IOMeter On Storage Dirvers resulting in Negetive numbers.

hi all,
I have written a Storage Driver and when i run My IO meter on a
machine with more than 2 Ghz processor speed i see that IO meter returns -ve
numbers. I Hook up analyzer and saw that the Data transfer is perfect on the
bus and no reset bus were happening. This behaviour is not seen on
machines less than 2 ghz processor speeds. I doubt that It’s the IO Meter
who is causing this problem. The same problem is seen with Winbench.

Anyone is aware of this issue?? If it is a IO meter problem then how can i
get a workaround for this.

Any help is highly appriciated.

thanks
ajitabh