[ns] Is there a data rate limitation for ns emulate?
Hello, I want to build a scenrio to emulate video streaming. my real network topology is: A- - - - B- - - - -C The NS was installed on Computer B. The data rate is relative big(more than 30Mb/s). There is always warnings RealTimeScheduler: warning:slop ... exceed limit And some packets are lost, but the bandwith is enough to transmit the video data. Could anyone tell me if there is a data rate limitation for ns emulate? Any advice would be appreciated. Thanks. Jerry
[ns] scheduling error in eurane
hello, will somebody pls tell me how to simulate multi-user in eurane using DCH channel.(eg 6 UE using DCH). whenever i try to simulate with multi-users i get an error saying scheduler going backwards in time from 15.0014 to 15.0012 i removed abort(); from (t clock _) statement in scheduler.cc but then i get error segmentation fault; core dumped. thanks in advance ritesh - Pinpoint customers who are looking for what you sell.
Re: [ns] Is there a data rate limitation for ns emulate?
jerry zhao schrieb: I want to build a scenrio to emulate video streaming. my real network topology is: A- - - - B- - - - -C The NS was installed on Computer B. The data rate is relative big(more than 30Mb/s). There is always warnings RealTimeScheduler: warning:slop ... exceed limit And some packets are lost, but the bandwith is enough to transmit the video data. Could anyone tell me if there is a data rate limitation for ns emulate? Any advice would be appreciated ns-2 defines no limitation. However, ns-2 needs to process data packets almost in real-time and hence is limited by the speed of your hardware / operating system. If you emulate a wired network ns-2 will perform quite well. But for a wireless network performance requirements are much stronger (standard ns-2 will not be able to work at all for wireless networks in most cases). But even if your CPU is fast enough, the operating system can introduce short but significant delays. To avoid them you should try the following: - set ns-2 to run with real-time priority - disable tracing - use a multi-core / CPU system and pin ns-2 to one CPU / core - disable other applications that write to the disk - if you need tracing, buffer output in memory (ram disk) For high-throughput emulations of wired networks you should consider a different emulator like NIST Net. This should improve your results. Daniel. -- Dr.-Ing. Daniel Mahrenholz rt-solutions.de GmbH Oberländer Ufer 190a D-50968 Köln Web: www.rt-solutions.de rt-solutions.de networks you can trust.
[ns] validation results failed...
Hello everyone, I have installed successfully all the necessary packages but when iam validating it shows that some tests failed like ./test-all-simultaneous ./test-all-xcp . I tried to re-run both the tests but it again shows that some tests failed.It would be really great if you can help me how to fix this problem. Thanking you, Susheela Gadi -- Susheela Gadi E-mail:[EMAIL PROTECTED] Cell:610-570-3440
[ns] Problems running NS2 Emulation
Dear Ping, I was searching the whole day, and finally I got it working in my system. The first thing you have to do is to compile the nse (the emulator). It was quite tricky in my case. I had to install the libpcap packet before, and change some files. There is a good guide (in german) at http://www.welzl.at/research/projects/testbedeval/Bakkalaureatsarbeit_Klotz-Sigl.doc. These are the steps I took: 1) try to compile the nse from /ns-x.xx folder: make nse 2) in my case it didnt work, I had then to download the libpcap from adept manager (I am using kubuntu) or from http://www.tcpdump.org/ 3) I still got some errors and I had to alter the Makefile.in (NOT the Makefile!). Since we dont know which .o files are needed, all object files you find in your libcap folder must be included here: $NSE): $(OBJ) ... (LINK) $(LDFLAGS) $(LDOUT)$@ \ /usr/libcap-0.7.2/bpf_dump.o \ /usr/libcap-0.7.2/bpf_filter.o \ /usr/libcap-0.7.2/bpf_image.o \ /usr/libcap-0.7.2/etherent.o \ /usr/libcap-0.7.2/gencode.o \ /usr/libcap-0.7.2/... .o \ ... common/tclAppInit.o $(OBJ) \ (OBJ_EMULATE_CC) $(OBJ_EMULATE_C) $(LIB) 4) ./configure 5) make nse After that, you can use the emulator calling nse .tcl Hope it solves your problem. Best reagards, Rodrigo
[ns] tcp.cc/tcp-sink.cc with varying packet size
Hi all, I was just wondering whether someone has a version of one-way TCP that supports sending and receiving packets of different size (the ns implementation always rounds up to packetSize_ bytes). I know there is FullTCP, but I need one-way TCP in order to be able to use new CUBIC/BIC/etc. congestion control protocols (available from: http://www.cs.caltech.edu/~weixl/technical/ns2linux/index.html). Or maybe anyone knows how to use these new protocols with FullTCP ? Cheers, Bartek
Re: [ns] please help me to install IEEE 802.11e HCCA.
Hi BJ To make the number 4 of process you should make the following: you should save the patch in a file archive for example into the /home and then you go to the terminal and executing the following command: cd /home/ns-allinone-2.29/ns-2.29 when you make this, you enter to working directory of ns-2.29, then, from this working directory you should search the patch that you saved in /home and apply it by executing the following command: gzip -dc /home/ns2hcca-2.29-060823.patch.gz | patch -Np1 then, from the working directory of ns-2.29 you should execute the following commands: ./configue make clean make best regards Jorge Bustos ByungJoon Oh wrote: Dear All NS-users, I try to install ns2hcca source code decribed with website: http://info.iet.unipi.it/~cng/ns2hcca/ However, I can't install about that. As described this website, I have followed the precedure of installation. But, I can't make sense of Number 4 of process. (attached by pic file). please advice me to get a clue. Thank you in advance. Best regards, BJ, -- View this message in context: http://www.nabble.com/please-help-me-to-install-IEEE-802.11e-HCCA.-tf4250733.html#a12171329 Sent from the ns-users mailing list archive at Nabble.com.
[ns] node transmission range in ns2
hi, I am using ns-allinone-2.31, 802.15.4. how do I set the transmssion range of one node? Thanks for reply, chris - Ready for the edge of your seat? Check out tonight's top picks on Yahoo! TV.
[ns] request for tcl script
hi i am murugesh.i planned to implement priority scheduler in IEEE802.11B(MAC LAYER)using fuzzy logic .for that i need some parameter such as expiry time,queue length,data rate from each packet.if any one know send it in the form of tcl script or related idea. thanks in advance regards murugesh -- View this message in context: http://www.nabble.com/request-for-tcl-script-tf4240915.html#a12067372 Sent from the ns-users mailing list archive at Nabble.com.
[ns] need of ideas
i have my problem in scheduling ie using interframe space technique.. this involves calculating of finished tag value for each packet,and in accordance with the finish tag value ie mapped to IFS. ie smaller finish tag is mapped to smaller ifs and is transmitted first.. whether this concept can be implemented.. waiting for any suggestions and ideas.. tcl script is also in need.. - Unlimited freedom, unlimited storage. Get it now
