WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

[Xen-users] Network latencies are a multiple of four

To: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-users] Network latencies are a multiple of four
From: Jan Marquardt <jm@xxxxxxxxxxx>
Date: Wed, 07 May 2008 16:56:12 +0200
Delivery-date: Wed, 07 May 2008 07:56:45 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Thunderbird 1.5.0.14ubu (X11/20080306)
Hallo list,

I just have noticed that the latency of ping as well as traceroute are always, nearly multiples of four. e. g. a ping to ripe.net looks like this:

PING ripe.net (193.0.19.25) 56(84) bytes of data.
64 bytes from aquila.ripe.net (193.0.19.25): icmp_seq=1 ttl=55 time=20.0 ms
64 bytes from aquila.ripe.net (193.0.19.25): icmp_seq=2 ttl=55 time=16.0 ms
64 bytes from aquila.ripe.net (193.0.19.25): icmp_seq=3 ttl=55 time=16.0 ms
64 bytes from aquila.ripe.net (193.0.19.25): icmp_seq=4 ttl=55 time=16.0 ms
64 bytes from aquila.ripe.net (193.0.19.25): icmp_seq=5 ttl=55 time=20.0 ms
64 bytes from aquila.ripe.net (193.0.19.25): icmp_seq=6 ttl=55 time=20.0 ms
64 bytes from aquila.ripe.net (193.0.19.25): icmp_seq=7 ttl=55 time=32.0 ms
64 bytes from aquila.ripe.net (193.0.19.25): icmp_seq=8 ttl=55 time=16.0 ms
64 bytes from aquila.ripe.net (193.0.19.25): icmp_seq=9 ttl=55 time=28.0 ms
64 bytes from aquila.ripe.net (193.0.19.25): icmp_seq=10 ttl=55 time=28.0 ms

It looks the same in domU and dom0. My system has the following key data: Ubuntu 7.10, 64 Bit, kernel was shipped with distribution (2.6.22-14-xen).

Did anyone experience the same problem or can give me a hint to find the reason for this.

Thanks for your help in advance.

Regards,

Jan Marquardt

--
Artfiles New Media GmbH | Spaldingstr. 160 b | 20097 Hamburg
Tel: 040 - 32 02 72 90 | Fax: 040 - 32 02 72 95
E-Mail: support@xxxxxxxxxxx | Web: http://www.artfiles.de
Geschäftsführer Carsten Bals | Handelsregister Hamburg - HRB 81478

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users

<Prev in Thread] Current Thread [Next in Thread>