From owner-freebsd-hackers Mon Oct 27 19:25:47 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id TAA20024 for hackers-outgoing; Mon, 27 Oct 1997 19:25:47 -0800 (PST) (envelope-from owner-freebsd-hackers) Received: from server.local.sunyit.edu (A-T34.rh.sunyit.edu [150.156.210.241]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id TAA19978 for ; Mon, 27 Oct 1997 19:25:38 -0800 (PST) (envelope-from perlsta@cs.sunyit.edu) Received: from localhost (perlsta@localhost) by server.local.sunyit.edu (8.8.7/8.8.5) with SMTP id XAA01904; Mon, 27 Oct 1997 23:30:35 -0500 (EST) X-Authentication-Warning: server.local.sunyit.edu: perlsta owned process doing -bs Date: Mon, 27 Oct 1997 23:30:35 -0500 (EST) From: Alfred Perlstein X-Sender: perlsta@server.local.sunyit.edu To: Thomas David Rivers cc: freebsd-hackers@freefall.FreeBSD.org Subject: Re: sio silo overflows on a P75 @ 38400 baud? In-Reply-To: <199710280247.VAA05306@lakes.dignus.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk you are quite possbily over loading your system with a combination of writes and swapping (8megs of ram? ewwww) if disk activity is constant it's quite possible to reach a load of 9.0+ i did while doing a buildworld and making my kernel -j8... it was at like 9.6+ at times... pretty cool as X kept freezing for several seconds at a time... On Mon, 27 Oct 1997, Thomas David Rivers wrote: > > I was just wondering - should it be possible, at 38400 baud, > in multi-user mode, but nothing else really going on; to get > silo overflows on a P75 with 16550 (clone?) UARTs? > > I'm doing a SL/IP connection and sending the output of > dd'ing a tape back to the P75 system for un-tarring. The > sending system is a P200 (running FreeBSD 2.2-970510.) > > I'm getting these silo overflows with 2.2.5. > > I'm hoping someone can whip out some figures on the > interrupt latency to suggest that a P75 should be able > to deal with receiving 38400... > > This could, of course, be an artifact of some device > holding the bus too long. The P75 machine is a laptop > with a IDE drive (to which I'm writting) and 8 meg of memory; > again, running 2.2.5-RELEASE. > > - Thanks - > - Dave Rivers - >