From: Yinghai Lu <yinghai@kernel.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>,
Matthew Wilcox <matthew@wil.cx>,
linux-pci@vger.kernel.org,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/3] pci: don't assume pref memio are 64bit -v2
Date: Sat, 18 Apr 2009 10:01:58 -0700 [thread overview]
Message-ID: <49EA0786.1090503@kernel.org> (raw)
In-Reply-To: <20090418091509.GM7678@elte.hu>
Ingo Molnar wrote:
> * Yinghai Lu <yinghai@kernel.org> wrote:
>
>> one system with 4g installed ( there is 1g hole)
>>
>> when 4G installed.
>> BIOS put ACPI etc need the hole
>> [ 0.000000] BIOS-provided physical RAM map:
>> [ 0.000000] BIOS-e820: 0000000000000000 - 000000000009bc00 (usable)
>> [ 0.000000] BIOS-e820: 000000000009bc00 - 00000000000a0000 (reserved)
>> [ 0.000000] BIOS-e820: 00000000000e3000 - 0000000000100000 (reserved)
>> [ 0.000000] BIOS-e820: 0000000000100000 - 00000000bffa0000 (usable)
>> [ 0.000000] BIOS-e820: 00000000bffa0000 - 00000000bffae000 (ACPI data)
>> [ 0.000000] BIOS-e820: 00000000bffae000 - 00000000bfff0000 (ACPI NVS)
>> [ 0.000000] BIOS-e820: 00000000bfff0000 - 00000000c0000000 (reserved)
>> [ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
>> [ 0.000000] BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved)
>> [ 0.000000] BIOS-e820: 0000000100000000 - 0000000140000000 (usable)
>> so in kernel resource will be reserved for 0xbffa0000 - 0xbfff0000 for ACPI
>> 0x100000 - 0xbffa0000 for RAM...
>
> btw., sidenote, it would be nice to enhance the e820 table printout
> with size and hole info as well. I did this manually yesterday in
> another mail:
>
> BIOS-provided physical RAM map:
> BIOS-e820: 0000000000000000 - 000000000009fc00 (usable) 0.639 MB RAM
> BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved) 0.001 MB
> [ hole ] 0.250 MB
> BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved) 0.125 MB
> BIOS-e820: 0000000000100000 - 000000003ed94000 (usable) 1004.5 MB RAM
> BIOS-e820: 000000003ed94000 - 000000003ee4e000 (ACPI NVS) 0.7 MB
> BIOS-e820: 000000003ee4e000 - 000000003fea2000 (usable) 16.3 MB RAM
> BIOS-e820: 000000003fea2000 - 000000003fee9000 (ACPI NVS) 0.3 MB
> BIOS-e820: 000000003fee9000 - 000000003feed000 (usable) 0.15 MB RAM
> BIOS-e820: 000000003feed000 - 000000003feff000 (ACPI data 0.07 MB
> BIOS-e820: 000000003feff000 - 000000003ff00000 (usable) 0.004 MB RAM
> [ hole ] 1.0 MB
> [ hole ] 3072.0 MB
>
> it would be extremely useful to have that in the printout, to see
> the physical address space layout at a glance. Small holes are easy
> to miss, and e820 entry sizes are hard to judge at a glance.
>
> To make this fit well, i'd suggest to drop the 'BIOS-e820: ' prefix
> - it's redundant.
will look at it. and should be another patch for x86.
YH
next prev parent reply other threads:[~2009-04-18 17:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-18 8:43 [PATCH 1/3] x86/pci: fix -1 calling to e820_all_mapped with mmconfig Yinghai Lu
2009-04-18 8:44 ` [PATCH 2/3] pci: don't assume pref memio are 64bit -v2 Yinghai Lu
2009-04-18 9:15 ` Ingo Molnar
2009-04-18 17:01 ` Yinghai Lu [this message]
2009-04-18 20:09 ` Ivan Kokshaysky
2009-04-18 20:25 ` Ingo Molnar
2009-04-18 8:46 ` [PATCH 3/3] pci: don't printout if the bus res size is 0 Yinghai Lu
2009-04-18 9:16 ` Ingo Molnar
2009-04-18 9:17 ` [PATCH 1/3] x86/pci: fix -1 calling to e820_all_mapped with mmconfig Ingo Molnar
2009-04-22 22:04 ` Jesse Barnes
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=49EA0786.1090503@kernel.org \
--to=yinghai@kernel.org \
--cc=jbarnes@virtuousgeek.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=matthew@wil.cx \
--cc=mingo@elte.hu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.