From: Yinghai Lu <yinghai@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>, David Miller <davem@davemloft.net>,
"H. Peter Anvin" <hpa@zytor.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH - resend] memblock: Don't adjust size in memblock_find_base()
Date: Thu, 03 Feb 2011 12:37:40 -0800 [thread overview]
Message-ID: <4D4B1214.20603@kernel.org> (raw)
In-Reply-To: <20110203122505.8369330f.akpm@linux-foundation.org>
On 02/03/2011 12:25 PM, Andrew Morton wrote:
> On Fri, 28 Jan 2011 16:37:47 -0800
> Yinghai Lu <yinghai@kernel.org> wrote:
>
>>
>> While applying patch to use memblock to find aperture for 64bit x86.
>> Ingo found system with 1g + force_iommu
>>
>>> No AGP bridge found
>>> Node 0: aperture @ 38000000 size 32 MB
>>> Aperture pointing to e820 RAM. Ignoring.
>>> Your BIOS doesn't leave a aperture memory hole
>>> Please enable the IOMMU option in the BIOS setup
>>> This costs you 64 MB of RAM
>>> Cannot allocate aperture memory hole (0,65536K)
>
> I'm trying to work out if we should backport this fix into earlier
> kernels and as is often the case, I wasn't given enough information.
>
> What are the end-user visible effects of this? The kernel cannot use
> the AGP bridge? 64MB of RAM wasted? Something else?
that is needed for further cleanup memblock with x86.
http://git.kernel.org/?p=linux/kernel/git/tip/linux-2.6-tip.git;a=shortlog;h=refs/heads/x86/bootmem
but it triggers another old bug in core memblock on one Ingo test machine. (with 1g ram but have iommu forced set for debug)
end-user is not supposed to have this conf.
Thanks
Yinghai
next prev parent reply other threads:[~2011-02-03 20:38 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-18 0:58 [PATCH 0/3] memblock related top down Yinghai Lu
2010-12-28 0:47 ` [PATCH 0/6] memblock related further cleanup for x86 Yinghai Lu
[not found] ` <4D19320B.7030007@kernel.org>
2010-12-28 0:47 ` [PATCH 1/6] x86: Change get_max_mapped() to inline Yinghai Lu
2010-12-29 23:05 ` H. Peter Anvin
2010-12-29 23:30 ` Yinghai Lu
2010-12-29 23:37 ` Yinghai Lu
2010-12-29 23:42 ` H. Peter Anvin
2010-12-29 23:45 ` [PATCH -v2 " Yinghai Lu
2011-02-16 8:50 ` [tip:x86/mm] " tip-bot for Yinghai Lu
2010-12-28 0:48 ` [PATCH 2/6] x86, 64bit, numa: Allocate memnodemap under max_pfn_mapped Yinghai Lu
2011-02-16 8:50 ` [tip:x86/mm] x86-64, " tip-bot for Yinghai Lu
2010-12-28 0:48 ` [PATCH 3/6] x86, 64bit, numa: Put pgtable to local node memory Yinghai Lu
2010-12-29 23:46 ` [PATCH -v2 " Yinghai Lu
2010-12-29 23:50 ` H. Peter Anvin
2010-12-30 0:11 ` Yinghai Lu
2010-12-30 0:39 ` David Rientjes
2010-12-30 0:58 ` H. Peter Anvin
2010-12-30 1:07 ` David Rientjes
2010-12-30 1:53 ` H. Peter Anvin
2010-12-30 9:06 ` Ingo Molnar
2010-12-30 10:28 ` [boot crash] " Ingo Molnar
2010-12-30 10:30 ` Ingo Molnar
2010-12-30 12:01 ` [build failure] " Ingo Molnar
2010-12-30 18:53 ` David Rientjes
2010-12-30 18:54 ` [patch] x86, numa: Fix CONFIG_DEBUG_PER_CPU_MAPS without NUMA emulation David Rientjes
2011-01-06 20:39 ` David Rientjes
2011-01-06 21:25 ` Yinghai Lu
2011-01-06 23:58 ` David Rientjes
2011-01-07 15:32 ` [tip:x86/numa] " tip-bot for David Rientjes
2010-12-30 21:18 ` [boot crash] Re: [PATCH -v2 3/6] x86, 64bit, numa: Put pgtable to local node memory Yinghai Lu
[not found] ` <AANLkTimpyRXS9dNFATh4GqtA46uynutAvK7Qb5S7WPFO@mail.gmail.com>
[not found] ` <20110105134434.GA22816@elte.hu>
2011-01-05 21:24 ` Yinghai Lu
2011-01-07 20:41 ` [PATCH] memblock: Don't adjust size in memblock_find_base() Yinghai Lu
2011-01-10 5:56 ` Benjamin Herrenschmidt
2011-01-10 6:59 ` Yinghai Lu
2011-01-12 1:35 ` Yinghai Lu
2011-01-29 0:37 ` [PATCH - resend] " Yinghai Lu
2011-02-03 20:25 ` Andrew Morton
2011-02-03 20:37 ` Yinghai Lu [this message]
2011-02-16 8:51 ` [tip:x86/mm] x86-64, numa: Put pgtable to local node memory tip-bot for Yinghai Lu
2010-12-28 0:48 ` [PATCH 4/6] x86: Use early pre-allocated page table buffer top-down Yinghai Lu
2010-12-28 0:48 ` [PATCH 5/6] x86, 64bit: Move out cleanup higmap [_brk_end, _end) out of init_memory_mapping() Yinghai Lu
2011-02-16 8:51 ` [tip:x86/mm] x86-64: " tip-bot for Yinghai Lu
2010-12-28 0:48 ` [PATCH 6/6] x86: Rename e820_table_* to pgt_buf_* Yinghai Lu
2010-12-30 21:54 ` [PATCH -v2 " Yinghai Lu
2010-12-28 20:21 ` [PATCH 0/3] memblock related top down H. Peter Anvin
2010-12-28 21:36 ` Yinghai Lu
2010-12-28 22:09 ` H. Peter Anvin
2010-12-28 22:25 ` Yinghai Lu
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