[OT] tcpdump overhead
Hello; I am doing a final paper for my post-graduate studies. The paper is about QOS on a corporate environment. One of the issues involved in the network measurements I am going to make is how much overhead tcpdump will have on them (if any). It seems to me that this overhead can be disregarded as influential but, if this is right, I need some proper source that I can quote and index on my paper. Could anyone show some directions for any official documentation on this? or maybe some opinions, sugestions from you guys on this subject that I could officially put on this paper? well, thanks and sorry for this off-topic. Mario Lobo ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: [OT] tcpdump overhead
make is how much overhead tcpdump will have on them (if any). It seems to me that this overhead can be disregarded as influential but, if depends how kmuch packets are actually gathered. if you tcpdump everything from loaded gigabit link it won't be small. you will have to use at least 2-disk stripping to be able to write data ;) i don't know if it's official docs, just generate some traffic, observe how much CPU is idle, then add tcpdump to the mix and do the math. simple ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
[OT?] tcpdump overhead
Hi there; Forgive this possible OT (and lame) question. I am writing a final paper for a PG course and I need to take precise measurements on network performance. I gonna be doing lots of packet dumps and I would like to know you guys' opinion on how much of tcpdump overhead (if meaningful for these measurements) I should take into account. If there are any readings on the subject you could point me to... Thanks -- Mario Lobo Segurança de Redes - Desenvolvimento e Análise IPAD - Instituto de Pesquisa e Apoio ao Desenvolvimento Tecnológico e Científico ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: [OT?] tcpdump overhead
I am writing a final paper for a PG course and I need to take precise measurements on network performance. I gonna be doing lots of packet dumps and I would like to know you guys' opinion on how much of tcpdump overhead (if meaningful for these measurements) I should take into account. If there are any readings on the subject you could point me to... no idea but small for sure. it would rather cause tcpdump to not catch all packets that network performance drop. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: [OT?] tcpdump overhead
On Monday 10 March 2008, you wrote: I am writing a final paper for a PG course and I need to take precise measurements on network performance. I gonna be doing lots of packet dumps and I would like to know you guys' opinion on how much of tcpdump overhead (if meaningful for these measurements) I should take into account. If there are any readings on the subject you could point me to... no idea but small for sure. it would rather cause tcpdump to not catch all packets that network performance drop. Thanks for the reply Wojciech. Forgive my english but I couldn't quite get what you meant by: it would rather cause tcpdump to not catch all packets that network performance drop. Could you rephrase that for me please ? Thanks -- Mario Lobo Segurança de Redes - Desenvolvimento e Análise IPAD - Instituto de Pesquisa e Apoio ao Desenvolvimento Tecnológico e Científico ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
