Re: [Xen-devel] Strange error in domU after dom0 update

[Andreas Florath <xen@xxxxxxxxxxxx>]

Hello!

The yesterdays patch fixed the tcp performance problem.

Run some tests:

Setup:

- 1- dom0 kernel 2.6.26 hardware A
- 2- dom0 kernel 2.6.26 hardware B
- 3- domU kernel 2.6.26 running on -1-
- 4- domU kernel 2.6.26 running on -2-

- 5- dom0 kernel 2.6.31.4 current pv_ops hardware C
- 6- dom0 kernel 2.6.31.4 current pv_ops hardware D
- 7- domU kernel 2.6.26 running on -5-
- 8- domU kernel 2.6.26 running on -6-

All hardware boxes are exactly the same hardware:
P4 2,8GHz with 1G RAM and Gigabit Ethernet

nuttcp

Results (average of three independent tests without
any other load):

                 ->     /    <-

- 1- <-> - 2- :  255 Mbps /  219 Mbps
- 1- <-> - 3- :   52 Mbps /   75 Mbps
- 1- <-> - 4- :  183 Mbps /  146 Mbps
- 3- <-> - 4- :  289 Mbps /  271 Mbps

- 5- <-> - 6- :  693 Mbps /  675 Mbps
- 5- <-> - 7- : 1045 Mbps / 1227 Mbps
- 5- <-> - 8- :  397 Mbps /  668 Mbps
- 7- <-> - 8- :  385 Mbps /  365 Mbps

So the speed increased.

> Yes, that's the netchannel2 merge.  Do you have it enabled in your
> config?  If it is not enabled then it definitely shouldn't have any
> effect on your system.  If it is enabled then it could be buggy because
> it is very new code.
netlink2 seams enabled (is set in the kernel config). Looks that this
is done by default.

The only remaining issue are now the millions of log messages:
netfront: rx->offset: 0, size: 4294967295
which occur only on the 2.6.31.4 pv_ops systems - and, what
I think at the moment, only for iSCSI traffic.

Kind regards - Andreas


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