Re: [Xen-users] Slow networking problem in dom0

[Emil Christopher Melar <typeof@xxxxxxxxx>]

On Sat, May 14, 2011 at 6:14 PM, Erwan RENIER <erwan.renier@xxxxxxxxxxx> wrote:
> Did you try tcpdump  allready to examine it with wireshark, to see i there
> are problems with the flows ( like retransmitted paquets ) , i had this
> problem on virtualbox that maid the network very slow.

My bridge setup is pretty standard. Speed is OK right after boot. But
over time (hours) it drops to 500-600 k/sec. My setup is stated in the
first post.
tcpdump didn't work:

> Another option is to not bridge but route the network, at least to see if it
> works.
> Also did you check your stats on the interfaces and on the bridge for errors
> ?

tcpdump doesn't say anything unusual when it comes to ICMP at least.
Any suggestions to what to test on?
I did  sudo tcpdump -nnvvi xen-pub  icmp[0] = 8 or icmp[0] = 30.
I am clueless on what to test :-)

I can't change the network configuration as I am only on remote right
now. I just want to know if there's anything inherently wrong with my
kernel and / or bridge configuration.

> can you post the result of : ifconfig -a on the host.
> Is there any relevant logs ( dmesg ).
> Thanks.

eth0      Link encap:Ethernet  HWaddr 00:1b:21:8d:b1:27
          inet6 addr: fe80::21b:21ff:fe8d:b127/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:69748631 errors:0 dropped:22 overruns:0 frame:0
          TX packets:20460331 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:87875949926 (87.8 GB)  TX bytes:21764017480 (21.7 GB)

eth1      Link encap:Ethernet  HWaddr bc:ae:c5:de:97:0d
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:18

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:9862 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9862 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:705262 (705.2 KB)  TX bytes:705262 (705.2 KB)

sit0      Link encap:IPv6-in-IPv4
          NOARP  MTU:1480  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

vif4.0    Link encap:Ethernet  HWaddr fe:ff:ff:ff:ff:ff
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:59827 errors:0 dropped:0 overruns:0 frame:0
          TX packets:700342 errors:0 dropped:6 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:11462334 (11.4 MB)  TX bytes:618194259 (618.1 MB)

virbr0    Link encap:Ethernet  HWaddr aa:5e:2e:b3:28:32
          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
          inet6 addr: fe80::a85e:2eff:feb3:2832/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:26 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:1628 (1.6 KB)

xen-dmz   Link encap:Ethernet  HWaddr 5a:d4:56:b2:a8:17
          inet6 addr: fe80::58d4:56ff:feb2:a817/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:468 (468.0 B)

xen-intern Link encap:Ethernet  HWaddr 02:99:ff:50:7b:22
          inet6 addr: fe80::99:ffff:fe50:7b22/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:468 (468.0 B)

xen-pub   Link encap:Ethernet  HWaddr 00:1b:21:8d:b1:27
          inet addr:192.168.0.3  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::21b:21ff:fe8d:b127/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:68302724 errors:0 dropped:0 overruns:0 frame:0
          TX packets:18407729 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:86617595475 (86.6 GB)  TX bytes:22462523015 (22.4 GB)


Thanks!
-- 
Emil Christopher Solli Melar

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