On Wed, Jan 26, 2005 at 10:13:22PM +0200, Michael S. Tsirkin wrote:
> Its not the speed of hardware, my problem is the variations.
Ok. Your "log comment" was entirely misleading. It should read
I can't measure a performance difference becuase of my
test results vary by X%.
Substitute the right value for X.
> > Did you see the difference in IPoIB numbers that I posted
> > earlier where I pegged the test processes to the same CPU
> > taking interrupts or a different CPU?
>
> No - link?
Sorry - I don't have the URL - just the original mail.
I posted this on "Date: Thu, 13 Jan 2005 10:43:34 -0800"
and you should be able to find this in the archives.
Here is the table again:
netperf/irq same, netserver/irq same: 1591 Mbps
netperf/irq diff, netserver/irq same: 1565 Mbps
netperf/irq same, netserver/irq diff: 1507 Mbps
netperf/irq diff, netserver/irq diff: 1510 Mbps
(1591-1510)/1510 is about 5%.
If you use taskset on your platforms, run a similar table to the
above, we could compare and see if ia64 is more sensitive to this
than other arches.
hth,
grant
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