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Subject: Re: [PATCH 0/8] x86, acpi: Move acpi_initrd_override() earlier.
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Fri, 23 Aug 2013 16:24:06 +0200
To: Tejun Heo <tj@kernel.org>
CC: Toshi Kani <toshi.kani@hp.com>, Zhang Yanfei <zhangyanfei.yes@gmail.com>,
        Tang Chen <tangchen@cn.fujitsu.com>, konrad.wilk@oracle.com,
        robert.moore@intel.com, lv.zheng@intel.com, rjw@sisk.pl,
        lenb@kernel.org, tglx@linutronix.de, mingo@elte.hu,
        akpm@linux-foundation.org, trenn@suse.de, yinghai@kernel.org,
        jiang.liu@huawei.com, wency@cn.fujitsu.com, laijs@cn.fujitsu.com,
        isimatu.yasuaki@jp.fujitsu.com, izumi.taku@jp.fujitsu.com,
        mgorman@suse.de, minchan@kernel.org, mina86@mina86.com,
        gong.chen@linux.intel.com, vasilis.liaskovitis@profitbricks.com,
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        prarit@redhat.com, zhangyanfei@cn.fujitsu.com, yanghy@cn.fujitsu.com,
        x86@kernel.org, linux-doc@vger.kernel.org,
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Well... relying on MTRRs is a big cost in complexity and failure modes.

Tejun Heo <tj@kernel.org> wrote:
>Hello,
>
>On Fri, Aug 23, 2013 at 03:08:55PM +0200, H. Peter Anvin wrote:
>> What is the point of 1G+MTRR?  If there are caching differences the
>> TLB will fracture the pages anyway.
>
>Ah, right.  Consuming less memory / cachelines would still be a small
>advantage tho unless creating split TLB from larger mapping is
>noticeably less efficient.  If the extra logic to do that is small,
>which I think it'd be, it'd be a gain at almost no cost.
>
>Thanks.

-- 
Sent from my mobile phone. Please excuse brevity and lack of formatting.
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