[Click] 10GE Click performance

[rchertov]

> I wonder if you could print out what nskb->data_len is. It would also
> be great if you had some more time to investigate. Do you know what
> elements you plan to include in the data path?

I don't think the problem pertains to just the Myricom card.  I have an 
Intel Oplin dual port card (same chipset as needed for RouteBricks).  I 
connected both ports with a single loopback cable and ran the following 
config on CentOS5.4 running 2.6.24.7 patched kernel. (click was pulled 
from git last week commit: f91e115902a1792efca1592a90bb4ac95abaa7e2)

src1 :: RatedSource(LENGTH 2112, RATE 250000)
     -> UDPIPEncap(SRC 10.1.1.4, SPORT 6667, DST 10.1.1.2, DPORT 6667)
     -> EtherEncap(0x0800, 00:60:DD:47:94:2A, 00:15:17:7C:E4:A1)
     -> ctr1 :: AverageCounter
     -> td :: ToDevice(eth2, BURST 16);

fd :: FromDevice(eth3, PROMISC true, BURST 32)
    -> ctr2 :: AverageCounter
    -> Discard;


Without linearlize (250K pps)
chatter: skb_len: 2112  (I printed this in FromDevice got_skb())
more /click/ctr2/rate
250640


With linearlize
chatter: skb_len: 2112

more /click/ctr2/rate
173567



I don't have a well planned list of elements that I plan to use right 
now, but for right now, I am developing a few elements of my own to 
support bridging for a high-speed UDP data flow.

Roman