libvirt and kvm networking

Not sure where to post this....

I have a kvm 'guest' running on a Fedora 8 box. It has a web server
running on it. I am using livbirt ( I guess ) to setup the vnet0
network device. When I start the kvm 'guest' vnet1 is started.

Everything seems to work ( I can ping my kvm 'guest' and vica-versa )
but if I put the network under a small load using webbench ) the
network delays go through the roof.

If I run 30 seconds of webbench ( same page loaded over and over again )
I get:
Speed=414 pages/min, 108129 bytes/sec.
Speed=1118 pages/min, 291756 bytes/sec.
Speed=762 pages/min, 198755 bytes/sec.
Speed=552 pages/min, 143980 bytes/sec.
Speed=474 pages/min, 123779 bytes/sec.
Speed=426 pages/min, 111115 bytes/sec.
Speed=658 pages/min, 172051 bytes/sec.
Speed=304 pages/min, 79293 bytes/sec.
Speed=510 pages/min, 133400 bytes/sec.
Speed=874 pages/min, 227968 bytes/sec.

these numbers should be failly consistent given that they are run
during the same time period, one right after another and nothing else
is running during that 5 minute span.

pings show:

64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=95 ttl=64 time=1569 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=96 ttl=64 time=570 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=97 ttl=64 time=0.769 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=98 ttl=64 time=0.355 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=99 ttl=64 time=0.322 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=100 ttl=64 time=0.277 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=101 ttl=64 time=10128 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=102 ttl=64 time=9129 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=103 ttl=64 time=8129 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=104 ttl=64 time=7130 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=105 ttl=64 time=6130 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=106 ttl=64 time=5130 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=107 ttl=64 time=4131 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=108 ttl=64 time=3131 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=109 ttl=64 time=2131 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=110 ttl=64 time=1132 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=111 ttl=64 time=132 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=112 ttl=64 time=0.591 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=113 ttl=64 time=1.26 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=114 ttl=64 time=2571 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=115 ttl=64 time=1571 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=116 ttl=64 time=571 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=117 ttl=64 time=0.670 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=118 ttl=64 time=0.588 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=119 ttl=64 time=7123 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=120 ttl=64 time=6124 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=121 ttl=64 time=5125 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=122 ttl=64 time=4125 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=123 ttl=64 time=3125 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=124 ttl=64 time=2126 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=125 ttl=64 time=1126 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=126 ttl=64 time=126 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=127 ttl=64 time=0.699 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=128 ttl=64 time=0.264 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=129 ttl=64 time=0.192 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=130 ttl=64 time=0.854 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=131 ttl=64 time=0.671 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=132 ttl=64 time=0.380 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=133 ttl=64 time=0.187 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=134 ttl=64 time=0.220 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=135 ttl=64 time=1574 ms
64 bytes from kvmweb.private.net (192.168.100.23): icmp_seq=136 ttl=64 time=575 ms


.... I'm not loosing any packets... but the response time really, really
flucuates... 10 seconds -vs- 126ms.

Does anyonw know how to get this virtual network stuff more stable?

--
D.A.M. - Mothers Against Dyslexia

see http://www.jacksnodgrass.com for my contact info.

jack - Grapevine/Richardson
.

Relevant Pages

  • Re: networking w two win xp home w/ sp2
    ... guest cannot see host. ... >>i have gotten network to work. ... There are 1 servers in domain MSHOME on transport ...
    (microsoft.public.windowsxp.network_web)
  • Re: [patch 2/6] [Network namespace] Network device sharing by view
    ... every network problem was caused by the change in semantics ... available IPs ... ... the first assigned IP (to make guest local traffic ...
    (Linux-Kernel)
  • Re: problem with networking
    ... >normal network speed between the 2 computers. ... On any XP Pro computer, check to see if Simple File Sharing (Control Panel - ... On XP Home, and on XP Pro with Simple File Sharing enabled, make sure that the ... Guest account is enabled, on each computer. ...
    (microsoft.public.windowsxp.network_web)
  • RE: "Guest mode" in WiFi RADIUS?
    ... network (19 times out of 20 this will only be for access to the internet or ... their office VPNs) without compromising our network security. ... are using MAC filtering, WPA w/ TKIP-PSK, and no SSID broadcasts. ... a guest to connect to our wireless network with his laptop WITHOUT having to ...
    (microsoft.public.windows.server.active_directory)
  • Re: networking w two win xp home w/ sp2
    ... >>>netwrok setup host can see and get files from guest and use internet through ... guest cannot see host. ... >>>i have gotten network to work. ...
    (microsoft.public.windowsxp.network_web)