From owner-freebsd-bugs  Fri Jul 16 12:16:56 1999
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Subject: Re: bin/115: systat iostat display doesn't scale high enough
In-Reply-To: <199907161804.LAA74742@idiom.com> from David Muir Sharnoff at "Jul 16, 1999 11:04:57 am"
To: support@idiom.com (David Muir Sharnoff)
Date: Fri, 16 Jul 1999 13:15:35 -0600 (MDT)
Cc: n_hibma@FreeBSD.ORG, freebsd-bugs@FreeBSD.ORG
From: "Kenneth D. Merry" <ken@plutotech.com>
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David Muir Sharnoff wrote...
> * Synopsis: systat iostat display doesn't scale high enough
> * 
> * State-Changed-From-To: suspended->closed
> * State-Changed-By: n_hibma
> * State-Changed-When: Fri Jul 16 10:15:48 PDT 1999
> * State-Changed-Why: 
> * Systat has been updated to use Mb/s instead of bps. On a system here it 
> * kind of  represents the right thing at 6Mb/s (as accurate as you get on an
> * ASCII display).
> * 
> * For the record, this PR was filed on
> * 
> * 	Sat Jan 14 03:40:02 1995
> * 
> * :-)
> 
> I don't think you should close that problem report.
> 
> This snapshot from :iostat taken today.  
> 
>           /0   /5   /10  /15  /20  /25  /30  /35  /40  /45  /50
> da0   MB/s
>       tps|XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX51.70
> da1   MB/sX  
>       tps|XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX127.75
> da2   MB/s
>       tps|XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
[ ... ]

> systat still doesn't scale high enough.

The problem here is that the scale at the top has to work for three
different things -- megabytes per second, transactions per second, and
kilobytes per transaction.

We could make the scale larger, so that you get a better picture of
transactions per second, but then the scale would be off for megabytes per
second on most systems.  (kilobytes per transaction as well)

Really, IMO, the standard systat -iostat display isn't very useful.  I
think the :numbers version of the display is more useful, and easier
to read.

The -vmstat display gives you more overall information, and iostat(8) is
better for long term statistics gathering.

Ken
-- 
Kenneth Merry
ken@plutotech.com


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