[Click] userlevel performance

[Roman Chertov]

On Thu, 28 Oct 2010 13:58:50 -0700 Cliff Frey <cliff at meraki.com> wrote

> I don't have a setup that I can easily/quickly use to test.  All the same,
> I'm curious what the interface statistics do during this time on both of the
> interfaces (i.e. any errors?  how many packets transmitted/received)

[local]# click test2.click -h ctr1.count -h ctr2.count -h fd.count -h
fd.kernel_drops
ctr1.count:
100000

ctr2.count:
4503

fd.count:
0

fd.kernel_drops:
??

?? means that the number of kernel drops is unknown.

[local]# ethtool -S eth2
NIC statistics:
     rx_packets: 9
     tx_packets: 100011
     rx_bytes: 2749
     tx_bytes: 150401691
 
[local]# ethtool -S eth3
NIC statistics:
     rx_packets: 100004
     tx_packets: 17
     rx_bytes: 150400641
     tx_bytes: 3429
 
According to ethtool, all of the 100000 packets were sent and received w/o
issues (the extra packets are due to IPv6 when the interfaces came on).

So it looks like that problem is somewhere between Linux and Click getting the
packets to ToDevice.  I am curious what results Bejers will get.

Roman

> 
> Also, I'm curious what was going on inside of ToDevice and FromDevice.  The
> linuxmodule version of these elements have a bunch of counters (visible
> through the "calls" handler), it would be cool if the userlevel versions had
> these things too (i.e. run_select_count, packets for both, write_errors,
> empty_pulls for ToDevice,  recvfrom_errors, recvfrom_eagains for fromdevice)
> 
> I doubt it, but you also might get different behavior if you add a Queue
> between the ratedsource and the todevice.
> 
> Cliff
> 
> On Thu, Oct 28, 2010 at 10:55 AM, Roman Chertov <rchertov at cs.ucsb.edu>wrote:
> 
> > Hello,
> >
> > I was curious if anybody could try this test for me using userlevel click.
> >  I am
> > running CentOS 5.5 2.6.18-194.17.1.el5, and I have two network cards
> > connected
> > with a single cable.  If I run the script below using userlevel click,
> > FromDevice(eth3) will receive very few packets and the majority would end
> > up
> > dropped on input.
> >
> > src :: RatedSource(\<00>, LENGTH 1458, RATE 8000, LIMIT 100000)
> >    -> UDPIPEncap(10.0.1.1, 6667, 20.0.0.2, 6667)
> >    -> EtherEncap(0x0800, 00:30:48:F9:EA:7B, 00:17:cb:0d:f8:db)
> >    -> ctr1 :: AverageCounter
> >    -> ToDevice(eth2);
> >
> >
> > fd :: FromDevice(eth3, SNIFFER false, PROMISC true)
> >   -> ctr2 :: AverageCounter
> >   -> Discard;
> >
> > This script just requires ethX names to be changed; otherwise, it can be
> > run as
> > is.
> >
> > [root]# click test2.click -h ctr1.count -h ctr2.count
> > ctr1.count:
> > 100000
> >
> > ctr2.count:
> > 4482
> >
> > Roman
> >
> >
> > _______________________________________________
> > click mailing list
> > click at amsterdam.lcs.mit.edu
> > https://amsterdam.lcs.mit.edu/mailman/listinfo/click
> >