iowait

Discussion in 'General Linux' started by david.fu, May 20, 2014.

  1. david.fu

    david.fu New Member

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    embedded linux,rootfs:jffs2,ext3 filesystem for sd card ,the iowait 99% and application hang up some day after run .why reason cause?thanks very much!

    #echo 1 > /proc/sys/vm/block_dump
    #dmesg |awk -F " " '{print $2}'|sort|uniq -c|sort -rn|head -n 100
    259 on
    259 inode
    259 dirtied
    254 p
    254 mmcblk
    254 flush


    #top
    Mem: 251480K used, 3660K free, 0K shrd, 48652K buff, 146432K cached
    CPU: 0.3% usr 0.7% sys 0.0% nic 0.0% idle 98.8% io 0.0% irq 0.0% sirq
    Load average: 4.04 4.03 4.05 1/83 6861

    208 2 root SW 0 0.0 0 0.0 [kworker/0:1]
    447 2 root DW 0 0.0 0 0.0 [mmcqd/0]
    6 2 root SW 0 0.0 0 0.0 [rcu_kthread]
    460 2 root SWN 0 0.0 0 0.0 [jffs2_gcd_mtd2]
    468 2 root DW 0 0.0 0 0.0 [kjournald]
    5 2 root DW 0 0.0 0 0.0 [kworker/u:0]

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