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Re: [Xen-users] Network performance with HVM DomU

Since I've been dealing with netfront issues recently also (not on Linux or Windows), I would recommend that you take a capture of the packets seen in
the bridge using tcpdump and analize it with Wireshark or something
similar. FWIW, I use the following rune in order to make tcpdump generate a
file that I can open with Wireshark (this is all on Dom0):

# brctl show
(then you will have to identify a vif that belongs to one of the DomUs
involved in the transaction, they have the format vif<domid>.<order>).
# tcpdump -n -i <if> -s0 -w <output>.pcap

Then you can open the resulting <output>.pcap and check for retransmissions,
or anything strange.


I have seen on the dom0 host there are 2 net ifaces for the hvm windows domU (marax):

40: vif10.0-emu: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master xenbr5 state UNKNOWN qlen 500
    link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fcff:ffff:feff:ffff/64 scope link
       valid_lft forever preferred_lft forever
41: vif10.0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master xenbr5 state UP qlen 32
    link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff

xl network-list marax
Idx BE Mac Addr.         handle state evt-ch   tx-/rx-ring-ref BE-path
0 0 00:16:3e:05:01:10 0 4 16 16269/16268 /local/domain/0/backend/vif/10/0

it is normal? all my other domU's are linux domU's (pv) they have each only 1 net iface on dom0...



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