Is Hyper-V Virtual Switch limited by the slowest NIC on the host system?

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for last 2 weeks have been playing hyper-v server 2012 r2. system based on celeron 847, wasn't expecting stellar performance.

the mainboard has 1 integrated realtek 1gb nic.

i installed windows 7 guest , created external virtual switch, connected onboard nic , allowed host share connection.

this lead bad user experience when connecting guest system via remote desktop (freezes every few seconds). searched solution , found lot of recommendations add dedicated nic guests.

the thing hands on on sunday apple 100mbit usb ethenet adapter use on macbook air. installed drivers on host , freezes inside guest system went away.

because didn't want transfer files between guests , host via external 100mbit connection, added second switch, set internal. configured both host , guest static ips on internal switch sure route ip packets take.

i mapped share on host network drive on guest (using ip address, not host name) , transferred large files between host , guest , noticed transfer 10mbyte/s.

on hunch, installed real 1gb nic today , removed usb adapter. reconfigured external switch use new nic , did more tests. transfer rates went 50mbyte/s! same rate when transferring files external machine host, guess limit of cpu can handle, fine me.

is internal speed of virtual switches limited slowest nic connected virtual switch? or missing something? i'm pretty sure ip packets aren't going through external switch / adapter, because can pull network cable , transfer isn't interrupted. besides, using resource monitor on guest can see virtual nic connected internal switch registering relevant traffic.

if has insight this, please share. might me troubleshoot seemingly similar problem have @ work on 2008 r2 server, our sysadmin hasn't been able figure out.

thanks

tomkraut

in end, virtual switch limited smallest pipe.

this said, virtual switch presents vms being 10gb link.  support vm vm traffic @ 10gb.

if attached 1gb physical nic.  vm other thing on lan limited 1gb (there no way upscale - networking physics).

in case physical nic benefitting additional offloading technologies (there various) that present in nic card, not present in usb dongle.

brian ehlert
http://itproctology.blogspot.com
learn. apply. repeat.
disclaimer: attempting change of own free will.



Windows Server  >  Hyper-V



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