packet loss
Brecht Vermeulen
brecht.vermeulen at UGent.be
Wed Jun 25 22:50:19 EDT 2003
Hi,
can you try to add
PollDevice(eth1) -> Discard;
at the sending host also ?
Don't know if this will make a difference though.
regards,
Brecht
> FastUDPSource(100000, 1000000, 1024,
> 00:02:b3:b6:c4:de, 192.168.0.1, 1234,
> 00:02:b3:b6:c5:31, 192.168.0.2, 1234)
> ->ToDevice(eth1);
>
> Receiving host:
>
> PollDevice(eth0,true)
> ->c0::Classifier(6/0002b3b6c4de,-)
>
> c0[0]
> ->Counter
> ->Discard;
>
> c0[1]
> ->Idle
> ->ToDevice(eth0);
>
> Quot
>
> ing Brecht Vermeulen <brecht.vermeulen at UGent.be>:
>
> >
> > Hi,
> >
> > hmmm, not sure that the card is the problem. I have no experience with
> > UDPsource. What happens if you use bigger packets ?
> >
> > What is the PCI bus to which the card is connected (64 bits - 66 MHz ?
> > or even higher ?) ?
> >
> > What is now the exact click configuration you use at both PCs ?
> >
> > I assume you're using the patched e1000 driver ?
> > Can you see something the /proc/PRO_LAN statistics ?
> >
> >
> > regards,
> > Brecht
> >
> > Shilpi Agarwal wrote:
> > >
> > > Hi Brecht!!
> > >
> > > Thank you for your email.I tried to check output of ifconfig after each
> > test and
> > > i found that error is at the transmittor. Its not sending all the packets.
> > >
> > > receiver is able to receive packtes without any loss. Then i increased the
> > > number o Tx Descriptors at the transmittor and here are some of the
> > results
> > > for rate 100 thousand pps and packets size 64 bytes.
> > >
> > > Tx Descriptor Packets sent by UDp source Packtes sent by NIC
> > > 256 100,0000 996094
> > > 512 998098 998098
> > > 1024 999068 999068
> > > 2048 999540 999540
> > > 4096 999778 999778
> > >
> > > It clearly indicates that the problem is at NIC. I have Pentium 4 , 2.53
> > Ghz
> > > processor and network adaptor is Intel Pro/1000 T Desktop RJ45.
> > >
> > > I looked at message-
> > > http://www.pdos.lcs.mit.edu/click/ml/click/msg01900.html
> > >
> > > It looks like Tulip cards are faster tahn intel. Do you think i might get
> > rid of
> > > this loss by using Tulip cards?? Or which card would be best ??
> > >
> > > Thanks
> > > Shilpi
> > >
> > > Quoting Brecht Vermeulen <brecht.vermeulen at UGent.be>:
> > >
> > > >
> > > > I'm not sure, but ifconfig says the number of packets (I don't know if
> > > > those rejected are included or not) and some drivers, e.g. e1000 have
> > > > some statistics read of the cards in /proc/PRO_LAN (or something like
> > > > that).
> > > >
> > > > don't know for sure. If you are connected to a switch, do you know the
> > > > number then ?
> > > >
> > > > Maybe you can try a counter on the sending machine also if you haven't
> > > > already.
> > > >
> > > > I don't know exactly what rejected packets mean. I have seen it here on
> > > > non-click machines with cheap network cards (dlink e.g.)
> > > >
> > > > regards,
> > > > Brecht
> > > >
> > > > Shilpi Agarwal wrote:
> > > > >
> > > > > Hi,
> > > > >
> > > > > I ran dmesg on sending host and i saw the message eth1 rejected a
> > packet.
> > > > b
> > > > > Does this mean it rejected only one packet or lot of packets.
> > > > >
> > > > > If the machines are connected directly how can i measure the number of
> > > > packets
> > > > > actually sent by device driver.
> > > > >
> > > > > Quoting Brecht Vermeulen <brecht.vermeulen at UGent.be>:
> > > > >
> > > > > >
> > > > > > Hi,
> > > > > >
> > > > > > and which packet length are you using ? (can you give the config of
> > the
> > > > > > sending host)
> > > > > > Try using packets of e.g; 1400 bytes.
> > > > > >
> > > > > > Have you tried to connect both PCs without a switch (crossed cable
> > ?)
> > > > > > Is it 10/100 ethernet ?
