[time-nuts] DPC Latency
lists at lazygranch.com
Sun Jun 19 21:42:36 UTC 2011
This was a good excuse to fix some driver issues. My mobo had an issue
with USB3. I also switched from IDE to ACHI on the Sata. [There is a
registry trick to do this. You can't just change the bios. At least for
After all the tweaks, I think the D525 is always going to have 2ms
jumps. It is not a fast processor. I tried disabling drivers and it made
Incidentally if you really want to get the latest drivers, you need to
run some hardware probing program to see what chips are on your mobo,
the get the driver from the chip manufacturer. The motherboard
manufacturer isn't always up to date.
I flashed the bios, but using PNP OS still gives better results.
On 6/18/2011 2:25 PM, Bob Camp wrote:
> Like any basic tool it's just a start. Simply knowing that the system has this or that latency compared to another system is a useful piece of data. Anything under 100 us isn't going to be easy to find. Stuff that's into the many ms range probably should be tracked down.
> On Jun 18, 2011, at 3:35 PM, gary wrote:
>> Doing a bit of bios hacking, DPC shows better results with Plug and Play enabled. It is my understanding that it is better to let the bios handle plug and play rather than the OS, but the results are better with Plug and Play handled by win7.
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