Date: Mon, 23 Jun 2014 11:42:01 +0100 From: Karl Pielorz <kpielorz_lst@tdx.co.uk> To: freebsd-net@freebsd.org Subject: Weird Xen networking issue with PV interfaces passing traffic to other PV's... Message-ID: <7D8C9B50517ABCB6EB0984E0@Mail-PC.tdx.co.uk>
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Hi, I originally posted to freebsd-xen about this (and I've raised a PR) -pr188261 - <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=188261>; It's been suggested I should ask in FreeBSD-NET to see if someone can look at this, and suggest how to proceed... In a nutshell - the FreeBSD PV network code won't pass packets properly if you setup two VM's on the same XenServer trying to use one of the VM's as a 'router' (i.e. passing traffic). Swap it for linux - works. Disable PV - works - anyway, the details are in the PR. If anyone has a chance to look at that and suggest what I can do to try and debug this further? - I've done packet captures from the VM's (they show a lot of retransmits) - but I'm not sure how I can go any further in look at this - or what the problem is likely to be (it's been suggested it's checksum related - which '-txcsum' seems to address for clients, but not the router). If some kind soul can have a look at this - and suggest anything? Cheers, -Karl
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