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.
