Re: [Xen-users] Slow Network Performance on GPLPV 9.12-pre13

[Mark Pace <pace@xxxxxxxxxxxxxxxxxxx>]

> How are you testing performance? And are you measuring from DomU->Dom0
> or DomU->external host?
>
>   
Copying to and from a SMB share, I've tried the following at this point:

DomU->DomU on same host, speed is good both copying to and from the share.
DomU->External Hosts, copying from the share to the DomU is good,
copying to the share is really slow.

So I tried FTP and SCP instead of SMB traffic:

DomU->DomU on same host, speed is good both directions
DomU->External Host, speed is good both directions

Something strange is afoot...

> If the latter, then your network adapter may not support TCP task
> offload (checksum / large send), although if that was the case I would
> expect that your performance would be kbits not mbits...
>
>   
Definitely have TCP offload on these machines.  Built in Intel Gigabit
connectors on Supermicro motherboard.

The condition is the same across the three different 2003 DomUs I have
on this host.  I do have another host around that I can move one of
these DomUs onto to see what happens there.


pace

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