From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: MaoXiaoyun <tinnycloud@hotmail.com>
Cc: jeremy@goop.org, xen devel <xen-devel@lists.xensource.com>
Subject: Re: RE:2Gb Memory lost in 2.6.32.36 - 50G memory, maxmem=50G, 2G used for pagetable.
Date: Thu, 19 May 2011 10:42:42 -0400 [thread overview]
Message-ID: <20110519144242.GC9854@dumpdata.com> (raw)
In-Reply-To: <BLU157-w1E33BE64D768511906790DA8E0@phx.gbl>
> 4) Compare the boot log between kernel 10 and 36, I noticed something different, they have different last_pfn.
>
> ===below is 36====
> Xen: 0000000000000000 - 000000000009a000 (usable)
> Xen: 000000000009a400 - 0000000000100000 (reserved)
> Xen: 0000000000100000 - 00000000bf790000 (usable)
> Xen: 00000000bf790000 - 00000000bf79e000 (ACPI data)
> Xen: 00000000bf79e000 - 00000000bf7d0000 (ACPI NVS)
> Xen: 00000000bf7d0000 - 00000000bf7e0000 (reserved)
> Xen: 00000000bf7ec000 - 00000000c0000000 (reserved)
> Xen: 00000000e0000000 - 00000000f0000000 (reserved)
> Xen: 00000000fec00000 - 00000000fec01000 (reserved)
> Xen: 00000000fec8a000 - 00000000fec8b000 (reserved)
> Xen: 00000000fee00000 - 00000000fee01000 (reserved)
> Xen: 00000000fff00000 - 0000000100000000 (reserved)
> Xen: 0000000100000000 - 0000000c6ff09000 (usable)
Ok, C6FF09-100000 is 46GB
> DMI present.
> AMI BIOS detected: BIOS may corrupt low RAM, working around it.
> last_pfn = 0xc6ff09 max_arch_pfn = 0x400000000
> last_pfn = 0xbf790 max_arch_pfn = 0x400000000
>
> =========below is 10
>
> Xen: 0000000000000000 - 000000000009a400 (usable)
> Xen: 000000000009a400 - 0000000000100000 (reserved)
> Xen: 0000000000100000 - 00000000bf790000 (usable)
> Xen: 00000000bf790000 - 00000000bf79e000 (ACPI data)
> Xen: 00000000bf79e000 - 00000000bf7d0000 (ACPI NVS)
> Xen: 00000000bf7d0000 - 00000000bf7e0000 (reserved)
> Xen: 00000000bf7ec000 - 00000000c0000000 (reserved)
> Xen: 00000000e0000000 - 00000000f0000000 (reserved)
> Xen: 00000000fec00000 - 00000000fec01000 (reserved)
> Xen: 00000000fec8a000 - 00000000fec8b000 (reserved)
> Xen: 00000000fee00000 - 00000000fee01000 (reserved)
> Xen: 00000000fff00000 - 0000000100000000 (reserved)
> Xen: 0000000100000000 - 000000015fe00000 (usable)
And, 15FE00-100000 = 392704*4K/1K/1K = 1534MB = 1.5G
> DMI present.
> AMI BIOS detected: BIOS may corrupt low RAM, working around it.
> last_pfn = 0x15fe00 max_arch_pfn = 0x400000000
> last_pfn = 0xbf790 max_arch_pfn = 0x400000000
>
So the problem looks as the .36 is creating a pagetable for the
memory above the 5G you provided - which sounds correct as
you gave it 5G and the expectation that it can balloon up to 50G.
What happens if you provide dom0_mem=max:5G to clamp on the size?
next prev parent reply other threads:[~2011-05-19 14:42 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <SNT0-MC4-F34MpzkUY6002755b8@snt0-mc4-f34.Snt0.hotmail.com>
2011-05-18 14:58 ` Memory missing in 2.6.32.36 MaoXiaoyun
2011-05-19 3:58 ` MaoXiaoyun
2011-05-19 5:30 ` MaoXiaoyun
2011-05-19 13:17 ` RE:2Gb Memory lost " MaoXiaoyun
2011-05-19 14:42 ` Konrad Rzeszutek Wilk [this message]
2011-05-19 15:31 ` RE:2Gb Memory lost in 2.6.32.36 - 50G memory, maxmem=50G, 2G used for pagetable MaoXiaoyun
2011-05-19 16:16 ` RE:2Gb Memory lost in 2.6.32.36 - 50G memory, maxmem=50G, 2G used for pagetable, clamping (max:5G) is not helping Konrad Rzeszutek Wilk
2011-05-25 9:08 ` MaoXiaoyun
2011-05-31 8:33 ` MaoXiaoyun
2011-05-31 14:44 ` Konrad Rzeszutek Wilk
2011-05-19 14:44 ` 2Gb Memory lost in 2.6.32.36 Konrad Rzeszutek Wilk
2011-05-19 15:32 ` MaoXiaoyun
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