Date: Tue, 19 Dec 2000 15:19:22 -0700 From: Chris Wasser <cwasser@v-wave.com> To: freebsd-stable@FreeBSD.ORG Subject: Re: DMA33 ATAPI CDROM and 4.2-STABLE Message-ID: <20001219151922.A73910@skunkworks.area51-arpa.mil> In-Reply-To: <20001218155755.A16179@Odin.AC.HMC.Edu>; from brooks@one-eyed-alien.net on Mon, Dec 18, 2000 at 03:57:55PM -0800 References: <015d01c0694b$c34952c0$931576d8@inethouston.net> <20001218154939.A15680@Odin.AC.HMC.Edu> <01a501c0694d$c0865040$931576d8@inethouston.net> <20001218155755.A16179@Odin.AC.HMC.Edu>
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On Mon 18 Dec 2000, Brooks Davis wrote: > That was a rather important piece of missing information. If this > worked before then you've got a bug and should file a PR, if not, you > probably don't. At this point if it never worked in DMA mode before, > then your CDROM most likely doesn't have DMA support. It is slowing > down your HD though how much I don't know since I know sos committed > code at some point that sped it up quite a bit. There are a number of > reasons why that master-slave crap is gone from Serial-ATA. (this isn't to you Brooks, but the person you replied to) Actually I ran into this "problem" not too long ago when I swapped my ASUS 40x UDMA2 cdrom from my Intel BX controller to a HPT366, the HPT366 BIOS detects it as UDMA2 as does the Intel controller but the drive only runs UDMA2 when on the Intel controller under BSD. I talked to Soren about this and he made it pretty clear this is (I also had ATA_ENABLE_ATAPI_DMA enabled in my kernel as well) not all that big a deal. I can't see it making all that big a difference unless perhaps your machine is a network jukebox or something where CDROM speed would be a important factor, but if you're like me and rarely use your CDROM under BSD (I use it more in Windows then BSD) then you're missing nothing. (I myself was more concerned that the drive was being setup incorrectly rather then not running at full speed, which isn't the case) - Chris To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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