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

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

Ian,
Not sure how familiar you are with tcpdump, but the "-w" option on tcpdump 
means that tcpdump will *not* display packets captured on stdout.  The output 
you posted indicates that tcpdump captured 53 packets - you need to use tcpdump 
to read back the captured data from the file, like so:

tcpdump -s 0 -r dom0_vif.pcap

Then you'll see all of the packets that were captured in that file.

-Nick

>>> On 2010/06/15 at 06:50, "Ian Tobin" <itobin@xxxxxxxxxxxxx> wrote: 
> 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
> 
> Thanks
> 
> Ian
> 
> 
> 
> -----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.
> 
> James
> 
>> -----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,
> its
>> that slow it took ages to download wireshark, i had to run the
> constant
>> 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
> 4
>> vCPUs assigned to my domU.
>> 
>> -Nick
>> 
>> 
>> 
>> 
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