[ kvm-Bugs-1884444 ] Virtual network (set up via TCP socket) dog slow, but vde ok

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Bugs item #1884444, was opened at 2008-02-01 15:30
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Category: qemu
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Alain Knaff (alain_knaff)
Assigned to: Nobody/Anonymous (nobody)
Summary: Virtual network (set up via TCP socket) dog slow, but vde ok

Initial Comment:
I've got two kvm virtual machines that I connect to gether via a virtual network:

1. A samba server (Kubuntu 7.10), whose network I set up with -net nic,vlan=1,macaddr=00:1B:FC:1C:00:01 -net socket,vlan=1,listen=127.0.0.1:1234

2. A Windows XP client, whose network I set up with -net nic,vlan=1,macaddr=00:1B:FC:1C:01:11 -net socket,vlan=1,connect=127.0.0.1:1234

The Windows XP VM has joined the Samba VM's domain.
When a domain user logs in, it takes litterally _minutes_ until its profile data is copied to the client, and same thing to copy it back to the server on logout.

Setting up both with VDE, it's *much* quicker (only a couple of seconds, rather than minutes for login/logout).

I also tried udp mcast networking, but couldn't get both VMs to communicate with each other. A tcpdump on the host shows traffic on port 1234. However, a tcpdump on the Kubuntu guest shows no traffic (not even arp) when I try to ping it from the windows VM


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