From owner-freebsd-hackers Sun Dec 8 20:05:45 1996 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.4/8.8.4) id UAA21869 for hackers-outgoing; Sun, 8 Dec 1996 20:05:45 -0800 (PST) Received: from pdx1.world.net (pdx1.world.net [192.243.32.18]) by freefall.freebsd.org (8.8.4/8.8.4) with ESMTP id UAA21852 for ; Sun, 8 Dec 1996 20:05:42 -0800 (PST) From: proff@suburbia.net Received: from suburbia.net (suburbia.net [203.4.184.1]) by pdx1.world.net (8.7.5/8.7.3) with SMTP id UAA28225 for ; Sun, 8 Dec 1996 20:06:00 -0800 (PST) Received: (qmail 4549 invoked by uid 110); 9 Dec 1996 04:05:15 -0000 Message-ID: <19961209040514.4547.qmail@suburbia.net> Subject: Re: strange problems with recent current In-Reply-To: <199612090319.OAA12973@godzilla.zeta.org.au> from Bruce Evans at "Dec 9, 96 02:19:33 pm" To: bde@zeta.org.au (Bruce Evans) Date: Mon, 9 Dec 1996 15:05:14 +1100 (EST) Cc: hackers@freebsd.org X-Mailer: ELM [version 2.4ME+ PL28 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk > >Dec 8 02:37:59 evil /kernel: cy15: 5 more silo overflows (total 3876) > >Dec 8 02:38:00 evil /kernel: cy8: 1 more silo overflow (total 7) > >... > >This has crept in sometime during the past few days. > > On what hardware? The PCI cy driver doesn't use a "fast" interrupt > handler yet, so silo overflows are quite likely for it. E.g., updating > the keyboard LEDs takes a few msec, so a few fifos full of input may > be dropped on each port whenever you hit caps lock (the fifo fills up > in 1 msec at 115200 bps). P100/Triton mother board. 4 Triton/mb IDE drives, two scsi (ISA adaptec), average 120 procs, 72Mb swap used (striped over the 4 ide drives). This configuration hasn't changed, and I don't use the console keyboard, infact..the console keyboard has been unplugged (could this have any effect?) > >Previously cy.c > >would suffer silo overflows far more rarely (once every 10-30 seconds > >on average) and overflows quantities were never over 2 or 3. > > One per day is too many. cy15 is often going at 57.6k in both directions, the others are more sporadic typical dial-up-user traffic (at 38.4). I moved cy15 onto sio1 (on board 16550A uart) Dec 9 14:58:16 suburbia /kernel: sio1: 1 more silo overflow (total 17190) Dec 9 14:58:21 suburbia /kernel: cy0: 2 more silo overflows (total 220) Dec 9 14:58:21 suburbia /kernel: sio1: 1 more silo overflow (total 17191) Dec 9 14:58:29 suburbia /kernel: sio1: 1 more silo overflow (total 17192) Dec 9 14:58:38 suburbia /kernel: sio1: 1 more silo overflow (total 17193) (uptime 16 hours) This is actually quite a bit better than the cyclades (could just be the 12 vs 15 byte byffer) but still worse than the cyclades before the "slow down". > >Response time generally has suffered, even with a very low load. Feels > >like some kind of excessive context switching delay. > > I haven't noticed any new problems here on a lightly loaded 486/33 system. > > Bruce > Load average is typically around 0.16 Cheers, Julian.