Re: [Bugme-new] [Bug 12327] New: Intermittent TCP issues with => 2.6.27

["Ilpo Järvinen" <ilpo.jarvinen@helsinki.fi>]

On Thu, 8 Jan 2009, Stephen Hemminger wrote:

> On Fri, 09 Jan 2009 00:04:42 +0900
> Speedster <speedster@haveacry.com> wrote:
> 
> > Herbert Xu wrote:
> > > 
> > > Can you please take a look at /proc/net/snmp on the host and the
> > > guest to see if IP InDiscards is non-zero?
> > 
> > Both are 0
> > 
> > > Also now that we know the problem is definitely in the host/guest
> > > please take another set of dumps on the interfaces leading to and
> > > within the guest to see exactly which path of the system is dropping
> > > the reply.
> > 
> > Attached (all are the exact same attempted connection), and reveal some 
> > interesting information.
> > 
> > The path the inbound traffic should take is
> > 1. vlan50 (host)
> > 2. tap interface vnet3 (host) / eth0 (guest)
> > 3. ppp0 (guest)
> > 
> > It looks as though when it is sent out the tap interface the payload 
> > length is incorrect in the PPPoE section of the frame. When it arrives 
> > via vlan50 it appears fine. Or at least that's what wireshark highlights 
> > for me :)
> 
> Maybe there is an issue that GRO receive isn't handling padding
> properly?

Hmm, is gro supposed to have something to do with 2.6.27??? Or are you 
talking something else than Herbert's recent GRO stuff?


-- 
 i.