[Click] Packet loss with PollDevice
Yu Chen
yuchen at cs.duke.edu
Thu Jan 19 14:06:52 EST 2012
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);
> >
> >
> > _______________________________________________
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> > click at amsterdam.lcs.mit.edu
> > https://amsterdam.lcs.mit.edu/mailman/listinfo/click
>
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