Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

This is very strange: it seems whenever I have the Virtual PC Console running (I don't even need to have a Virtual Machine running), my gigabit network connection gets throttled to from ~500Mbps down to ~100Mbps.

Here's a iperf log, where I opened and then closed the Virtual PC Console:

[ ID] Interval       Transfer     Bandwidth
[108]  0.0- 1.0 sec  52.2 MBytes   438 Mbits/sec
[108]  1.0- 2.0 sec  53.7 MBytes   450 Mbits/sec
[108]  2.0- 3.0 sec  53.1 MBytes   445 Mbits/sec
[108]  3.0- 4.0 sec  53.8 MBytes   451 Mbits/sec
[108]  4.0- 5.0 sec  53.5 MBytes   449 Mbits/sec
[108]  5.0- 6.0 sec  51.6 MBytes   433 Mbits/sec
[108]  6.0- 7.0 sec  20.5 MBytes   172 Mbits/sec
[108]  7.0- 8.0 sec  15.6 MBytes   131 Mbits/sec
[108]  8.0- 9.0 sec  15.6 MBytes   131 Mbits/sec
[108]  9.0-10.0 sec  15.6 MBytes   131 Mbits/sec
[108] 10.0-11.0 sec  14.4 MBytes   121 Mbits/sec
[108] 11.0-12.0 sec  39.8 MBytes   334 Mbits/sec
[108] 12.0-13.0 sec  53.3 MBytes   447 Mbits/sec
[108] 13.0-14.0 sec  54.3 MBytes   456 Mbits/sec
[108] 14.0-15.0 sec  53.6 MBytes   450 Mbits/sec
[108] 15.0-16.0 sec  53.7 MBytes   450 Mbits/sec
[108] 16.0-17.0 sec  53.4 MBytes   448 Mbits/sec
[108] 17.0-18.0 sec  53.2 MBytes   446 Mbits/sec
[108] 18.0-19.0 sec  53.8 MBytes   452 Mbits/sec
[108] 19.0-20.0 sec  53.5 MBytes   448 Mbits/sec

I'm running Windows Vista Home Premium SP2 and Virtual PC 6.0.156.0.

Does anyone have any idea what's going on, and how I can fix it?

share|improve this question
add comment

1 Answer

It might be Virtual PC's bridged network driver.

(screenshot: Local Area Connection properties)

It should be inactive when no VMs are running, but try disabling it anyway and check if it helps.

share|improve this answer
    
I just tried it, but it didn't seem to help. –  Kaypro II Jan 23 '10 at 1:06
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.