Re: 2.6.11: iostat values broken ?

[Andrew Morton]

"Miquel van Smoorenburg" <miquels@xxxxxxxxxx> wrote:
>
> I just upgrades one of our newsservers from 2.6.9 to 2.6.11. I
> use "iostat -k -x 2" to see live how busy the disks are. But
> I don't believe that Linux optimizes things so much that a disk
> can be 1849.55% busy :)
> 
> (you'll have to stretch out your xterm to be able to read this):
> 
> Device:    rrqm/s wrqm/s   r/s   w/s  rsec/s  wsec/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await  svctm  %util
> hda          0.00  50.00  0.00 18.18    0.00  545.45     0.00   272.73    30.00     2.35  129.00  86.25 156.82
> hdc          0.00  45.45 77.27 31.82 3927.27  618.18  1963.64   309.09    41.67     6.27   57.42  38.42 419.09
> hdd          4.55   0.00 63.64  0.00   68.18    0.00    34.09     0.00     1.07     1.11   17.43  17.43 110.91
> hde        477.27   0.00 45.45  0.00  522.73    0.00   261.36     0.00    11.50     0.40    8.90   8.90  40.45
> hdg         18.18 70154.55 22.73 172.73   40.91 70727.27    20.45 35363.64   362.07  1010.36 1127.72  94.63 1849.55
> 
> With 2.6.9, %util never came above 100% (and that was indeed "fully loaded".
> I have systems with a comparable load running 2.6.10 and 2.6.11-rc3-bk4
> that also don't show this behaviour (but those are SCSI, not IDE).
> 
> I use CFQ, but changing that to deadline doesn't make a difference.
> 

Mike, did you ever get to the bottom of this?  Still happening in 2.6.12-rc1?
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