> > > > > >
> > > > > > Can you see statistics on the switch ? (to be sure that the sending
> > host
> > > > > > is sending all packets)
> > > > > >
> > > > > > regards,
> > > > > > Brecht
> > > > > >
> > > > > > Shilpi Agarwal wrote:
> > > > > > >
> > > > > > > Hi,
> > > > > > >
> > > > > > > Thanks for your email, i have tried that
> > > > > > > I have tried with configuration like
> > > > > > >
> > > > > > > PollDevice(eth0,true)
> > > > > > > ->c0::Classifier(6/0002b3b6c4de,-)
> > > > > > >
> > > > > > > c0[0]
> > > > > > > ->Counter
> > > > > > > ->Discard;
> > > > > > >
> > > > > > > c0[1]
> > > > > > > ->Idle
> > > > > > > ->ToDevice(eth0);
> > > > > > >
> > > > > > > But i still see the same packet loss. At a rate till 15 thousand
> > pps
> > > > its
> > > > > > fine ,
> > > > > > > afterwards it starts lossing packets. At 100 thousand pps loss is
> > .38%
> > > > and
> > > > > > it
> > > > > > > remains between .28 & .36% till 600 thousands pps, which is
> > maximum
> > > > sending
> > > > > > rate
> > > > > > > i could get.
> > > > > > >
> > > > > > > And other thing is Using one single interface and default value of
> > > > > > transmit
> > > > > > > descriptor i could achieve maximum send rate of 385.356 thousand
> > pps.
> > > > > > > When i tried to use both the interfaces of a machine to send
> > packets
> > > > the
> > > > > > total
> > > > > > > maximum send rate i can get is 585 thousand pps.
> > > > > > >
> > > > > > > I think it should be double of 385 since each device works
> > > > independently.
> > > > > > >
> > > > > > > Thanks
> > > > > > > Shilpi
> > > > > > >
> > > > > > > Quoting Brecht Vermeulen <brecht.vermeulen at UGent.be>:
> > > > > > >
> > > > > > > >
> > > > > > > > Hi,
> > > > > > > >
> > > > > > > > and did you try Eddie's answer to your previous question ?
> > > > > > > > http://www.pdos.lcs.mit.edu/click/ml/click/msg02004.html
> > > > > > > >
> > > > > > > > (not sure if that is the problem though)
> > > > > > > >
> > > > > > > > regards,
> > > > > > > > Brecht
> > > > > > > >
> > > > > > > > Shilpi Agarwal wrote:
> > > > > > > > >
> > > > > > > > > Hi,
> > > > > > > > >
> > > > > > > > > i did a small experiment to check the maximum packet
> > handling
> > > > rate.
> > > > > > > > >
> > > > > > > > > I have two machines running click.
> > > > > > > > >
> > > > > > > > > On one machine i have
> > > > > > > > > UDPsource and in other machine i just have
> > > > > > > > >
> > > > > > > > > PollDevice(eth0,true)
> > > > > > > > > ->Counter
> > > > > > > > > ->Discard;
> > > > > > > > >
> > > > > > > > > The two nodes are connected via switch.
> > > > > > > > >
> > > > > > > > > Now i am sending 100,0000 packets at a rate of 100 thousand pps
> > but
> > > > at
> > > > > > the
> > > > > > > > sink
> > > > > > > > > i never receive all packets .Counter always show around
> > 996138.
> > > > > > > > > even if i reduce the sending rate to 20 thousand pps still i
> > am
> > > > not
> > > > > > > > receiving
> > > > > > > > > all the packets . At 20 thousand pps i could receive only
> > 996181
> > > > > > packets.
> > > > > > > > >
> > > > > > > > > does anyone have an idea why i am loosing packets??
> > > > > > > > >
> > > > > > > > > Thanks
> > > > > > > > > Shilpi
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > Shilpi Agarwal
> > > > > > > > > Graduate Student
> > > > > > > > > Dept of Electrical Engineering
> > > > > > > > > University of Wisconsin
> > > > > > > > > Madison-53706
> > > > > > > > > phone:608-233-3714
> > > > > > > >
> > > > > > >
> > > > > > > Shilpi Agarwal
> > > > > > > Graduate Student
> > > > > > > Dept of Electrical Engineering
> > > > > > > University of Wisconsin
> > > > > > > Madison-53706
> > > > > > > phone:608-233-3714
> > > > > >
> > > > >
> > > > > Shilpi Agarwal
> > > > > Graduate Student
> > > > > Dept of Electrical Engineering
> > > > > University of Wisconsin
> > > > > Madison-53706
> > > > > phone:608-233-3714
> > > >
> > >
> > > Shilpi Agarwal
> > > Graduate Student
> > > Dept of Electrical Engineering
> > > University of Wisconsin
> > > Madison-53706
> > > phone:608-233-3714
> >
>
> Shilpi Agarwal
> Graduate Student
> Dept of Electrical Engineering
> University of Wisconsin
> Madison-53706
> phone:608-233-3714
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