Performance problem using Intel X520-DA2

Marcin Markowski mmarkowski at
Mon Jan 23 21:23:42 UTC 2012

  Hi Jack,

Thank You for Your answer.

I forgot to mention that if the program will run for more than 30-40 
server loses connection to the internet. I'm not sure if problem isnt
with MSI-X, because NIC (82575EB - igb driver) used for the internet is 
using MSI-X. Disabling MSI-X for ixgbe or switching on old NIC
(82571EB - em driver) fixes issue (I'm unable to disable MSI-X on
igb because the watchdog resets the card if using only MSI).

Marcin Markowski

On 23.01.2012 21:25, Jack Vogel wrote:
> There may be some interrupt handling changes coming, but at least for
> the moment you need to increase the storm threshold, or set it to 0 
> to
> disable it.
> Jack
> On Mon, Jan 23, 2012 at 12:20 PM, Marcin Markowski  wrote:
>>  Hello,
>> We use FreeBSD as sniffer (libpcap programs) and we experience
>> performance problems when incoming traffic is greater than
>> 7.5Gbps/s.
>> If we check top we see that first irq from network card is using
>> 100% CPU. Ive tested this on FreeBSD 8.2-RELEASE and 9.0-RELEASE
>> (on 9.0 we can see also kernel thread named {ix0 que} using 100%
>> CPU),
>> and both systems behave the same. In logs we see also:
>> interrupt storm detected on "irq268:"; throttling interrupt source
>> Our server platform is Intel SR2600URBRP, 2x Xeon X5650, 6GB RAM
>> and
>> NIC Intel X520-DA2.
>> Im not sure if problem is with NIC or motherboard in SR2600URBRP,
>> because everything is fine when we use other server configuration:
>> Intel SR1630GP, 1x Xeon X3450, 8GB RAM, NIC X520-DA2
>> My /boot/loader.conf:
>> kern.ipc.nmbclusters=262144
>> hw.ixgbe.rxd=2048
>> hw.ixgbe.txd=2048
>> hw.ixgbe.num_queues=16
>> /etc/sysctl.conf
>> hw.intr_storm_threshold=10000
>> --
>> Marcin Markowski

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