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    SubjectRe: fio posixaio performance problem
    On Wed, Aug 03, 2011 at 11:40:04AM +0800, Gui Jianfeng wrote:
    > Hi,
    >
    > I ran a fio test to simulate qemu-kvm io behaviour.
    > When job number is greater than 2, IO performance is
    > really bad.
    >
    > 1 thread: aggrb=15,129KB/s
    > 4 thread: aggrb=1,049KB/s
    >
    > Kernel: lastest upstream
    >
    > Any idea?
    >
    > ---
    > [global]
    > runtime=30
    > time_based=1
    > size=1G
    > group_reporting=1
    > ioengine=posixaio
    > exec_prerun='echo 3 > /proc/sys/vm/drop_caches'
    > thread=1
    >
    > [kvmio-1]
    > description=kvmio-1
    > numjobs=4
    > rw=write
    > bs=4k
    > direct=1
    > filename=/mnt/sda4/1G.img

    What filesystem?

    Cheers,

    Dave.
    --
    Dave Chinner
    david@fromorbit.com


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