraser@eu.citrix.com>
To: "Xu, Dongxiao" <dongxiao.xu@intel.com>,
"'xen-devel@lists.xensource.com'" <xen-devel@lists.xensource.com>
Cc: "Huang2, Wei" <Wei.Huang2@amd.com>
Subject: Re: [PATCH][1/4] Enable 1GB for Xen HVM host page
Date: Wed, 24 Feb 2010 09:12:04 +0000 [thread overview]
Message-ID: <C7AA9DE4.B1FE%keir.fraser@eu.citrix.com> (raw)
In-Reply-To: <6CADD16F56BC954D8E28F3836FA7ED71282AC1EF1A@shzsmsx501.ccr.corp.intel.com>
On 24/02/2010 04:25, "Xu, Dongxiao" <dongxiao.xu@intel.com> wrote:
> When allocating guest memory without the patch, Xend will treat 3G-4G
> as normal memory, ignoring the 3.75-4G MMIO hole. This patch modifies
> MMIO start address to be 1GB aligned and could fix the issue.
>
> Indeed, this patch may have some influence to pure 32bit guest,
> changing its max memory from 3.75G to 3G.
>
> Anyway, we can change it to alloc 2M pages between 3G and 4G if you
> think this particular patch is improper.
I would expect it to fall back to 2MB extents, and from there back to 4kB
extents as necessary, for any range where: (a) the range to be allocated for
is not 1GB-sized and -aligned; or (b) no 1GB extents are available from
Xen's free pool.
-- Keir
prev parent reply other threads:[~2010-02-24 9:12 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-22 17:17 [PATCH][1/4] Enable 1GB for Xen HVM host page Wei Huang
2010-02-23 7:56 ` Keir Fraser
2010-02-23 15:03 ` Huang2, Wei
2010-02-24 4:25 ` Xu, Dongxiao
2010-02-24 9:12 ` Keir Fraser [this message]
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