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Message-ID: <32EFE339.31DFF4F5@whistle.com>
Date: Wed, 29 Jan 1997 15:54:33 -0800
From: Julian Elischer <julian@whistle.com>
Organization: Whistle Communications
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To: Joerg Wunsch <joerg_wunsch@uriah.heep.sax.de>
CC: Simon Shapiro <Shimon@i-Connect.Net>, hackers@freebsd.org
Subject: Re: More 2.2-BETA goodies...
References: <XFMail.970129120959.Shimon@i-Connect.Net> <Mutt.19970129220350.j@uriah.heep.sax.de>
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J Wunsch wrote:
> 
> As Simon Shapiro wrote:
> 

> 
> Shortcut: umount /devs
> 
> Known sucker.  DEVFS is really not yet ready for the masses.  (Alas.)
damm! I tought I fixed that!

oh well 
hpefully I'll get back to it again..

> 
> > 5.  Question:  Using xperfmon++ (cool), one observes that a system equipped
> >     with AHA2940W enjoys about 3-15 times as many interrupts/sec as disk
> >     transfers/sec.  The system, does nothing but SCSI right now (cvs
> >     checkout in parallel with a tape backup (cpio, I know...).
> >     Nothing else.
> >
> >       Discounting
> >     100 interrupts for the heartbeat, ...
> 
> You have to discount 100 + 128 interrupts per second, there are two
> clocks.  If you're using pcaudio, this increases to 100 + 1024 while
> pcaudio is running.

actually thats 16000 for pcaudio
it interrupts twice per audio sample :)

> 
> xperfmon++ has a tendency to not become adapted to more recent changes
> very quickly (guess whom you should blame for this :-).  systat
> -vmstat might be more authoritative in its data (and also gives you a
> split view for the various interrupt sources).

julian