Re: pyramid display timer/highres issue

On 09.01.2014 12:52, J=F6rg Hohwieler wrote:
> It's a long time since I started this thread, but finally I found a
> solution.
>
> --- pylcd.c.orig        2013-11-19 13:02:20.733699143 +0100
> +++ pylcd.c     2013-11-19 13:02:28.629900897 +0100
> @@ -208,7 +208,7 @@ real_send_tele(PrivateData *p, char *buf
>      write(p->FD, buffer2, len);
>
>      /* Take a little nap. This works as a pacemaker */
> -    usleep(50);
> +    usleep(30000);
>
>      return 0;
>  }
>
>
> Before introduction of high resolution timers I think the timer
> granularity was not fine enough for usleep(50). So I guess usleep(50)
> took always much more time than intended.
>
> With introduction of highres timers the granularity became much finer,
> resulting in the intended sleep time of usleep(50).
>
> Running with usleep(50) the displays processor becomes overloaded as too
> much commands are coming in.
>
> Running the kernel now with highres=3Doff and usleep(30000) behaves the
> same as with highres=3Don.
>
> Btw, I've determined the value empirically but it seems to be fine.
>
> Please include my patch above.
>
> thank you.
>
>
> Best regards
> Joerg	=

>

Hi J=F6rg,

I will be happy to commit this. Before that I'd like to test with some
'non Linux' OS. Just for curiosity.

Regards,
Markus