Date: Fri, 17 Nov 2000 16:45:11 -0700 (MST) From: Nate Williams <nate@yogotech.com> To: Warner Losh <imp@village.org> Cc: Steve Price <sprice@hiwaay.net>, Mark.Andrews@nominum.com, stable@FreeBSD.ORG Subject: Re: 4.2-BETA hangs on boot Message-ID: <14869.49927.736257.730814@nomad.yogotech.com> In-Reply-To: <200011172237.PAA77876@harmony.village.org> References: <20001117162836.N62344@bonsai.knology.net> <20001116204344.B62344@bonsai.knology.net> <20001116195957.A62344@bonsai.knology.net> <200011170209.eAH297q51130@drugs.dv.isc.org> <200011172203.PAA77619@harmony.village.org> <200011172237.PAA77876@harmony.village.org>
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[ PCIC defaults to polling mode ] > There are six million brands of laptop in the world. To be honest, > this thread is basically the first one to say that there's something > wrong. PAO3 has done this for some time, if I understand thigns > correctly, and hasn't reported problems. FWIW, I switched *from* polling mode to IRQ mode in FreeBSD 2.2.X (can't remember) for two reasons: 1) suspend/resume works *much* more reliably. (However, I ended up rewriting the suspend/resume code anyway). 2) Too many folks complained that polling didn't work reliably. However, I believe the second was related to the fact that there were races in the polling code (which came from PAO), such that polling was *always* being done, regardless of whether or not the IRQ was being used. Finally, stating the 'PAO' has done it for some time is not (IMO) a great argument. In the past, PAO has done lots of things incorrectly, and that things worked at all was merely good luck. Polling 'should' work in all cases, although suspend/resume may not work reliably (races and such). If it doesn't work on Steve's laptop, something is messed up with the PCIC probing/setup, since it should work fine. The biggest advantage for supporting 'polling by default' is the fact that IRQ's are a precious commodity on newer hardware, and 'wasting' one just for insertion/removal events seems a waste. (Steve, on a whim, is PnP turned *OFF* in your BIOS?) Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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