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Re: [Xen-users] Windows 2008 - slow upload

-------- Original Message  --------
Subject: Re: [Xen-users] Windows 2008 - slow upload
From: James Harper <james.harper@xxxxxxxxxxxxxxxx>
To: Tomek <timor@xxxxx>
Date: 04.08.2009 15:25

So you aren't using Jumbo frames though? (I've never tested with Jumbo

No, I don't use jambo frames.

But Large Send was enabled in the DomU which was affecting
DomU->external traffic, but not DomU->DomX traffic right?

Exactly. But I don't test DomU->Dom0 or Dom0->DomU. Dom0 is in different network on different interface:
- eth0 - Dom0 management, etc.,
- eth1 - DomU's interface with VLAN's.
I used this HOWTO for VLAN's configuration: http://renial.net/weblog/2007/02/27/xen-vlan/

I'd still like to find what the root cause is (netback bug? GPLPV bug?
Physical Ethernet device driver bug?) but I'm glad it's working for you

Tell me what you need and I will give it to you. You had time for me so I'm obliged to find some for you.

Just to get this info in one spot (sorry if I'm asking you to repeat
yourselves), please tell me the versions of:

gplpv_fre_wlh_x86_0.10.0.69, gplpv_fre_wlh_x86_0.10.0.83 and gplpv_fre_wlh_x86_0.10.0.86 (I've tested on these three).

Xen (hypervisor)

# xm info
host                   : xxx
release                : 2.6.26-2-xen-amd64
version                : #1 SMP Sun Jul 26 22:39:03 UTC 2009
machine                : x86_64
nr_cpus                : 4
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 2833
hw_caps : bfebfbff:20100800:00000000:00000140:040ce3bd:00000000:00000001
total_memory           : 10237
free_memory            : 252
node_to_cpu            : node0:0-3
xen_major              : 3
xen_minor              : 2
xen_extra              : -1
xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : unavailable
cc_compiler            : gcc version 4.3.1 (Debian 4.3.1-2)
cc_compile_by          : waldi
cc_compile_domain      : debian.org
cc_compile_date        : Sat Jun 28 09:32:18 UTC 2008
xend_config_format     : 4

Dom0 Kernel
Dom0 kernel patch source if you aren't running the standard 2.6.18
kernel that ships with Xen, eg a distro kernel perhaps?

# uname -a
Linux xxx 2.6.26-2-xen-amd64 #1 SMP Sun Jul 26 22:39:03 UTC 2009 x86_64 GNU/Linux

Dom0 network module (eg e1000e)


Dom0 network card (just the make and chipset should be fine)

Ethernet controller: Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet (rev 12)

TX speed from DomU to Dom0 as measured with 'iperf -w1m' (approx will be
It could be quite hard in my current configuration.

TX speed from DomU to a physical machine on the other side of a 1GBit
interface from Dom0
With large data offload enabled/disabled or both?


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