I have asked this same question several different times in different
ways and have not got a definitive answer yet. I believe there are some
here who would have you believe that if you do not run WIN XP and have
20us DPC or less, PSDR is not going to run properly. My own one month
experience with Flex 5000a shows this NOT to be true, Before I tweaked
my computer I did not have DPC's under 400-500us and occasional blips at
1000us. The DPC checker in the Flex driver said I could run in normal
mode. I instead ran in Safe mode 1 per the Flex manual. I had NO lockups
and NO problems with audio RX or TX, made at least 50-60 QSOes cw and
SSB and RTTY.
Then I got to tweaking the computer. I run (HORRORS) Vista - I can run
WIN XP but much prefer WIN Vista for many reasons. It is superior to Win
XP in many areas. I refuse to give up the many improved features of
Vista just to run a radio.
I went to Black Viper and Tweak Hound websites. Tweaked my services as
much as possible. Then I got the sysinternals program and eliminated
Many programs I no longer even had from autorunning.. The end result
after all this is my DPC's are now under 20 us. YES, I am running Vista
with a 4 year old HP A1450n AMD 4200 dual core computer and get DPC's of
25 us or less........ Note my HP has an ASUS motherboard and I use the
internal motherboard (Agere) Firewire port.... Low DPC's are very
possible with an off the shelf computer that does not run Win XP.. You
will have to work at it.. BUT - - - - - - - - - - -
I notice NO difference in the operation of PSDR. It runs the same as it
did before I did all the tweaking.
My Present Take on all this: Tweaking is fine, it will not hurt. DPC
differences between under 20us and a few hundred us will not show up in
the operation of PSDR..
Stan K9IUQ
Ross Stenberg wrote:
Neil, thank you for sharing your knowledge with us. I see that your
goal is avg 20us DPCs. What is your take on performance hits due to
higher DPCs? I believe the Flex position is that performance should be
acceptable if DPCs are no more that 1000us as shown on the their
driver DPC latency checker. Does it really make a difference if ones
DPC is 138us or 543us?
73 Ross K9COX
_______________________________________________
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/
