Date: Mon, 25 Jul 2011 21:32:25 -0700 From: perryh@pluto.rain.com To: ml@netfence.it Cc: freebsd-questions@freebsd.org Subject: Re: ATA troubles Message-ID: <4e2e4359.Bqcxgx6o90aaXsM4%perryh@pluto.rain.com> In-Reply-To: <4E2D6BD7.4030500@netfence.it> References: <4E2CB198.9010601@netfence.it> <4E2CBCAB.1070209@dichotomia.fr> <4e2d77ab.MMEk62U6kU%2BdlZeX%perryh@pluto.rain.com> <4E2D6BD7.4030500@netfence.it>
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Andrea Venturoli <ml@netfence.it> wrote:
> On 07/25/11 16:03, perryh@pluto.rain.com wrote:
> > I fixed a similar problem -- involving a VIA 6421 controller --
> > a while back, by using atacontrol(8) to reduce the DMA speed
> > from UDMA133 to UDMA100.
> ...
> I don't know if this is really effective with SATA...
Nor do I; my problem involved a PATA device.
Dmesg reports for SATA devices include a UDMAxx notation in addition
to the SATA speed notation, but I don't know its significance.
ad0: 305245MB <Hitachi HDT725032VLAT80 V54OA4NA> at ata0-master
UDMA66
ad1: 32253MB <MAXTOR 6L040L2 A93.0500> at ata0-slave UDMA66
ad4: 61136MB <PATRIOT MEMORY 64GB SSD 02.10104> at ata2-master
UDMA100 SATA 1.5Gb/s
acd1: DVDR <PIONEER DVD-RW DVR-212D/1.24> at ata3-master
UDMA66 SATA 1.5Gb/s
ad8: 305245MB <Hitachi HDT725032VLAT80 V54OA4NA> at ata4-master
UDMA133
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