For your information, with the latest developments related to VirtIO, I run
netperf a couple of times to see the exact standing of network
performance on the guests. The test was to run netperf -H "ip of LAN node", which tests TCP traffic for 10 seconds.
- x86 - x86: ~96 Mbps - reference between two different computers
- ARM Host - x86: ~80 Mbps
- ARM Guest - x86: ~ 2 Mbps - emulation
- ARM Guest - x86: ~74 Mbps - VirtIO
From these we conclude that:
- As expected x86 to x86 communication can reach the limit of the 100 Mbps LAN.
- The ARM board seems to not be capable of the LAN.
-
Network emulation in QEMU is more than just slow (expected).
Why is this expected? This performance drop is quite terrifying.
Alex
- VirtIO has a far greater performance gain than what was initially stated.
Notes:
- Running netperf from the x86 machine to guest/host, gave slightly higher numbers but resulted in around the same performance ratio.
- Similar results were obtained from an nfs and initrd (whole guest in RAM) guest boot method.
Regards.
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