Date: Wed, 20 Oct 2004 09:26:23 -0600 From: Nathan Kinkade <nkinkade@ub.edu.bz> To: Mark Cullen <mark.cullen@dsl.pipex.com> Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Re: WDMA mode won't enable? Old machine... Message-ID: <20041020152623.GK3633@gentoo-npk.bmp.ub> In-Reply-To: <4175849A.5080606@dsl.pipex.com> References: <4175849A.5080606@dsl.pipex.com>
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[-- Attachment #1 --] On Tue, Oct 19, 2004 at 10:18:18PM +0100, Mark Cullen wrote: > I have a rather old machine acting as a home server. According to dmesg > it has a: > > -- > atapci0: <Intel PIIX WDMA2 controller> port > 0xffa0-0xffaf,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 7.1 on pci0 > -- > > However, both hard disks attached are running in PIO mode. > > -- > ad0: 4103MB <ST34321A> [8894/15/63] at ata0-master BIOSPIO > ad2: 6194MB <IBM-DADA-26480> [13424/15/63] at ata1-master BIOSPIO > -- > > I tried running the following, but as you can see the end result is that > they are still running BIOSPIO. > > -- > (root|bone)/home/mrboo# atacontrol mode 0 WDMA2 WDMA2 > Master = BIOSPIO > Slave = BIOSPIO > -- > > Any suggestions as to how I might enable some sort of DMA on these > drives? Since the machine is rather slow (133MHz) and it's currently > using polled IO I am sure it will likely benefit me, even if it isn't > quite UDMA :) You should check out the following sysctl variables: hw.ata.ata_dma hw.ata.atapi_dma These are readonly at runtime, so need to be set at boot in the file /boot/loader.conf. You can add the them like so: hw.ata.ata_dma=1 hw.ata.atapi_dma=1 Also, as I understand it, 80 conductor ribbon cables were only recommended at UDMA modes <=2, but perhaps you might consider using one just to be safe. Nathan -- PGP Public Key: pgp.mit.edu:11371/pks/lookup?op=get&search=0xD8527E49 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iD8DBQFBdoOfO0ZIEthSfkkRAqiFAJ4xwoMh+8C+n+b3bAjRHVQT0CPymgCfTNme Uy23EAhFUEiJoJff/xbX5HY= =wfsS -----END PGP SIGNATURE-----
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