Hi Roman, I tried both. The ring buffer is always 4096 in all the experiments I mentioned before. However, I tried higher values with txqueuelen=1000 only. I doubt higher values with txqueuelen will help. I will try that combination anyway.
Best Regards and Thanks, Yu On Thu, Jan 19, 2012 at 11:09:43AM -0800, rchertov wrote: > On 01.19.2012 11:06, Yu Chen wrote: > >1.8.0 on Linux 2.6.24.7. Yes, I played with it(from 1 to 8). However, > > Have you tried higher values like 16 and 32? Also, since you are > using Intel Pro NICs, you can use ethtool to increase the RX ring > buffer. ethtool -G ethX rx <SomeNumber> > > Roman > > > >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 _______________________________________________ click mailing list [email protected] https://amsterdam.lcs.mit.edu/mailman/listinfo/click
