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Date:      Wed, 4 May 2016 09:49:36 +0200
From:      Roger Pau =?iso-8859-1?Q?Monn=E9?= <roger.pau@citrix.com>
To:        "K. Macy" <kmacy@freebsd.org>
Cc:        Miguel C <miguelmclara@gmail.com>, "freebsd-xen@freebsd.org" <freebsd-xen@freebsd.org>, Stephen Jones <StephenJo@livingcomputermuseum.org>, <wei.liu2@citrix.com>
Subject:   Re: xn ethernet issues as DOMU under NetBSD DOM0
Message-ID:  <20160504074936.a5u7pnpzltlyjwaa@mac>
In-Reply-To: <CAHM0Q_MO_pFSnLYtmikxL1qWOETO4avd0%2BaOEn%2B7=nZTT3_tuw@mail.gmail.com>
References:  <C4D720DD281F6740AC917B82741E9AD2AB27BC39@505MBX1.corp.vnw.com> <20160503072441.qgqgaw52sijybg4a@mac> <C4D720DD281F6740AC917B82741E9AD2AB27C045@505MBX1.corp.vnw.com> <20160503093211.hkmbbqr6t2fbxqqa@mac> <C4D720DD281F6740AC917B82741E9AD2AB27C2AA@505MBX1.corp.vnw.com> <CAHM0Q_NefH4zbtRY8MB5_90r=FCZAmki=riogNbktxyzSzLXFw@mail.gmail.com> <C4D720DD281F6740AC917B82741E9AD2AB27C323@505MBX1.corp.vnw.com> <CADGo8CXsWJ%2B9AroeOXvruWLiuLiAUd%2BPu687Vp=g789EJtDFPw@mail.gmail.com> <CAHM0Q_MO_pFSnLYtmikxL1qWOETO4avd0%2BaOEn%2B7=nZTT3_tuw@mail.gmail.com>

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Hello,

I'm adding Wei Liu who did the rework of the netfront driver and added 
multiqueue to it.

On Tue, May 03, 2016 at 03:23:50PM -0700, K. Macy wrote:
> On Tue, May 3, 2016 at 3:11 PM, Miguel C <miguelmclara@gmail.com> wrote:
> > This was reported by me and others a few times its was actually fixed in
> > some 10.0 (current build at the time) but we could never track it, however
> > it always seemed related to tso, netbsd backhend (as I was told back then)
> > doesn't support at least tso, and In fact I had the same issue with Windwos
> > Guests but the PV drivers dev fixed it (and it was indeed related to this)
> 
> That would explain it. If the Linux backend supports TSO, then
> netfront will of course advertise TSO. And presumably there's no way
> to query the netback, since Xen is linux-centric. Assuming you haven't
> already I would disable TSO.

I'm worried it might have something to do with the "feature-sg" node that's 
exported on the backend path. It seems like FreeBSD correctly acknowledges 
it, but there might be some bugs there.

Stephen, can you paste the output of running `xenstore-ls -fp` on the Dom0 
when the FreeBSD DomU has booted? Could you also paste the kernel dmesg of 
the FreeBSD guest?

What seems even more strange is the fact that it works during installs but 
not after, the kernel is exactly the same for installers, so I'm puzzled.

Roger.



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