iowait

D

david.fu

Guest
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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