Hi, There is no any delay in original code, if GPS chip can't provide data so fast, it will output useless filler, read process filter out filler and continue read again until enough data received, that is bad. So better performance I mean here is don't waste CPU time to do useless works.
Thanks Allen -----Original Message----- From: Arjan van de Ven [mailto:[email protected]] Sent: Sunday, July 24, 2011 6:50 PM To: Kao, Allen Cc: [email protected] Subject: Re: [Meego-kernel] [PATCH ] Atheros ar1520 GPS: add pause between each read On 7/24/2011 6:48 PM, Arjan van de Ven wrote: > On 7/22/2011 5:09 PM, Kao, Allen wrote: >> >> From: Allen Kao <[email protected]> >> >> Date: Sat Jul 23 01:23:15 CST 2011 >> >> Subject: Atheros ar1520 GPS: add pause between each read >> >> Add 5ms-15ms pause between each read process to make performance >> better >> >> This driver work on Acer M&M tablet for MeeGo, which is available on >> I2C-0 port. >> > > how does busy waiting for 5 - 15 msec help performance? > It's busy waiting.. costing tons of power! eh wait usleep not udelay... so it's not busy waiting.. but how does sleeping for this period help performance? _______________________________________________ MeeGo-kernel mailing list [email protected] http://lists.meego.com/listinfo/meego-kernel
