Messages in this thread | | | Date | Mon, 7 Apr 2003 14:15:51 -0700 | From | Andrew Morton <> | Subject | Re: More Testing with 4000 disks |
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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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