Performance problem using Intel X520-DA2

[Marcin Markowski]

On 24.01.2012 09:18, Nikolay Denev wrote:
> On Jan 23, 2012, at 11:39 PM, Marcin Markowski wrote:
>
>> Hello,
>>
>> This message has been sent to freebsd-performance@ but got
>> the information that should contact also with freebsd-net at .
>>
>> 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. I've 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.
>>
>> I'm 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
>
>
> Hi,
>
> Maybe you want to take a loot at NETMAP :
> http://info.iet.unipi.it/~luigi/netmap/
> There is a libpcap wrapper library, so you can use it with unchanged
> pcap consumers,
> and get great performance increase.
> I'm not sure that the patches are updated for 8 and 9 though, since
> the initial commit to HEAD
> there were several related changes.
>
> P.S.: It is important also what is you packet rate, since 7.5Gbps
> with jumbo packets or 64 byte packets
> are very different things :)
>
> Regards,
> Nikolay

I forgot to answer the P.S.

Our switch shows that the peak was 2Mpps.

-- 
Marcin Markowski