[Click] Updated To/FromUserDevice tests

[Eddie Kohler]

Thanks Roman, as you may have noticed these changes did get merged!

Eddie


On 5/23/11 1:34 PM, Roman Chertov wrote:
> Finally I had the time to test the changes the Cliff made to
> To/FromUserDevice elements.  I have tried the elements using on patched
> 2.6.24.7 and Fedora14 patchless kernels.  In both cases, I was able to
> capture ~1Gbps in my userlevel application.  The userlevel application
> just reads the data from the ToUserDevice ring buffer and then discards
> it.  If the data cannot be read fast enough from ToUserDevice, then the
> ring buffer would overflow and drop_count would indicate the number of
> dropped packets.  The stats shown below demonstrate that no drops
> occurred and the entire stream was read by the user level app.  However,
> in order to achieve this performance I had to increase the BURST and
> CAPACITY parameters.
>
> I recommend that the changes made by Cliff be merged with the mainline.
>
>
> Receiver Stats
> [rchertov at nm0:~/pkt_reader]$ more /click/ctr/rate
> 82004
> [rchertov at nm0:~/pkt_reader]$ more /click/ctr/count
> 833000
> [rchertov at nm0:~/pkt_reader]$ more /click/ToUserDevice\@3/drop_count
> 0
>
>
> Receiver Config
> pd :: FromDevice(eth21)
>      ->  ctr :: AverageCounter
>      ->  ToUserDevice(0, CAPACITY 512, ENCAP len32, BURST 10);
>
> Idle ->  ToDevice(eth21);
>
>
> Sender Config
>
> src1 :: RatedSource(\<010101010101010101010101010101010101010101010101>,
> LENGTH
> 1458, RATE 83000, LIMIT 833000)
>       ->  UDPIPEncap(SRC 10.1.1.3, SPORT 6667, DST 10.1.1.7, DPORT 6667)
>       ->  SetIPDSCP(46)
>       ->  EtherEncap(0x0800, 00:15:17:7C:E5:15, 00:15:17:7C:E3:B1)
>       ->  StoreUDPTimeSeqRecord(OFFSET 14, DELTA false)
>       ->  ctr :: AverageCounter
>       ->  ToDevice(eth1);
>
>
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