Re: Packet loss with PollDevice
Yu Chen <[email protected]>
| Newsgroups | gmane.network.routing.click |
|---|---|
| Message-ID | <[email protected]> |
1.8.0 on Linux 2.6.24.7. Yes, I played with it(from 1 to 8). However, it does not seem to help much. Yes, polldevice::count is smaller than the packets I sent to that interface. Also, the packet size 64B. I forgot to mention it in the previous emails. Best Regards and Thanks, Yu On Thu, Jan 19, 2012 at 10:59:14AM -0800, rchertov wrote: > What version of click are you running? Also, you can play around with > BURST parameter to PollDevice. So are you observing that > polldevice::count is smaller than the number of packets you sent to that > interface? > > Roman > > On 01.19.2012 10:45, Yu Chen wrote: > > Hi all, > > > > I am having an experiment with the following topology running on > > Deterlab. I > > am having a 4-core Xeon and modified e1000 driver running ore Xeon > > and modified > > e1000 driver running. The memory is 4GB. > > > > User1 > > | > > User3-----Router------User4 > > | > > User2 > > > > User 1 is sending packet to User 2; User 3 is sending packets to User > > 4. > > The router only routes stuff with best effort. However, what I > > observed is > > very few losses, distributed on a small random set of rounds. What is > > surprising is that there are losses on one particular netcard when > > the sending > > rate is only 125,000 packets/second. The loss happens at the > > receiving phase. > > > > Below is what I have tried: > > 1' I am using 4 threads, each corresponding to one pair of PollDevice > > and > > ToDevice. > > 2' I have changed the queue length at the interface cards. I set > > txqueuelen=1 > > for the senders to decrease the possible burstiness. By increasing > > the > > receiving queue length from 64 to 4096 > > (the maximum queue length), the loss rate decreases. > > 3' I tried to discard the packets on their arrival at the router. In > > this case, > > there is no observed loss. > > > > I am kind of lost at the point. Any suggestions on what can be the > > possible > > reason and what I can try next? > > > > Attached is my code. > > > > Best Regards, > > Yu > > > > Router: > > > > ----------------------------------------------------------------------- > > ddressInfo(router1-w1 10.0.1.1 00:15:17:5d:16:4a, > > //eth2 > > user1-w1 10.0.1.2 00:15:17:5d:29:28, //eth0 > > router1-w2 10.0.2.1 00:15:17:5d:16:48, //eth0 > > user2-w2 10.0.2.2 00:15:17:57:ce:14, //eth0 > > router1-w3 10.0.3.1 00:15:17:5d:16:4b, //eth3 > > user3-w3 10.0.3.2 00:15:17:5d:27:e8, //eth0 > > router1-w4 10.0.4.1 00:15:17:5d:16:49, //eth1 > > user4-w4 10.0.4.2 00:15:17:5d:2a:3c, //eth0 > > ); > > > > c1 :: Classifier(12/0806 20/0001, > > 12/0806 20/0002, > > 12/0800, > > -); > > c2 :: Classifier(12/0806 20/0001, > > 12/0806 20/0002, > > 12/0800, > > -); > > c3 :: Classifier(12/0806 20/0001, > > 12/0806 20/0002, > > 12/0800, > > -); > > c4 :: Classifier(12/0806 20/0001, > > 12/0806 20/0002, > > 12/0800, > > -); > > > > q0 :: Discard; > > // Idle -> ToDevice(eth1); > > // Idle -> ToDevice(eth3); > > // Idle -> ToDevice(eth2); > > // Idle -> ToDevice(eth0); > > q1 :: CPUQueue(1000000) -> EtherEncap(0x0800, router1-w1, user1-w1) > > -> td1 :: ToDevice(eth2); > > q2 :: CPUQueue(1000000) -> EtherEncap(0x0800, router1-w2, user2-w2) > > -> td3 :: ToDevice(eth0); > > q3 :: CPUQueue(1000000) -> EtherEncap(0x0800, router1-w3, user3-w3) > > -> td2 :: ToDevice(eth3); > > q4 :: CPUQueue(1000000) -> EtherEncap(0x0800, router1-w4, user4-w4) > > -> td0 :: ToDevice(eth1); > > > > rt :: LookupIPRouteMP(10.0.1.0/32 0, 10.0.1.1/32 0, 10.0.1.255/32 0, > > 10.0.2.0/32 0, 10.0.2.1/32 0, 10.0.2.255/32 0, > > 10.0.3.0/32 0, 10.0.3.1/32 0, 10.0.3.255/32 0, > > 10.0.4.0/32 0, 10.0.4.1/32 0, 10.0.4.255/32 0, > > 10.0.1.0/24 1, 10.0.2.0/24 2, 10.0.3.0/24 3, > > 10.0.4.0/24 4, 0.0.0.0/0 0); > > rt[0] -> Discard; > > rt[1] -> q1; > > rt[2] -> q2; > > rt[3] -> q3; > > rt[4] -> q4; > > > > pd1 :: PollDevice(eth2) -> c1; > > c1[0] -> q0; > > c1[1] -> q0; > > c1[2] -> DropBroadcasts -> Strip(14) -> GetIPAddress(16) -> rt; > > c1[3] -> Discard; > > > > pd3 :: PollDevice(eth0) -> c2; > > c2[0] -> q0; > > c2[1] -> q0; > > c2[2] -> DropBroadcasts -> Strip(14) -> GetIPAddress(16) -> rt; > > c2[3] -> Discard; > > > > pd2 :: PollDevice(eth3) -> c3; > > c3[0] -> q0; > > c3[1] -> q0; > > c3[2] -> DropBroadcasts -> Strip(14) -> GetIPAddress(16) -> rt; > > c3[3] -> Discard; > > > > pd0 :: PollDevice(eth1) -> c4; > > c4[0] -> q0; > > c4[1] -> q0; > > c4[2] -> DropBroadcasts -> Strip(14) -> GetIPAddress(16) -> rt; > > c4[3] -> Discard; > > > > StaticThreadSched(pd2 0, td0 0, pd0 1, td2 1, pd3 2, td1 2, pd1 3, > > td3 3); > > > > User: > > // > > AddressInfo(router1-w1 10.0.1.1 00:15:17:5d:16:4a, > > //eth2 > > user1-w1 10.0.1.2 00:15:17:5d:29:28, //eth0 > > router1-w2 10.0.2.1 00:15:17:5d:16:48, //eth0 > > user2-w2 10.0.2.2 00:15:17:57:ce:14, //eth0 > > router1-w3 10.0.3.1 00:15:17:5d:16:4b, //eth3 > > user3-w3 10.0.3.2 00:15:17:5d:27:e8, //eth0 > > router1-w4 10.0.4.1 00:15:17:5d:16:49, //eth1 > > user4-w4 10.0.4.2 00:15:17:5d:2a:3c, //eth0 > > ); > > //Send > > udp :: FastUDPSource(RATE 400000, LIMIT 20000000, LENGTH 78, > > SRCETH user1-w1, SRCIP user1-w1, SPORT 1, > > DSTETH router1-w1, DSTIP user2-w2, DPORT 1, > > CHECKSUM false, INTERVAL 0, ACTIVE false) > > -> ToDevice(eth0); > > > > s :: Script(TYPE ACTIVE, write ctr.reset, write udp.active false, > > wait 1, wait 9, write udp.active true); > > > > > > _______________________________________________ > > click mailing list > > [email protected] > > https://amsterdam.lcs.mit.edu/mailman/listinfo/click > > _______________________________________________ > click mailing list > [email protected] > https://amsterdam.lcs.mit.edu/mailman/listinfo/click