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Re: [Xen-users] Ping RTT is rounded on domu

from [Fajar A. Nugraha]

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To:	Ian Baber <ian@xxxxxxxxxxx>
Subject:	Re: [Xen-users] Ping RTT is rounded on domu
From:	"Fajar A. Nugraha" <fajar@xxxxxxxxx>
Date:	Fri, 5 Feb 2010 11:36:47 +0700
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On Fri, Feb 5, 2010 at 4:22 AM, Ian Baber <ian@xxxxxxxxxxx> wrote:
> I'm setting up a network monitoring program on a domu.  domu and dom0 are
> running the debian 2.6.26-2-xen-686 kernel.  All ping round trip times are
> an even integer number of milliseconds.  I've seen other posts on the list
> about strange RTT times, but they seem to deal with large changes caused by
> domu/dom0 clock synchronization.  I am already using the
> extra="clocksource=jiffies" option as described on the debian wiki
> (http://wiki.debian.org/Xen).


If it's clock issue you might want to try this:
http://wiki.xensource.com/xenwiki/xenpm#head-253cbbe6cf12fa31e10022610cd7090aa980921f

FYI RHEL5 system works fine WRT this issue.
# ping -n x.x.x.x
PING x.x.x.x (x.x.x.x) 56(84) bytes of data.
64 bytes from x.x.x.x: icmp_seq=1 ttl=255 time=0.433 ms
64 bytes from x.x.x.x: icmp_seq=2 ttl=255 time=0.520 ms
64 bytes from x.x.x.x: icmp_seq=3 ttl=255 time=0.842 ms
64 bytes from x.x.x.x: icmp_seq=4 ttl=255 time=4.37 ms

-- 
Fajar

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