[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Checksumming problem in pv_ops dom0 kernel / netback
On Thu, Apr 15, 2010 at 09:20:39AM +0100, Ian Campbell wrote: > On Tue, 2010-03-30 at 23:58 +0100, Scott Garron wrote: > > S.H. Verbrugge wrote: > > > Ever since we switched to a pv_ops dom0 kernel (we were using 2.6.26 > > > xenkernel from Debian repo before, with Xen 3.2), we started to have > > > some problems when attempting to route packets on a domU. > > > > I'm having the same problem. All TCP packets that are forwarded > > through a domU are somehow getting a static checksum (0x9e85) just as > > they're being put out on the wire. ICMP is dropped by the dom0, as you > > describe, with the "Attempting to checksum a non UDP/TCP packet" message > > in dmesg. More detail about my situation is in my post to xen-users, here: > > > > http://lists.xensource.com/archives/html/xen-users/2010-03/msg00846.html > > > > It doesn't include a solution, though. > > > > > This is a tg3 interface > > > > I'm also running the tg3 ethernet driver, which may be of > > significance. > > According to the driver source some tg3 chipsets are known to have > broken checksumming hardware, in particular 5700 B0 silicon. The > workaround seems to have been present in the driver forever though so > that may be a red-herring. > Recently there was a fix for a bug in netback.. so you might want to update to latest pvops dom0 kernel from xen/stable-2.6.32.x branch and see if that fixes the problem. -- Pasi _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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