Re: [Xen-users] slow network with gplpv drivers in vlan setup

[Matthieu Patou <mat+Informatique.xen@xxxxxxxxx>]

Hello Pasi, James

> > > How identical is identical? Are you able to determine the exact chipset
> > > and firmware version of the network adapters? Even if you bought the two
> > > servers from the same supplier at exactly the same time, there is still
> > > a chance that there is some hardware difference, most likely firmware.
> > >
> > >        
> > ethtool -i<interface>  in dom0 might show the firmware version.
> >
> > like this:
> >
> > # ethtool -i eth0
> > driver: e1000e
> > version: 1.0.2-k2
> > firmware-version: 5.11-8
> > bus-info: 0000:04:00.0
> >
> >      
So on the Dell Workstation with a broadcom card where I witnessed 
yesterday the problem I have:
ethtool -i eth1
driver: tg3
version: 3.92.1
firmware-version:
bus-info: 0000:02:00.0

ethtool -k eth1
Offload parameters for eth1:
Cannot get device flags: Operation not supported
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: on
udp fragmentation offload: off
generic segmentation offload: on
large receive offload: off


eth1 is the physical interface supporting the vlan99 device which is in 
the bridge for the windows servers.
On the other side on the 2 servers where I witnessed before the problem 
with the same image (I copied the image on the second server to be sure 
when I discovered a difference of behavior between the two servers) I 
have this:
"Good" server
ethtool -i eth1
driver: e1000e
version: 0.3.3.3-k2
firmware-version: 2.1-12
bus-info: 0000:04:00.1

ethtool -k eth1
Offload parameters for eth1:
Cannot get device flags: Operation not supported
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: on
udp fragmentation offload: off
generic segmentation offload: on
large receive offload: off


"Bad server"
ethtool -i eth1
driver: e1000e
version: 0.3.3.3-k2
firmware-version: 2.1-12
bus-info: 0000:04:00.1

ethtool -k eth1
Offload parameters for eth1:
Cannot get device flags: Operation not supported
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: on
udp fragmentation offload: off
generic segmentation offload: on
large receive offload: off



> Oh, and also "ethtool -k ethX" to get the dom0 offloading settings.
>    
Matthieu.

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