Hi Al I think you may be making a judgment based on a correlation which is that if it runs well on XP but not on Win7 it must be that Flex driver has a problem with Win7. What I think you are seeing, however, is the effect of Win 7 on a system that ran well under XP!
On my computers I see a 3x to 4x increase in DPCs running Win7 versus XP Pro on the exact hardware. The issue is that Win7 is a much larger operating system than XP and therefore takes up much more resources (and hence is less "real-time" than XP is. You can try to tune Win7 to get it out of the way as much as possible but its just that Win7 is probably twice (if not more) as large as XP! You can tell this by the DPC latency program. PowerSDR doesn't have any major effect on DPCs other than expecting they are very low. That is a factor of the operating system, the drivers of the hardware and the motherboard. On my systems, the DPC ratings are the same pretty much whether I run PowerSDR or not (it certainly doesn't substantially increase them). I would look at what IRQ assignments are under the Win7 machine and see what is sharing irqs especially with the firewire device. When you see the DPCLat program go yellow or red, I think you usually have two high-bandwidth devices fighting for the same interrupts. It could be on your machine there is a Flex driver issue with the hardware under Win7 but I can attest 7171 runs fine under Win7 (I just expect my systems to have DPCs in the 20s instead of the 80-120s)! 73 Neal Campbell Abroham Neal Software www.abrohamnealsoftware.com (540) 645 5394 NEW PHONE NUMBER Amateur Radio: K3NC Blog: http://www.abrohamnealsoftware.com/blog/ DXBase bug reports: email to ca...@dxbase.fogbugz.com Abroham Neal forums: http:/www.abrohamnealsoftware.com/community/ On Sun, Feb 7, 2010 at 9:31 AM, Al Konschak <w...@konschak.org> wrote: > I received my Flex 3000 last May and been running it on Win XP and Vista 32 > on a laptop with no issues at all. > > A few weeks ago I decided to upgrade the shack computer to Win 7 with a > clean install and new hard drive. > > The computer is a Dell 420 with a Quad core Q9400 running 4 gigs of ram. > Surely enough horse power to run PSDR. > > > > I did the upgrade and downloaded the latest drivers and Power SDR from the > Flex site. Everything worked right from the beginning, until I ran another > program with streaming media content, whether it be audio or video > concurrently with the flex. > > > > The audio on the 3K would start to garble. If I restarted Power SDR, it > would clear for a few seconds then start to garble again. Everything would > run fine as long as I didn't multitask two streaming programs. > > > > I did a little research and found out about DPC latency checker. Every > time > I ran it with multiple streams, it ran off the chart in the red. > > > > I made sure all my drivers were up to date from the dell site and also > played around with various buffering in the flex with no success. > > > > Since I never had this problem with XP, I thought I'd roll back the Flex > driver to an earlier version. That didn't work at all with Win 7. Looks > like > you must have the latest driver for 7. > > > > Since I kept my XP hard drive intact, I decided to put it back in the > machine. > > I updated the Flex drivers on the XP drive to the latest (It was 2 versions > back). > > > > Everything is now working fine with XP and I can stream other programs > along > with the flex with very little latency. > > > > It seems the latest Flex driver may have a problem with Win 7 on my > machine. > I wonder if others are seeing the same? > > > > Al Konschak > > WI3Z > > > > _______________________________________________ > 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/ > _______________________________________________ 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/
