Date: Wed, 29 Jan 1997 22:03:50 +0100 From: j@uriah.heep.sax.de (J Wunsch) To: Shimon@i-Connect.Net (Simon Shapiro) Cc: hackers@FreeBSD.ORG Subject: Re: More 2.2-BETA goodies... Message-ID: <Mutt.19970129220350.j@uriah.heep.sax.de> In-Reply-To: <XFMail.970129120959.Shimon@i-Connect.Net>; from Simon Shapiro on Jan 29, 1997 11:13:14 -0800 References: <XFMail.970129120959.Shimon@i-Connect.Net>
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As Simon Shapiro wrote: > 1. An easy way to panic the system: > > * Put ``devfs /devs devfs rw 0 0'' > in /etc/fstab > * Do ``mount -a'' Shortcut: umount /devs Known sucker. DEVFS is really not yet ready for the masses. (Alas.) > 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. 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). -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)
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