Virtual Switch Weird Performance

hi hoping can point me in right direction here.  have underperforming external vswitch.

i testing using lantest (client server) using memory test throughput storage taken out of equation.  setup hyper v 2012 r2 cluster (2 node) patched.  have removed antivirus , firewall disabled.  have been through turn off vmq turn of offload etc on past few days, , nothing makes difference.  here figures odd , not par should happening.  nic's intel i350-t4 using latest intel driver, vmq disabled other offload enabled. integration services date. have tried using latest drivers, 2nd latest , ms one.

test physical server (not hv host) to nic on hyper v server (assigned external vswitch) - 800mbps read 800mbps write

test physical server virtual guest (2008 r2) 120mbps read 750mbps write (odd write different here) guest receiving traffic seems sluggish.

test physical server both nodes external vswitch nic (after enabling allow management share) 800mbps both ways

test vm vm on same host on private network 125mbps both ways. 

test vm vm each on separate host using external vswitch around 125mbps both ways.

vm performance great within rdp session, low cpu low diskq etc.  networking latency good, throughput terrible,

there no bandwidth management set within guest settings, there no qos policies set.  if throttle guests using bandwidth management can see working.  if remove figures above. 

seeing can great performance using nic have assigned (its team, tested single , teamed) factor sits in middle vswitch.  considering poor performance private switch should absolutely fly, there horribly wrong, or have overlooked. 

thanks reading, can point me in right direction.

update, removing vm hv , recreating same vhdx file, problem went away, confusing me why happened in first place on 2 vm's created week apart. have created 4 more since test , no issue. 1 thing ms support did best practice on first boot first restart, , update integration services. believe updated them on first login.

i cannot confirm issue, every machine since (and hosts have not been updated) works perfectly.  getting expected speeds v2p , v2v.

regards

andrew

Windows Server  >  Hyper-V