New machines (more accurately new operating system installs) seem to come with all sorts of services enabled by default to do Important Things that someone thinks you must want to do. There are lots of things that cause spikes in the latency measurements.
I just bought a refurbished machine running XP, which had behavior similar to what you describe. I spent a few hours turning off irrelevant services, which got the DPC latency down to about 50us or so. You can turn off services one at a time and watch the graph to see which ones are causing the problems. Check out http://www.thesycon.de/deu/latency_check.shtml -- it has the software for download and instructions on how to turn things off that you don't need. 73, /Jack K3FIV Point Arena, CA On Sun, 2009-05-17 at 17:50 -0400, brahman...@aol.com wrote: > Hello All, > > Hope everyone had a good time at Dayton. I know you'all will be busy for a > few days, just hoping for a quick answer. I built a 2.8GHZ AMD Phenom II > 8.0MB cache Quad core/XP Home/4 GB 800 MHz RAM/NVidia 8500 video card > computer for the Flex 3000. I'm still trying to find a TI chip firewire card. > > None I could find in Houston. Tiger Direct has one I'm going to order. I have > a > VIA chipset 1394A card in it now. > > Anyhow, I'm still screwed. My older Vista quad core, with nothing running > and radio not hooked up, shows about 45us latency. The new machine has 875us > latency with peaks maxing out the graph every couple of seconds under the > same conditions. > > My question, is the Flex Radio fire wire driver DPC only checking the > firewire card? If so, a new firewire card might be the solution, or do I need > to > dig deeper? What other causes are there for high latency? > > 73, > Marty AB5GU _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/
