Re: git: b5a8abe9502e - main - How to show interface traffic in bits per second
Date: Tue, 03 Dec 2024 16:09:17 UTC
-------- John Baldwin writes: > > +When netstat reports every 8 seconds, it tells traffic in bits per second: > > + > > +$ netstat -I bge0 8 > > +% > > Hmm, I'm pretty sure it's in bytes, and checking the code, it seems like show_stat() > in netstat/if.c just shows the raw delta in values without scaling it by 'interval', > so I think the counts are the number of bytes sent/received in 8 seconds: And since bytes/8 seconds == bits/second Q.E.D > I do think having a tip about 'netstat -I foo <N>' is useful btw. I'm not sure if > you are trying to do [...] I have personally used this trick for 35+ years from V.22bis modems til 10Gbit/s ethernet, to figure out how saturated a particular transmission facility is. Transmission media are always in nominal bits per second, and counters are almost invariably in bytes, so using 8 second integration eliminates the need for math. The 8 second integration time also averages most of the burstiness of the traffic quite nicely. As the author of the bikeshed email, I should have known better than to commit something this trivial :-) Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.