Hyper-v and very slow network

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dear all,

i have big problem hyper-v server , network card. i've found lot of topic around question none of them helped me.

i have win 2008 r2 server hyper-v installed. have 3 nic , 1 reserved host management , others 2 reserved virtual machine .

all nic intel, 1 integrated on intel motherboard , others intel gigabit et dual port .

before installing role of hyper-v nic worked speed around 1gb (file transfer average 90 mb/sec, of course have gigabit lan) .

after hyper-v install, host system  is going slow , network file transfer using dedicated nic ten time slower (9-10mb /sec) . same problem vm off , if remove vm !

i tried of suggestion found in old post (disabling tcp checksum / offload ...) nothing happens.

what strange removing network card host operating system seems improve speed... but, of course, can't use  my lan :(

i need because every night must make full backup of virtual hard disk host backup server in lan.

my configuration:

- server win 2008 r2 sp1 hyper-v , no others role

- 2 virtual machine (one win 2008 r2 , 1 win 7 ultimate)

- nas linux (access via smb no problem)

- various windows 7 pro client

 

thanks in advance everybody,

luca m.

what network adapter using?  have got latest network drivers manufacturer?  possible try different network adapter?
cheers,
benjamin armstrong
============================
windows virtualization
senior lead program manager

posting provided no warranties, , confers no rights. assume risk use.


Windows Server  >  Hyper-V



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