[ovirt-users] [OT] how to analyze/avoid dropped rx packets

[Edward Haas]

Hello Gianluca,

Not sure if I can help with this one, but could you just clarify from where
these DHCPv6 packets arrive?
You mentioned IPv6 is disabled on the VM, therefore I assume these are
ingress packets, right?
If this is the case, then perhaps the stack just drops the ingress packets
(as it has no handler for them).

Thanks,
Edy.


On Fri, Nov 10, 2017 at 11:33 AM, Gianluca Cecchi <gianluca.cecchi at gmail.com
> wrote:

> Hello,
> on some Oracle Linux 7 VMs I see that dropped RX packets continue to
> increase.
> The eth0 interface is virtio for all of them.
> When running tcpdump on eth0 the counter stop increasing and so it means
> tcpdump does capture them
>
> I found some references about these kind of rx dropped frames with CentOS
> 7 too and other distros with new kernels.
>
> eg:
> https://www.netiq.com/support/kb/doc.php?id=7007165
> and
> *https://serverfault.com/questions/528290/ifconfig-eth0-rx-dropped-packets
> <https://serverfault.com/questions/528290/ifconfig-eth0-rx-dropped-packets>*
>
> In my case it doesn't seem that the nature of the dropped packages is STP,
> but IP6
>
> On my VMs I have disabled ipv6
>
> I see that in about 100 seconds I have 180 dropped frames occured, and
> when running tcpdump for the same amount of time I have in it about 180
> DHCPv6 packets, so I presume it is it the responsible
> Any way to avoid this, at VM or hypervisor level?
>
> Thanks in advance,
> Gianluca
>
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