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RE: [Xen-users] Problems with GPLPV network latency

To: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>, "Nick Couchman" <Nick.Couchman@xxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] Problems with GPLPV network latency
From: "Ian Tobin" <itobin@xxxxxxxxxxxxx>
Date: Tue, 15 Jun 2010 13:50:48 +0100
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Thread-topic: [Xen-users] Problems with GPLPV network latency
Ive run the capture however on Dom0 nothing seems to be logged, 

tcpdump -s0 -w dom0_vif.pcap arp
tcpdump: WARNING: peth0: no IPv4 address assigned
tcpdump: listening on peth0, link-type EN10MB (Ethernet), capture size
65535 bytes
^C53 packets captured
54 packets received by filter
0 packets dropped by kernel

I will email the DomU capture straight to you



-----Original Message-----
From: James Harper [mailto:james.harper@xxxxxxxxxxxxxxxx] 
Sent: 15 June 2010 00:13
To: Ian Tobin; Nick Couchman; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] Problems with GPLPV network latency

In dom0:
tcpdump -s0 -w dom0_vif.pcap arp or icmp

Same filter in domU, whether you use tcpdump or wireshark

Then do a few pings etc.


> -----Original Message-----
> From: Ian Tobin [mailto:itobin@xxxxxxxxxxxxx]
> Sent: Tuesday, 15 June 2010 06:38
> To: Nick Couchman; James Harper; xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-users] Problems with GPLPV network latency
> Hi James,
> Can you tell me what info you need from the capture?  i.e. any special
> command line options etc.
> FYI i have a windows 2003 DomU which is also seeing the same issue,
> that slow it took ages to download wireshark, i had to run the
> ping so that it had connectivity, very odd.
> Im running with a Single cpu on the DomU.
> Thanks
> Ian
> -----Original Message-----
> From: Nick Couchman [mailto:Nick.Couchman@xxxxxxxxx]
> Sent: 08 June 2010 16:22
> To: James Harper; xen-users@xxxxxxxxxxxxxxxxxxx; Ian Tobin
> Subject: RE: [Xen-users] Problems with GPLPV network latency
> >
> > Are you really seeing high latency or just reported high latency? Eg
> > when it says 1200ms, does it really take an extra second?
> I'm seeing the high latency numbers reported in Windows, but not the
> actual latency.  Must be the multi-CPU issue you mentioned, as I have
> vCPUs assigned to my domU.
> -Nick
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