From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 31 Jan 2001 20:53:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 31 Jan 2001 20:53:13 -0500 Received: from mail09.voicenet.com ([207.103.0.35]:44706 "HELO mail09.voicenet.com") by vger.kernel.org with SMTP id ; Wed, 31 Jan 2001 20:53:05 -0500 Message-ID: <3A78C17A.B06F74FC@voicenet.com> Date: Wed, 31 Jan 2001 20:52:58 -0500 From: safemode X-Mailer: Mozilla 4.76 [en] (X11; U; Linux 2.2.19pre7 i686) X-Accept-Language: en MIME-Version: 1.0 To: Byron Stanoszek CC: linux-kernel@vger.kernel.org Subject: Re: VT82C686A corruption with 2.4.x In-Reply-To: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Byron Stanoszek wrote: > On Wed, 31 Jan 2001, safemode wrote: > > > yea i know. . same mode i also had a big problem with DMA timeouts on > > 2.4 so .. i dont know what's up with 2.4 and my motherboard ... 2.2 > > hasn't shown a single irq or DMA error yet since going back to it. > > currently 2.2.19-pre7 is using UDMA4 i just flashed the bios today so .. > > hopefully that should have fixed any problems. I get 24MB/s each according > > to hdparm -t on my hdd's and both are on the same channel. This is much > > better than i ever got with 2.4 even when only one drive was on a channel. > > Right now my k7-2 750 is at 849mhz with a FSB of 114Mhz and PCI at 34Mhz. > > my nbench performance under 2.2 is comparable to results for 1Ghz t-bird's so > > i'm happy with 2.2. The only thing that would make me want to upgrade would > > be latency patches. I'm convinced 2.4 has performance issues so i guess i'll > > be using 2.2 until 2.5 begins. Is it really only 1 or 2 people having > > this Via corruption problem? i doubt it's a bios problem because wouldn't > > 2.2 be effected by a bios bug if 2.4 is? In either case the changelogs dont > > show any fixes for it. > > If your FSB is running at 114 MHz, you should try the kernel parameter > idebus=37 to get DMA working correctly. Otherwise you'll see an ide-reset error > on bootup because the instructions are too fast. The VIA driver on 2.2 doesn't > correctly program the PCI card, so you don't see weird behavior running 2.2 > with a faster PCI clock. > > (Note: 1.14 * 33 = 37.6 PCI Clk) > > It also matters what motherboard you're using, and if it can support speeds up > past 100. If you're serious about overclocking, buy one of the new KT133A > boards that support speeds up to 133 (or an average overclocked 145 limit). > > For instance, my Epox KX133 board is unstable at anything above 110 FSB, but > I've seen the Abit KT7 go as high as 116. You should also have some good > memory that is rated for 150MHz, otherwise you're just asking for trouble. My KA7 can go over 160Mhz FSB Yes i know about memory speed limitions ..that's why you are able to choose HW clock - PCI so at those high speeds it's actually say 120Mhz - 33 keeping you below or near 100 and not well over the spec of the ram. Anyway i dont go that high 110 is safe an doesn't cause any heat increase and gives me 100Mhz more. nbench shows my performance about equal to t-bird 1ghz. at least in memory and integer. The KA7 lets you increase the FSB without increasing the PCI bus speed, so i dont have to worry about changing ide bus timings, PCI is still at 33 - 34 not enough to hurt any cards. > > As always, if you have problems with the kernel and want to submit a bug > report, please put all the settings back to normal and test thoroughly before > continuing. It's funny how many bug reports I've heard from people who've > overclocked their FSB and expected the IDE DMA to be set appropriately under > 2.4... maybe this should be mentioned somewhere in ide.txt, even though > overclocking is frowned upon. As i mentioned in older emails, i did this _today_ i mentioned this "bug" over two weeks ago. I turned off DMA in the bios and kernel and the "bug" was still present. you can read the old emails and see for yourself. > > Regards, > Byron > > -- > Byron Stanoszek Ph: (330) 644-3059 > Systems Programmer Fax: (330) 644-8110 > Commercial Timesharing Inc. Email: bstanoszek@comtime.com OK ok.. just forget i ever mentioned it .. It has nothing to do with anything i've been talking about problem wise because i _JUST_ did it now ... It is the cause of nothing because they all happened before i did anything to the speed. This is a 2.4.x kernel problem. It has nothing to do with overclocking because at the time i didn't. When i used 2.2.x it did not have any problems and i did not overclock. As of now i have no problems with ide resets or dma timeouts (which is what i said before), regardless of if i'm overclocking it now or not. It's working great (better than great) without changing anyhing in 2.2.19-pre7. heh. so everyone can stop flipping out over overclocking because i made sure hardware settings were default failsafe even before deciding it was definitely a kernel problem and i never had the settings over spec before the problem surfaced. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/