Messages in this thread | | | Date | Mon, 10 Nov 2008 15:34:59 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes |
| |
Alexander van Heukelum wrote: > > I did the rdtsctest again for the irqstubs patch you sent. The data > is at http://heukelum.fastmail.fm/irqstubs/ and the latency histogram > is http://heukelum.fastmail.fm/irqstubs/latency_hpa.png >
Okay, I've stared at a bunch of different transformations of this data and I'm starting to think that it's getting lost in the noise. The difference between your "idleticks" and "idleticks2" data sets, for example, is as big as the differences between any two data sets that I can see.
Just for reference, see this graph where I have filtered out events outside the [30..1000] cycle range and renormalized.
http://www.zytor.com/~hpa/hist.pdf
I don't know how to even figure out what a realistic error range looks like, other than repeating each run something like 100+ times and do an "eye chart" kind of diagram.
-hpa
| |