> It _might_ not be the FireWire card. Recently I updated the driver > for the RealTek PCIe GBE Ethernet card. Everything worked fine, but I > saw the same spikes every 5 seconds, even without PowerSDR running. I
and > I experienced exactly this phenomenon after an upgrade of my system. >It turned out to be utilities from NVidia that came with my graphics card. Network and graphics cards are common causes of this problem. It is very unlikely that it's the firewire card. I remember (several years back) a *major* problem with a similar "pulsing" with extreme DPC latencies was caused by a driver for a network card which every few seconds spent several hundreds of milliseconds checking to see if the Ethernet cable speed had changed. The vendor was contacted and they fixed the driver. Turned out it was some developer's "big idea" that he should do this check. As soon as the problem was fixed... bingo, problem solved. Peter K1PGV -----Original Message----- From: Flexedge [mailto:[email protected]] On Behalf Of William H. Fite Sent: Friday, February 08, 2013 9:23 AM To: [email protected] Cc: [email protected] Subject: Re: [FlexEdge] Windows 7 DPC CPU usage spikes I experienced exactly this phenomenon after an upgrade of my system. It turned out to be utilities from NVidia that came with my graphics card. It was NOT the NVidia drivers (which have gotten a bum rap in some circles) but rather the variety of add-ons that manufacturers provide largely for marketing "value added" purposes. Since few, if any, of those are necessary, or even useful, I just shut them off and the DPC spikes vanished. Bill On Fri, Feb 8, 2013 at 8:10 AM, Alan <[email protected]> wrote: > It _might_ not be the FireWire card. Recently I updated the driver > for the RealTek PCIe GBE Ethernet card. Everything worked fine, but I > saw the same spikes every 5 seconds, even without PowerSDR running. I > rolled back the driver, and the problem went away. Neal recently > posted something about staying away from these drivers. > > 73s, > > Alan > WA4SCA > > > -----Original Message----- > From: Flexedge [mailto:[email protected]] On Behalf Of > Tim Ellison > Sent: Friday, February 08, 2013 5:25 AM > To: [email protected] > Subject: Re: [FlexEdge] Windows 7 DPC CPU usage spikes > > Sounds like it might the Firewire card itself, as it takes both > hardware and software to generate a DPC. > > It could also be your PCIe bus too. Make sure you have the latest > BIOS update for your machine along with the latest mobo chipset drivers too. > > -Tim > > On 2/7/2013 5:04 PM, Bill K7UOP wrote: > > I recently installed a FireWire card and PowerSDR v2.5.3 on a > > Windows > > 7 machine. The installation was painless and works fine. > > > > I noticed the CPU % on PowerSDR was periodically jumping from 25% to > > 70%. Further investigation showed that whenever I turn on the Flex > > 5000 hardware these periodic spikes start occurring (about every 5 > > sec or so). PowerSDR does not have to be running. Digging deeper, > > using Process Explorer, the spikes in CPU usage are caused by DPC's > > (Deferred Procedure Calls). Also saw a reference about being related > > to interrupts. There seems to be something happening with the > > FireWire card and the radio. > > > > The FireWire card is a Best Connectivity PCI-Express IEEE 1394b. It > > supports up to 800Mbps and is TI chip based (TI XIO2213). I tried > > all three drivers available on this machine, TI Compliant, Standard > > and the Legacy OHCI. All three work with the radio but all have the > > same spikes. > > > > A friend of mine does not see the problem with his Win 7 Flex > > installation. > > > > Everything works fine and I don't notice any performance degradation > > of any programs. But it's an anomally and I would like to see it fixed. > > > > Any ideas? > > > > 73, Bill - K7UOP > > _______________________________________________ > > Flexedge mailing list > > [email protected] > > http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz > > This is the FlexRadio Systems e-mail Reflector called FlexEdge. It > > is used for posting topics related to SDR software innovation and > > other technical SDR topics. > > > _______________________________________________ > Flexedge mailing list > [email protected] > http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz > This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is > used for posting topics related to SDR software innovation and other > technical SDR topics. > > > _______________________________________________ > Flexedge mailing list > [email protected] > http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz > This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is > used for posting topics related to SDR software innovation and other > technical SDR topics. > -- I can explain it for you, but I can't comprehend it for you. _______________________________________________ Flexedge mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software innovation and other technical SDR topics. _______________________________________________ Flexedge mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software innovation and other technical SDR topics.
