Date: Wed, 26 Nov 1997 13:36:02 +0100 From: tg@award.de To: sos@FreeBSD.dk Cc: hackers@freebsd.org Subject: Re: PIIX configuration Message-ID: <19971126133602.62657@mail.award.de> In-Reply-To: =?iso-8859-1?Q?=3C199711261031=2ELAA05158=40sos=2Efreebsd=2Edk=3E=3B_fro?= =?iso-8859-1?Q?m_S=F8ren_Schmidt_on_Wed=2C_Nov_26=2C_1997_at_11=3A31=3A1?= =?iso-8859-1?Q?3AM_%2B0100?= References: <19971126100027.53229@mail.award.de> <199711261031.LAA05158@sos.freebsd.dk>
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On Wed, Nov 26, 1997 at 11:31:13AM +0100, Søren Schmidt wrote: > In reply to tg@award.de who wrote: > > Hello all, > > while looking through the source in /sys/pci yesterday, I noticed that the > > detection code for the Intel 82371xx IDE chip (PIIX) was present in 2 places. > > > > The detection code in pcisupport.c will find the chip first, claim it and > > display that it found one, but will not do anything with the chip. > > > > This effectively blocks the detection code in wd82371.c, which means that the > > more sophisticated code there does not get executed at all, so no DMA setup. > > Quite a pity if your IDE disk supports DMA. > > You must be looking at a 2.2.x system. > For more up to date (E)IDE driver system look in curent, there is > suppport for DMA etc modes. Err... Sh*t. That's why I always ask MY customers which version they are using. The system in question is a 2.2.5-Stable cvsupped 11/17. Sorry. Is there any chance to take the code from current and mix it into 2,2,x without too much work ? > Most of the speed difference comes from the fact that linux has delayed > write on as default, try mounting your disks with the async flag, and > you will see semilar performance (and less security against corrupted > disks on power outages etc). I don't think that the major speed difference comes from the sync vs. async mounting. The speed difference was measured using bonnie with files > 100M and that's about twice the available RAM. Besides, I usually mount anything sync if possible. Old electrical installation, you know :-). Regards, Timo
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