Date: Wed, 5 Oct 2005 10:18:41 +0200 From: Jeremie Le Hen <jeremie@le-hen.org> To: Andrzej Tobola <ato@iem.pw.edu.pl>, Pertti Kosunen <pertti.kosunen@pp.nic.fi> Cc: freebsd-current@FreeBSD.org, Jeremie Le Hen <jeremie@le-hen.org> Subject: Re: ATA/DMA problem after reboot Message-ID: <20051005081840.GK43195@obiwan.tataz.chchile.org> In-Reply-To: <20050929170359.GA31360@amper.iem.pw.edu.pl> References: <20050928190336.GA1027@obiwan.tataz.chchile.org> <200509281527.33584.mistry.7@osu.edu> <20050928202406.GD1027@obiwan.tataz.chchile.org> <20050928222849.GA1086@obiwan.tataz.chchile.org> <20050929170359.GA31360@amper.iem.pw.edu.pl>
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Hi Andrzej, Pertti, > > I tried to disable APIC, S.M.A.R.T, IDE DMA Burst, IDE Block Mode. > > I don't know what the last one does, but anyway, nothing corrected > > my problem. > > > > Other suggestions are welcome. > > In my case switching from UDMA33 to WDMA solves the problem, > but almost halves disk bandwidth (from 28M/s to 18M/s) > (via # atacontrol mode ad0) > > It seems that there is som nasty timing bug in ATA or system > so only big bulk transfer are affected How do I set this at boot time ? There may be a tunable or something allowing to do this. My problem indeed occurs before / is even mounted. Regards, -- Jeremie Le Hen < jeremie at le-hen dot org >< ttz at chchile dot org >
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