[Xen-users] Poor performance on bandwidth, Xen 4.0.1 kernel pvop

Hello list,

I have two differents installation Xen Hypervisor on two identical physical server, on the same switch :
The problem is on my new server (Xen 4.0.1 with pvops kernel 2.6.32.24), I have bad performance on bandwidth
I have test with a files copy and "iperf".
Result iperf average:
Transfert Bandwidth
XEN-A -> Windows Physical: 1005 MBytes 843 Mbits/sec
XEN-B -> Windows Physical: 522 MBytes 438 Mbits/sec
Windows Physical -> XEN-A: 477 MBytes 399 Mbits/sec
Windows Physical -> XEN-B: 175 MBytes 146 Mbits/sec

It's the same network card but on the new installation, the module bnx2 have a new version...
Maybe i haven't activate or forget something...
If you have an idea, I listen you !! Thanks in advance !
This is the details of two installations:

XEN-A:
- XEN 3.2.1 kernel 2.6.26-2-xen-amd64
#xm info
release : 2.6.26-2-xen-amd64
version : #1 SMP Sun Jun 21 08:09:04 UTC 2009
machine : x86_64
nr_cpus : 4
nr_nodes : 1
cores_per_socket : 2
threads_per_core : 1
cpu_mhz : 1995
hw_caps : bfebfbff:20100800:00000000:00000140:0004e33d:00000000:00000001
total_memory : 24570
free_memory : 918
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

#lspci -v
09:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet (rev 12)
Subsystem: Dell Device 01b2
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 16
Memory at f4000000 (64-bit, non-prefetchable) [size=32M]
Capabilities: [40] PCI-X non-bridge device
Capabilities: [48] Power Management version 2
Capabilities: [50] Vital Product Data <?>
Capabilities: [58] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
Kernel driver in use: bnx2
Kernel modules: bnx2

#ethtool -i peth0
driver: bnx2
version: 1.7.5
firmware-version: 2.9.1
bus-info: 0000:05:00.0

XEN-B:
- XEN 4.0.1 kernel pvops 2.6.32.24
#xm info
release : 2.6.32.24
version : #1 SMP Thu Oct 14 10:56:13 CEST 2010
machine : x86_64
nr_cpus : 4
nr_nodes : 1
cores_per_socket : 2
threads_per_core : 1
cpu_mhz : 1995
hw_caps : bfebfbff:20100800:00000000:00000940:0004e33d:00000000:00000001:00000000
virt_caps : hvm
total_memory : 24570
free_memory : 10
node_to_cpu : node0:0-3
node_to_memory : node0:10
node_to_dma32_mem : node0:9
max_node_id : 0
xen_major : 4
xen_minor : 0
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
xen_commandline : loglvl=all guest_loglvl=all sync_console console_to_ring com1=19200,8n1 console=com1
cc_compiler : gcc version 4.3.2 (Debian 4.3.2-1.1)
cc_compile_by : root
cc_compile_domain : test.com
cc_compile_date : Thu Oct 14 03:37:34 EDT 2010
xend_config_format : 4

#ethtool -i peth0
driver: bnx2
version: 2.0.2
firmware-version: 2.9.1
bus-info: 0000:05:00.0

#lspci -v
09:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet (rev 12)
Subsystem: Dell Device 01b2
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 1245
Memory at f4000000 (64-bit, non-prefetchable) [size=32M]
Capabilities: [40] PCI-X non-bridge device
Capabilities: [48] Power Management version 2
Capabilities: [50] Vital Product Data <?>
Capabilities: [58] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable+
Kernel driver in use: bnx2
Kernel modules: bnx2

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[Xen-users] Poor performance on bandwidth, Xen 4.0.1 kernel pvops 2.6.32