Date: Wed, 13 Jan 2010 14:50:05 GMT From: Efstratios Karatzas <gpf.kira@gmail.com> To: freebsd-bugs@FreeBSD.org Subject: Re: bin/136759: iostat(8) displays wrong I/O statistics with -c 1 Message-ID: <201001131450.o0DEo5JA010380@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
The following reply was made to PR bin/136759; it has been noted by GNATS. From: Efstratios Karatzas <gpf.kira@gmail.com> To: bug-followup@freebsd.org, vovets@gmail.com Cc: Subject: Re: bin/136759: iostat(8) displays wrong I/O statistics with -c 1 Date: Wed, 13 Jan 2010 16:40:48 +0200 Hi there, This is definitely not a bug. Take a look at the freebsd man page for iostat(8) http://www.freebsd.org/cgi/man.cgi?query=iostat&apropos=0&sektion=8&manpath=FreeBSD+8.0-RELEASE&format=html The manual clearly states that : "The first statistics that are printed are averaged over the system uptime. To get information about the current activity, a suitable wait time should be specified, so that the subsequent sets of printed statistics will be averaged over that time." So the first line of statistics always contains the "average statistics" since the system started running. If you want to get the statistics for the next 5 secs try something like iostat -c 6 -d some_device Hope this helps -- Efstratios "GPF" Karatzas
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201001131450.o0DEo5JA010380>