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SubjectRe: 2.6.11: iostat values broken ?
"Miquel van Smoorenburg" <miquels@cistron.nl> 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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