On 12/22/2017 03:46 AM, Jarle Thorsen wrote:
In Qubes 3.2 I have a Windows 7 HVM (with windows tools installed) connected to
a NetVM with a 10Gbe network card.
The Windows VM has plenty of memory and cpu-cores allocated. I use iperf to
test the bandwith to an external server using similar iperf settings in both
VM's. (Trying different -w and -P settings)
In the netvm I get around 9Gbits/sec as expected, but in the Windows VM it
maxes out at about 2Gbit/sec?
Is this a known limit in a Windows HVM?
Single file network transfers aren't multi-threaded and you have the
overhead from emulated VM>VM networking.
Try assigning an SR-IOV VF to that VM if you want better speed (SR-IOV
VF is more secure than simply assigning the whole card)
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