Simple click config is VERY slow on our system; also the PollDevice doesn't work on our tulip.

[Brecht Vermeulen]

Hi Eric,

I don't know if this will solve all you problems, but in each case,
IPClassifier is made to classify IP packets. You handle here ethernet
packets to it and you should use Classifier (the ethernet header is still
in front). Or you have to strip(14) the ethernet header, but then you need
again a Etherencap before you hand it to linux.

regards,
Brecht



 On
Fri, 1 Mar 2002, Eric Freudenthal wrote:

> As I indicated earlier, we're building a router that imposes delays.  When
> we just let linux forward, we see round-trip ping latencies of 200-300us.
> When we insert the following minimal click config, we don't notice any
> slow-down:
>
> FromDevice(eth1) -> cc :: IPClassifier(src 1.1.1.1, dst 1.1.1.1, -);
> cc[0] -> ToLinux;  // not used
> cc[1] -> ToLinux;  // not used
> cc[2]  // everything comes here
>  -> ToLinux;
>
> However, a that inserts 10 latency/bandwidth limiter blocks (see end of this
> note) adds an amazing 10ms, with a very large variance (we often see
> 30-70ms).  As before, there is no network traffic other than the pings.
>
> Also: the PollDevice(eth1) doesn't work for us (we're using a tulip nic)-
> the click task fails, and the kernel becomes unstable as soon as we try.
> (RH7.1, linux 2.2.19).  Perhaps we're building our kernel with a subtly
> incompatible config?  Maybe we should try one of your configs; Could you tar
> up a configured kernel source tree that works for us to try?
>
> Thanks, Eric
>
>
> - - - - - t e a r   h e r e - - - - -
> FromDevice(eth1) -> cc :: IPClassifier(src 1.1.1.1, dst 1.1.1.1, -);
> cc[0] -> ToLinux;
> cc[1] -> ToLinux;
> cc[2]
>
>  -> IPClassifier(src 172.31.0.0/16) [0]
>  -> Queue(256)
>  -> BandwidthShaper(100000000)
>  -> SetTimestamp
>  -> DelayUnqueue(0.00001s)
>
>  -> IPClassifier(src 172.31.0.0/16) [0]
>  -> Queue(256)
>  -> BandwidthShaper(100000000)
>  -> SetTimestamp
>  -> DelayUnqueue(0.00001s)
>
>  -> IPClassifier(src 172.31.0.0/16) [0]
>  -> Queue(256)
>  -> BandwidthShaper(100000000)
>  -> SetTimestamp
>  -> DelayUnqueue(0.00001s)
>
>  -> IPClassifier(src 172.31.0.0/16) [0]
>  -> Queue(256)
>  -> BandwidthShaper(100000000)
>  -> SetTimestamp
>  -> DelayUnqueue(0.00001s)
>
>  -> IPClassifier(src 172.31.0.0/16) [0]
>  -> Queue(256)
>  -> BandwidthShaper(100000000)
>  -> SetTimestamp
>  -> DelayUnqueue(0.00001s)
>
>  -> IPClassifier(src 172.31.0.0/16) [0]
>  -> Queue(256)
>  -> BandwidthShaper(100000000)
>  -> SetTimestamp
>  -> DelayUnqueue(0.00001s)
>
>  -> IPClassifier(src 172.31.0.0/16) [0]
>  -> Queue(256)
>  -> BandwidthShaper(100000000)
>  -> SetTimestamp
>  -> DelayUnqueue(0.00001s)
>
>  -> IPClassifier(src 172.31.0.0/16) [0]
>  -> Queue(256)
>  -> BandwidthShaper(100000000)
>  -> SetTimestamp
>  -> DelayUnqueue(0.00001s)
>
>  -> IPClassifier(src 172.31.0.0/16) [0]
>  -> Queue(256)
>  -> BandwidthShaper(100000000)
>  -> SetTimestamp
>  -> DelayUnqueue(0.00001s)
>
>
> -> ToLinux;
>
>