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Date:      Fri, 11 Apr 2003 10:13:30 +0200
From:      Andreas Klemm <andreas@freebsd.org>
To:        Peter Jeremy <peterjeremy@optushome.com.au>
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: Solaris 2.x compat. system accounting, sarcheck for fbsd (commercial)
Message-ID:  <20030411081330.GA918@titan.klemm.apsfilter.org>
In-Reply-To: <20030411080102.GC47320@cirb503493.alcatel.com.au>
References:  <20030411060823.GA27575@titan.klemm.apsfilter.org> <20030411080102.GC47320@cirb503493.alcatel.com.au>

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On Fri, Apr 11, 2003 at 06:01:03PM +1000, Peter Jeremy wrote:
> On Fri, Apr 11, 2003 at 08:08:23AM +0200, Andreas Klemm wrote:
> >I wrote some performance monitoring utilities and need for
> >example a parameter wait for I/O, that I didn't find in our
> >tools, did I overlook something ?
>=20
> "wait for I/O" is a System-V state that BSD doesn't measure.
> One of the grey[er] beards may be able to answer why SysV does
> and BSD doesn't consider "wait for I/O" a state worth measuring.

Would be interested to hear why, since I think its an interesting
parameter. At least I know of some sun consultants who are the
opineon, that this is an important parameter.

If I understood the parameter right it should bring you a=20
value, who measures how often (in percentage) the CPU had
to wait for I/O operations. Not only disk, additionally
network I/O as well (from hearsay) but Im not 100% sure about
it. So theoretically it should bring to you a value, if you
are I/O bound. Togehter with other values (disk I/O and Network
stats it should be easy to see, if you have a problem with your
disks or with your network).

BTW, are there some automatic tools around for BSD, that=20
automate the process of telling you, where you have problems
with your machine or what kernel parameters need an update ??

	Andreas ///

--=20
Andreas Klemm - Powered by FreeBSD 4.7
Need a magic printfilter today ? -> http://www.apsfilter.org/

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