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@.
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
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