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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Feb 09, 2010 at 06:11:57PM +0300, Matthieu Patou wrote:
>
> 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
>

Hmm.. so the driver version is the same, firmware is the same, 
offloading settings are the same.

Is the bridge/vlan/bond configuration exactly the same between 
good and bad servers?

-- Pasi


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