[Xen-API] XCP 1.5 BETA BUG: Slow performance with 10Gbit network cards

[Sébastien Riccio <sr@xxxxxxxxxxxxxxx>]

Hi,

I'm currently playing with XCP 1.5 beta on a Dell Blade infrastructure 
that is linked to redundent filers with 10gbits NICs.
The redundent 10gigs interfaces are not managed by xapi (i've told xapi 
to forget them) and are configured like on any normal linux box.
They are connected to the same 10gig switch where the filers are 
connected to.
Interfaces on the filers:
03:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM57711 
10-Gigabit PCIe
03:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM57711 
10-Gigabit PCIe
04:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM57711 
10-Gigabit PCIe
04:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM57711 
10-Gigabit PCIe
Interfaces on the blades:
05:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM57711 
10-Gigabit PCIe
05:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM57711 
10-Gigabit PCIe
The problem is that after some testing with iperf i get to this conclusion:

1) Between the filers the speed is 9.9Gbit/s.
2) Between xcp 1.5 and both filer i get around 3Gbit/s which is quite poor
2) Between an xcp 1.1 and both filer i get around 3Gbit/s which is quite 
poor (so that's not a new 1.5 bug)
3) Between an xcp 1.5 and another xcp (1.1) i get too around 3Gbit/s.

Do you have any ideas what could be the problem ? knowing that between 
the filers the speed is good and it's passing through the same switch.
Is there a DDK VM available for XCP 1.5 beta? I would like to try to 
build the latest Broadcom drivers for these nics (bnx2x) for the kernel 
used on xcp 1.5...
In the meantime I will try to install a debian on another blade to check 
if the speed are correct with the filers.
Thanks,
Sébastien


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