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    SubjectRe: fio posixaio performance problem
    On 2011-8-3 12:06, Dave Chinner wrote:
    > 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?

    Ext4

    Thanks,
    Gui

    >
    > Cheers,
    >
    > Dave.




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