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
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