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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...
I hope everyone has had a good new year. I just wanted to let everyone know that I have partially resolved my large file copy issue by installing the recently released Vista SP1 RC Refresh . My file copy woes are not completely over, see picture...I only get about 28 MB/sec performance across the GB interface. If anyone has any ideas please let me know. I recently switched to Intel GB NICs in hope it was due to the on board broadcom cards, but it didn't make a difference. The next thing is to replace my linksys switch. One other thing, I needed to turn ECN Capability off.
It seems that my issue with poor network performance is back. I think it may have to do with the following hotfix that was installed last night... Let me see about re-installing the hotfix....
I have spent the better part of my free time struggling with Windows Vista and the ASUS P5B Deluxe motherboard which has two Marvell Yukon Gig-E network interfaces. I recently replaced an older machine with a new machine and was achieving only 5-10MB/sec transfer rates between the machine or ~<5-10Mb/second. So my performance benchmarks are not scientific at all, I was just using the Vista copy information and resource monitor to get a general idea of the relative performance. My new setup is two PCs with the exact same motherboard. Both machines have 4GB, 8GB RAM and Core 2 Duo E6600 and Q6600 respectively. Both machine are using two Seagate 320GB 7200RPM drives in a RAID 0. I also have the machines connected to a Linksys GIG-E switch... Local file copy between my RAID 0 drives is 76MB/sec (small files) to 320MB/sec (large files). So the network in all cases should be the bottleneck. I read a bunch of articles talking about setting some of the tcp parameters...