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    SubjectRe: [RFC] Limit the size of the pagecache
    On Fri, 26 Jan 2007 02:29:55 -0800
    Andrew Morton <akpm@osdl.org> wrote:

    > On Wed, 24 Jan 2007 14:15:10 +0900
    > KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
    >
    > > - One for stability
    > > When a customer constructs their detabase(Oracle), the system often goes to oom.
    > > This is because that the system cannot allocate DMA_ZOME memory for 32bit device.
    > > (USB or e100)
    > > Not allowing to use almost all pages as page cache (for temporal use) will be some help.
    > > (Note: construction DB on ext3....so all writes are serialized and the system couldn't
    > > free page cache.)
    >
    > I'm surprised that any reasonable driver has a dependency on ZONE_DMA. Are
    > you sure? Send full oom-killer output, please.
    >
    >
    Our ia64 server's USB/e100 device uses 32bit-PCI, so sometimes OOM happens on DMA zone.
    (ia64's ZONE_DMA is 0-4G area.)

    But very sorry....I was confused.

    I looked the issue above again and found ZONE_NORMAL/x86 was exhausted.

    This was interesiting incident,

    Constructing DB on 4Gb system has no problem.
    Constructing DB on 8Gb system always causes OOM.

    I asked the users to change DB's parameter. (this happened on RHEL4/linux-2.6.9 series)


    > > And...some customers want to keep memory Free as much as possible.
    > > 99% memory usage makes insecure them ;)
    >
    > Tell them to do "echo 3 > /proc/sys/vm/drop_caches", then wait three minutes?

    Ah, maybe we can use it on RHEL5. We'll test it. thank you.

    Thanks,
    -Kamezawa



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