On 07/06/2013 16:17, unruh wrote:
On 2013-06-07, David Taylor <[email protected]> wrote:
On 06/06/2013 20:17, Doug Calvert wrote:
unruh has a nice page about interrupt coalescing:
http://axion.physics.ubc.ca/scatter/rt.html
This is a quite interesting note, unfortunately rendered rather less
useful by the graphs, which have no axis names or units marked, and
which appear to have inconsistent scales (although this may simply be
lack of legibility). For example:
http://axion.physics.ubc.ca/scatter/rtdt1.gif
The units on the vertical axis appear to be labelled:
-0.0001 -5x10-6 0 5x10-6 0.0001
Yes, supermongo, the plotting program, does tend to make 5 and 6 similar
at the small sizes used in superscripts. But as you say, it is a linear
scale, and thus that must be a 5 rather than a 6.
which I interpret as -100us, -5 us, 0, +5us +100us, but it appears to
Since that is, as you point out, an interpretation that produces silly
results, it is probably the interpretation that is at fault.
be a linear axis. Is the 5x10-6 supposed to be 5x10-5? The character
needs serious improvement as it looks like 5x10-6 to me. But in any
case, as microseconds are referred to in the text, would it not be a lot
clearer if the graphs were also in microseconds, rather than some small
fraction of seconds?
Similar problems in:
http://axion.physics.ubc.ca/scatter/gps.gif
where the -5 and -6 suffices are very difficult to distinguish. I do
hope that Bill can re-do these graphs some time as it would enhance the
value of this work.
I am not at all sure that I can find the data anymore to redo the
graphs.
About all I could do is to use gimp to replace the axes labels and make
the 5 look a bit more like 5 rather than 6. The problem is at the small
scale of the superscripts, the little culicue up at the bottom of the 5
in the font used becomes a single pixel closing off the the loop, making
it look a lot like a 6. So I used gimp to open it up again, and also to
labels on the axes.
Thanks, Bill. Sounds like an update to "supermongo" is needed! Can it
label the axes? Not critical to regenerate the graphs, but perhaps if
you add a little to the text to clarify scales and axes it may help others.
Cheers,
David
--
Cheers,
David
Web: http://www.satsignal.eu
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