On Sunday, January 5, 2014 7:13:06 PM UTC-5, Roman Mamedov wrote: > > On Sun, 5 Jan 2014 16:01:20 -0800 (PST) > Patrick Wood <patric...@gmail.com <javascript:>> wrote: > > > Also, my experience with performance on the A10 devices over the last > two > > years has shown me that ondemand is a really terrible governor, as it > > doesn't boost the CPU frequency unless utilization has been high over an > > extended period > > This is easily tunable via knobs mentioned at > http://linux-sunxi.org/Cpufreq > > Specifically you want to reduce the up_threshold, in the example on that > page > the frequency will be boosted as soon as the CPU utilization even touches > 25%. > Not "high over extended period", is it? And then if an issue arises that > it > drops back too quickly, that can be tuned by changing > sampling_down_factor. >
Yes, but most people don't bother to read that. In fact, most people don't know about the cpu governors; they just complain about performance. The default settings for ondemand are obviously poor for non-battery use. Also, none of these knobs helps boot times. > > > so even programs that are CPU bound don't cause it to > > switch if they spend just a little time reading or writing data. > > Set io_is_busy to 1, and even time spent reading or writing data (in > iowait) > will count as "CPU load" for the purposes of frequency switching. > See comment above. > > > interactive is much better at increasing the CPU clock even on > relatively > > small changes in demand. > > My guess is that people tend to invent crazy new obscure governors mostly > because they didn't spend any time reading documentation for the existing > ones > (and how to properly configure them for the usage scenario at hand). > See comment above. The current default governor (ondemand) and/or its default settings need to be changed. Pat > > -- > With respect, > Roman > -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
