Badari Pulavarty <pbadari@us.ibm.com> wrote:
>
> Hi,
>
> Here is more on testing with simulated 4000 disks.
>
> I mounted 4000 simulated (scsi_debug) disks. But
> when I tried to do IO on 200 of them (just reads),
> system is 100% busy. Here are the vmstat,
> 10-sec profile output and sysrq-t output.
>
> I am wondering why 100% sys ?
>
This doesn't make sense. You're showing 50% CPU time in schedule(), yet the
(undescribed) machine is doing only 11k context switches/sec.
How come?
What context switch rate and profile were you getting when performing IO against a
large number of real disks?
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This archive was generated by hypermail 2b29 : Mon Apr 07 2003 - 22:00:32 EST