Re: [Xen-devel] PCI passthrough issue

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2011-02-01 at 22:04 +0000, Jean Baptiste Favre wrote:
> Le 01/02/2011 17:23, Ian Campbell a Ãcrit :

> > I assume you are not seeing "rx mapping error" in your domU dmesg? Did
> > you post a full guest console log at some point? Comparing the logs for
> > the 256MB, 398MB and 512MB guest RAM case might be useful.
> No sure I've ever posted that logs. But I can redo my tests :)

yes, please do that.

Please can you also collect and post the information from ifconfig and
ethtool -S which I asked for earlier.

Can you confirm that on the domU tcpdump shows no incoming frames at
all, including no corrupted or strange frames. It has been suggested
that the frames could be being received ok but contain garbage (e.g. due
to swiotlb not syncing the memory properly) and hence are not ICMP
Responses but appear as some random frame type.

Please can you use "tcpdump -w" on both the gateway/peer side and the
affected domU to capture a short session while the failing ping is
running and post (or link to if large) the resulting pcap files. On the
peer side you can use "ether host <domU-MAC>" (plus optionally "or ether
broadcast") on the tcpdump command line to limit the capture to just the
one peer and reduce the size of the capture.

Ian.


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