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. _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
