Date: Tue, 11 Feb 2014 18:20:42 +0100 From: =?UTF-8?B?Um9nZXIgUGF1IE1vbm7DqQ==?= <roger.pau@citrix.com> To: Karl Pielorz <kpielorz_lst@tdx.co.uk>, <freebsd-xen@freebsd.org> Subject: Re: Xen PV Networking issue - disable PV NIC in XENHVM FreeBSD? Message-ID: <52FA5BEA.6030307@citrix.com> In-Reply-To: <72C34BC121BD5A0FBDAEFA37@Mail-PC.tdx.co.uk> References: <D280F84BE886E8D6110B93D0@study64.tdx.co.uk> <52F8FE87.1010705@citrix.com> <72C34BC121BD5A0FBDAEFA37@Mail-PC.tdx.co.uk>
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On 11/02/14 17:33, Karl Pielorz wrote: > > > --On 10 February 2014 17:29 +0100 Roger Pau Monné <roger.pau@citrix.com> > wrote: > >> That's quite weird... Do you see any messages in the Xen console (xl >> dmesg)? Can you boot with a hypervisor compiled with debug=y and see if >> there are any strange messages on the Xen console? > > Ok, no messages logged anywhere when this goes on - I'm running > XenServer 6.2 installed from the distribution ISO (w/SP1 applied) - I > don't know/think that's compiled with 'debug=y'? dmesg output for > XenServer coming up is 'unremarkable' as far as I can see, and nothing > is logged with 'xl dmesg' > >> Also, does replacing the FreeBSD gateway VM with a Linux PV VM solve the >> issue? (ie. just to check if Linux also shows this behaviour) > > Ok, that I could do - and just did. I used CentOS 6 - which booted in > 'Xen' aware mode (with Xen Virtual ethernet driver) - annoyingly that > works *fine* (i.e. no issues). > > So, > > Windows 7 PV <-> FreeBSD 9.x / 10.x PV = Fail (if on same XenServer host) > Windows 7 HVM <-> FreeBSD PV = Works > Windows 7 PV <-> Linux (CentOS 6) PV = Works Just to clarify, are you unable to reach a FreeBSD PV DomU from a Windows PV DomU on the same host, or are you unable to route traffic trough a FreeBSD PV DomU (on the same host)? (ie. can you ssh from the Windows PV DomU into the FreeBSD PV DomU?) > > So it looks like it might actually be a FreeBSD/Xen issue? Yes, it looks that way (dunno if netback might also be involved in this) > I just tried booting FreeBSD 10 without the Xen options in the kernel, > and it won't boot (it panics). > > Is there any way of booting 10.x in HVM mode (i.e. with no Xen PV > support) - or at least switching 'xn' for 're' as far as nic's go? I have to look into this, FreeBSD should not panic when trying to boot without XENHVM on a DomU. AFAIK there's no way to selectively enable/disable the usage of certain PV interfaces, but I certainly don't recommend switching to an emulated nic to do the routing. > Are there any 'offload' type features that can be disabled for 'xn' nics > in FreeBSD? You could try to disable the following: ifconfig xnX -rxcsum -txcsum -tso4 -lro Or a mix of those, I'm afraid I'm not that familiar with netfront/netback to provide any more hints. In the past there have been reports of TSO breaking on Xen PV interfaces, but AFAIK this should be fixed already. Roger.home | help
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