From owner-freebsd-hackers Wed Jan 29 13:20:59 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.5/8.8.5) id NAA22121 for hackers-outgoing; Wed, 29 Jan 1997 13:20:59 -0800 (PST) Received: from sax.sax.de (sax.sax.de [193.175.26.33]) by freefall.freebsd.org (8.8.5/8.8.5) with SMTP id NAA22111 for ; Wed, 29 Jan 1997 13:20:53 -0800 (PST) Received: (from uucp@localhost) by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id WAA04513; Wed, 29 Jan 1997 22:20:44 +0100 Received: (from j@localhost) by uriah.heep.sax.de (8.8.4/8.6.9) id WAA21423; Wed, 29 Jan 1997 22:03:51 +0100 (MET) Message-ID: 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... References: X-Mailer: Mutt 0.55-PL10 Mime-Version: 1.0 X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) In-Reply-To: ; from Simon Shapiro on Jan 29, 1997 11:13:14 -0800 Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk 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. ;-)