OpenVZ Forum


Home » General » Support » Network speed dropped 50% (Network speed dropped 50% after OS update of host system)
Network speed dropped 50% [message #51460] Sun, 15 June 2014 14:19 Go to next message
Gerard64 is currently offline  Gerard64
Messages: 6
Registered: August 2011
Location: Eijsden / The Netherlands
Junior Member
From: *cm-5-3a.dynamic.ziggo.nl
I updated the host OS of my OpenVZ server from Debian Squeeze to Debian Wheezy 7.5 with kernel 2.6.32-openvz-amd64.

Before the update network speeds were around 480mbps also internally from vps to vps and from/to the host system.

Now if I download from my ftp vps speed is around 15MB/s (120mbps) before it was > 40MB's and from my samba vps with veth interface speed dropped from 60MB's to 35MB's.

I tested with a 100mb file with sftp from the host to on of the vps systems only 10MB's internal speed.

Nothing else changed but this OS update.

I have read countless forums posts about possible solutions like ethtool and tc settings i all tested no change sadly.

What could i have overlooked or could be the problem?
Re: Network speed dropped 50% [message #51481 is a reply to message #51460] Tue, 24 June 2014 19:26 Go to previous messageGo to next message
devonblzx is currently offline  devonblzx
Messages: 127
Registered: December 2006
Senior Member
From: *dhcp.bycy.mi.charter.com
From the recent update there is a message about conntrack being disabled on the host node to fix venet performance issues. Maybe this is related.

http://static.openvz.org/userbars/openvz-user-2.png
ByteOnSite President
Re: Network speed dropped 50% [message #51484 is a reply to message #51460] Tue, 24 June 2014 20:39 Go to previous messageGo to next message
Gerard64 is currently offline  Gerard64
Messages: 6
Registered: August 2011
Location: Eijsden / The Netherlands
Junior Member
From: *cm-5-3a.dynamic.ziggo.nl
Hello Devonblzx,

Your probably talking about "Bug 2755 - nf_conntrack required for OpenVZ". I set this on my HN, rebooted and tested. Unfortunately no difference in network speed.

This bug is about Venet performance. Besides venet for most of my containers I use a veth interface in one of my containers and there speed dropped also with 50% after the update of my debian squeeze 32bit to debian wheezy 64bit.

Thank you for your help and tip about this conntrack "bug" I wasn't aware of.

[Updated on: Tue, 24 June 2014 20:43]

Report message to a moderator

Re: Network speed dropped 50% [message #51486 is a reply to message #51484] Wed, 25 June 2014 05:44 Go to previous message
devonblzx is currently offline  devonblzx
Messages: 127
Registered: December 2006
Senior Member
From: *dhcp.bycy.mi.charter.com
CentOS user and I don't do many transfers between containers on the same host node. Are you sure it stays within the host node the entire time? Tracerouting doesn't leave the node?

If it stays on the node the whole time, you'd probably have better luck using the OpenVZ bugzilla to file a report.


http://static.openvz.org/userbars/openvz-user-2.png
ByteOnSite President

[Updated on: Wed, 25 June 2014 05:45]

Report message to a moderator

Previous Topic: How to escape the no_loop_device flaw ?
Next Topic: OpenVZ old Centos templates
Goto Forum:
  


Current Time: Wed Nov 22 12:53:11 GMT 2017