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Subject: too big min_free_kbytes
From: Shaohua Li <shaohua.li@intel.com>
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Date: Mon, 24 Jan 2011 11:56:46 +0800
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To: Andrew Morton <akpm@linux-foundation.org>, aarcange@redhat.com
Cc: linux-mm <linux-mm@kvack.org>, "Chen, Tim C" <tim.c.chen@intel.com>
List-ID: <linux-mm.kvack.org>

Hi,
With transparent huge page, min_free_kbytes is set too big.
Before:
Node 0, zone    DMA32
  pages free     1812
        min      1424
        low      1780
        high     2136
        scanned  0
        spanned  519168
        present  511496

After:
Node 0, zone    DMA32
  pages free     482708
        min      11178
        low      13972
        high     16767
        scanned  0
        spanned  519168
        present  511496
This caused different performance problems in our test. I wonder why we
set the value so big.

Thanks,
Shaohua

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