BINGO!  EasyTune was the culprit.  Thanks for the tip, Jim.  I had installed everything on the Gigabyte disc when I first installed, but I had uninstalled most of the crap (with Revo Uninstaller), but missed the EasyTune. 

Latency is now back averaging about 100 microsec's.

Thanks to all for suggestions and help.

Jack

jcschild


show the pick to my head tech since he happened to be in my office whist having this page up.....
quote "consistant spikes like that are 99% network"

Sometimes a TCP/IP reset using netsh can fix some of these gremlins.

It's simple enough to do as a first resort.

http://support.microsoft.com/kb/299357

Reboot after and check again.

edit:

Whoops too late, funny the rest of the posts weren't showing up when I posted this.

Anyhow glad it's sorted.  Gah, Easy Tune/AI suite type problems again...

mike_mccue

 
I wish there was some tool that we could use to identify what causes the interrupts... it's my impression that trial/error/observation is the only way to search out the troublemaker.

That's the trouble with DPCLat it's a nice hypnotic display but doesn't actually tell you anything.

The Resplendence Latency Monitor is a much better tool for finding out what is actually going on.

http://www.resplendence.com/latencymon

My older PC was working without any problems.  I decided to run the DPC Latency checker just to see, and it showed no problems.  I ran across the resplendence program and ran it , too just to see,  and it showed several "problems".   As it wasn't "broke", I didn't "fix it".

fireberd


My older PC was working without any problems.  I decided to run the DPC Latency checker just to see, and it showed no problems.  I ran across the resplendence program and ran it , too just to see,  and it showed several "problems".   As it wasn't "broke", I didn't "fix it".

Yes I'd only use LatencyMon if DPClat is showing up issues in the first place as a means of investigating further.

The common culprits are the PS2 port driver (use a USB mouse/keyboard where possible), USB stuff, networking elements if you have internet enabled and networking elements even if you don't have internet enabled.

No way round the networking stuff as Microsoft likes us all to be networked unfortunately but some of it can be minimized.