[hpsdr] Recent PowerSDR versions and DPCs - curiouser and curiouser!!

[Phil Harman]

Hi Pete,

You may want to try this DPC monitor software:

http://www.resplendence.com/latencymon


Ken, N9VV, kindly brought this to my attention and I've been using the
free version for a few days now. It appears to indicate which driver is
actually causing the problem.

73 Phil...VK6APH



> ***** High Performance Software Defined Radio Discussion List *****
>
> Hello All,
> I have been wondering for some time if anyone else who uses PowerSDR
> regularly has the following issues. My setup is Mercury, Pennylane, Metis,
> Alex, Pennywhistle and Excaliber with current firmware and PowerSDR dated
> 10/16/12. Computers are an older dual-core E6750 2.6MHz, and a dual-core
> mini-itx also 2.6MHz. Both have 4MB RAM and run XP. I have run dpclat
> while operating with either computer, and both systems show the same weird
> behaviour. With the display set as panafall, at irregular time intervals
> sometimes up to several hours, the panascope display freezes and
> receive/transmit audio drops out. As far as I can recall, this issue did
> not arise with versions of PowerSDR in use over a year or so ago.
> As expected, dpclat revealed a huge (off scale) dpc peak when this freeze
> occurred. Sequentially killing unused drivers had no effect, but if
> PowerSDR was not running, these huge peaks never occurred. With PowerSDR
> running normally, the typical dpc was about 50microsec, rising sometimes
> to about 1000microsec for short periods after band change and/or mode
> change. Even so such changes did not give rise to significant clicks and
> bangs in the Rx audio or display jitters. However, sometimes when PowerSDR
> was started, or after a band change, especially in USB/LSB mode, dpcs
> would rise to some15000microsec and stay there. Normal operation could
> continue in this state, but I suspect that any additional polling while in
> this state could trigger the freeze-up. Band and mode changes when in this
> state were usually accompanied by audio clicks and bangs, and were much
> slower than normal.
> Unfortunately these problems are not 100% replicable, but are annoying
> none the less. Is it possible there is an odd bug lurking either in the
> driver, or in the bandswitch/mode switch parts of the PowerSDR code? - or
> do I simply need to upgrade my computer?
> I have also noted the recent change in behaviour of the bandswitches when
> saving last used frequency which was raised recently.
> Pete, G3LWT
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