Saul wrote: > > > > I thought SMI was supposed to increase latencies, but I only see > > > > latencies < 60us at any load, unless I start video capture. Does > > > > the latency test absolutely rule out SMI as the cause? > > > > > > Not really, e.g. if the video capture device is USB-attached, then > > > SMI could possibly remain in the picture. > > > > I have used the bttv driver with xawtv or mythtv and nvidia > > proprietary drivers on a dual pIII machine running latency and the > > maximum latency was far less than 100 us. What produces large spots, > > however, is switching virtual terminals or changing resolution. > > Doesn't xawtv change resolution for full screen mode ? Did not you use > > the 768x576 modeline hack ? > > > The video capture is not USB, it's a PCI card. Since I don't see poor > latencies I'm guessing my problem is *not* SMI related.
The latencies above 100us that you observe when starting video capture are abnormal. I was suggesting that these latencies are not due to video capture but to the fact that xawtv change resolution. Big latencies when switching virtual terminal are a well-known issue, not related to SMI. So my question was: is xawtv configured on your machine to change resolution when starting capture ? -- Gilles Chanteperdrix. _______________________________________________ Xenomai-help mailing list Xenomai-help@gna.org https://mail.gna.org/listinfo/xenomai-help