Vista file copy performance finally solved!!!
Well it has been over a year since Vista has been released and I have been struggling with poor file copy performance between my Vista machines on a GB switch, since about December.
Poor Network Performance with Windows Vista (RTM)
Poor GB Network Performance on Vista back! =(
Poor Network Performance on Vista resolved?
I don't know how I missed the article about MMCSS (Multimedia Class Scheduler Service) but after reading into it, it seemed to fit my performance issue...my stability issues were due to old network drivers. If you have a Broadcom onboard nic, you should definitely upgrade the drivers.
Mark Russinovich uncovered that MMMCSS is hardcoded to throttle your network performance to 10,000 frames per second or about 15Mb/sec on standard ethernet with 1500 byte frames.
Here is the solution. I have disabled the MMCSS service, updated the registry to remove the Windows Audio dependency and network performance is back to where it should be! CPU utilization is a bit high, I will have to check to see if I disabled TCPChimney, RSS and TCPA (DMA)...Otherwise it looks good!
