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Thanks for the clarifying this. Would there be an other and better way to deal reduce the 10ms minimum delay? I'm afraid that doing what I did could have a significant impact on performance. The BogoMIPS didn't bother. I just saw this as a sign that what I did was not entirely correct and could have other adverse effect. --- In "Kris" <> wrote: > > These are all artifacts from changing your kernel tick rate. The booting delay seen by SD card is because you are causing context switching to happen more often (every 1ms as opposed to 10ms) and since sdctl and nbd are userspace applications they can get switched out more if the dynamic scheduler of the kernel feels they are getting too much CPU time. > > The BoGoMIPS is calibrated based on the kernel tick I believe. They are a horribly measure of CPU speed anyway, and messing with the tick times 10 threw off the calculation times 10. > > -Kris Bahnsen > Technologic Systems > > > --- In JF Morneau jf@ wrote: > > > > With the default kernel, I can't get delays of less than 10ms. I > > increased the CONFIG_HZ from 100 to 1000 and I now can get sub 10ms delays. > > > > Timing in our program seems to work. I could verify from an external > > time source that a 2 ms delay is really 2 ms. However, our custom setup > > was booting in around 13 sec from sd. It now boots in 30 sec. I also > > noticed this change from dmesg: > > > > [ 0.020000] Calibrating delay loop (skipped)... 1916.92 BogoMIPS preset > > > > Before, it was: > > > > [ 0.010000] Calibrating delay loop (skipped)... 191.69 BogoMIPS preset > > > > It seems that there is more to it than just changing the CONFIG_HZ > > kernel config. > > > __._,_.___
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