Hi, On Sat, 19 Jan 2008, Luis R. Rodriguez wrote: > On Jan 18, 2008 7:50 AM, Bruno Randolf <bruno@xxxxxxxxxxxxx> wrote: > > + * always extend the mac timestamp, since this information is > > + * also needed for proper IBSS merging. > > + * > > + * XXX: it might be too late to do it here, since rs_tstamp is > > + * 15bit only. that means TSF extension has to be done within > > + * 32.768usec = 32ms. it might be necessary to move this to the > > + * interrupt handler, like it is done in madwifi. > > + */ > > I'm trying to understand this a bit more and am confused. The TSF > timer is based on 1MHz clock so it has a resolution of 1 microsecond > (us). For 15 bits that would mean 32768 us so don't you mean it should > be done within 32.768 ms instead of usec (or us)? > Hi, it is a typo. You are correct. It should be done within 32.768 ms. On a high end laptop, it is almost guaranteed that the bottom half will process the packet within 32 ms. However, on an embedded box (low spec cpu) that has a temporarily high load, 32 ms is a short time, and the timestamp may have wrapped around. this is unfortunate. Derek. -- Derek Smithies Ph.D. IndraNet Technologies Ltd. Email: derek@xxxxxxxxxxxxxx ph +64 3 365 6485 Web: http://www.indranet-technologies.com/ - To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
