Messages in this thread | | | From | Badari Pulavarty <> | Subject | Re: More Testing with 4000 disks | Date | Mon, 7 Apr 2003 14:32:08 -0800 |
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On Monday 07 April 2003 02:15 pm, Andrew Morton wrote: > 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.
Machine is: 8x 900MHz P-III 4GB RAM
> > How come? > > What context switch rate and profile were you getting when performing IO > against a large number of real disks?
I have only 50 real disks. I can get info on these.
Thanks, Badari
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