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Network slowness [message #14563] Mon, 02 July 2007 14:13 Go to previous message
Kai Hendry is currently offline  Kai Hendry
Messages: 4
Registered: July 2007
Junior Member
Hi, I am using a kernel from deb http://download.openvz.org/debian etch main

Linux argo 2.6.18-028stab033.1-ovz-smp #1 SMP Thu May 31 04:17:27 CEST
2007 i686 GNU/Linux

argo$ sudo vzctl --version
vzctl version 3.0.11


I've setup an openvz VE (running Debian Unstable) like so:
http://faq.dabase.com/faqw.py?req=show&file=faq01.152.ht p

And I am quite happy with it. Except I have experiencing some odd
slow network behaviour, which I am having trouble debugging.

I first noticed it when my apt-get upgrades hung (timed out).

Now I've been noticing for an application in the VE to connect to a
remote mysql DB.

monty is my laptop in the UK
simon is the VE
argo is the host

http://pastebin.com/940574

You can see that simon seems to take consistently almost 30 secs to
get a couple of records from the DB. Any ideas why?

I have tried stopping and starting simon. I suspected DNS troubles at
first, though simon to be able to look up stuff as fast as argo.

Kind regards,

simon:~% sudo /sbin/ifconfig
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: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)

venet0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:127.0.0.1 P-t-P:127.0.0.1 Bcast:0.0.0.0 Mask:255.255.255.255
UP BROADCAST POINTOPOINT RUNNING NOARP MTU:1500 Metric:1
RX packets:1858952 errors:0 dropped:0 overruns:0 frame:0
TX packets:1771614 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:851745664 (812.2 MiB) TX bytes:258658607 (246.6 MiB)

venet0:0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:192.168.2.66 P-t-P:192.168.2.66 Bcast:0.0.0.0 Mask:255.255.255.255
UP BROADCAST POINTOPOINT RUNNING NOARP MTU:1500 Metric:1

simon:~% sudo route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
191.255.255.1 * 255.255.255.255 UH 0 0 0 venet0
default 191.255.255.1 0.0.0.0 UG 0 0 0 venet0
simon:~% sudo cat /etc/resolv.conf
search nipl.net
nameserver 72.29.96.250
 
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