Dear WireShark Team, I have a very interesting behavior on some VM's installed with plain Windows 2012 R2 Server using PVSCSI and VMXNET3 drivers on vSphere 6.
Using a database client application it takes a x amount of time to load the data from the db to the VM. For troubleshooting reasons I installed WireShark as the loading performance was not sufficient.
Now the cool thing is that starting WireShark and closing it again and then using the database client application suddenly everything is very fast! This performance improvement stays there until the VM is restarted. Opening and closing WireShark again is then bringing the VM network speed back to it's high performance.
It seems that during the start of WireShark something is changed/reinitialized on the Windows networking parameters. Since I'm not very fund of reading source code I was wondering if any of you guys can tell me what is done on the Windows network side while starting WireShark or if you might have any hints regarding this.
asked 12 Feb '16, 02:13
Good news, we found a solution that worked for us:
try this: disable LRO aka RSC on your VM:
answered 13 Feb '16, 12:21