dpc latency consistently high

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vargis

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Apr 27, 2010
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I bought a new pc 2 months ago. The specs are in my profile info, but I'll copy them here too:

Intel S1156 Core i7 860 2.8GHz Quad Core CPU
Gigabyte S1156 GA-H57M-USB3 Mobo
DDR3 4GB G.Skill 1600MHz PC12800 Trident RAM
Internal All-in-1 Mem Card Reader
1TB Seagate 7200rpm 32M Serial ATA HDD
Asus GTS250 1GB PCIe Video Card
Antec 200 Case
CoolerMaster Extreme Power 650W Power Supply
Logitech S520 Cordless Kbd & Mouse
LG 22x DVD Burner SATA OEM
Integrated Sound Card
TP-Link WN821N Wireless-N USB Adapter
FDD/Card Reader Mount 3.5inch To 5.25inch
MS Win 7 Pro 64bit OEM
MS Win xp home 32 bit

I got windows 7 64bit pro oem with the machine, then I added windows xp home retail version for dual booting. The reason I added xp was because I use a digidesign mbox sound interface for audio production. This interface is not supported on windows 7 (won't install).

I set up the dual booting, installed my mbox on xp, and found that I was getting occasional drop outs with static. So, I downloaded dpc latency checker and found that the latency consistently sits just below the 2000 microsecond mark, with the occasional peak above it (screenshot attached). However, when I boot windows 7, the latency is consistently much lower.

I have tried disabling and re-enabling devices in device manager. I tried all the devices that didn't look system-critical. No change. After trying them one at a time, I also tried some combinations. This also produced no change.

I was not familiar with dpc latency before this issue. The articles that I have recently read suggest that most problems produce a graph on dpc latency checker that shows most of the latency levels low, but then occasional spikes that are much greater. The second image on http://www.thesycon.de/deu/latency_check.shtml shows such an image. Does the comparative consistency of my output suggest that my problem is caused by something more pervasive than a single device?
 

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