Date: Sun, 28 Sep 2008 01:45:49 +0200 From: Marius Strobl <marius@alchemy.franken.de> To: Nathan Whitehorn <nwhitehorn@freebsd.org> Cc: grehan@freebsd.org, freebsd-ppc@freebsd.org Subject: Re: Call for testers: Apple ATA DMA Message-ID: <20080927234549.GA16124@alchemy.franken.de> In-Reply-To: <48DE7C93.5050506@freebsd.org> References: <48D92D44.6080807@freebsd.org> <b9c23c9f0809240338g61e93beoba429ea319a9d56@mail.gmail.com> <48DA4037.9000508@freebsd.org> <b9c23c9f0809240632h77f091dawe54887d0a7f51c1d@mail.gmail.com> <48DBD6C0.5070005@freebsd.org> <b9c23c9f0809261048v366a3cc9i4db8a16cd4eda03@mail.gmail.com> <b9c23c9f0809261053j121ce31fpb62382ff30e6ef76@mail.gmail.com> <48DD2DF7.2020901@freebsd.org> <48DDAC14.9070604@freebsd.org> <48DE7C93.5050506@freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sat, Sep 27, 2008 at 01:33:55PM -0500, Nathan Whitehorn wrote: > Peter Grehan wrote: > >Hi Nathan, > > > > > If I can get positive reports from a few more people who were > >>having trouble, I'll drop this in the tree. > > > > The imac's ata-4 is working solidly at UDMA-66. The difference in CPU > >usage and i/o with dd at 32k block size is stunning: 2MB/7% idle before, > >18MB/75% idle with your patch. > > I guess DMA is a useful technology :) > > Thanks for testing -- I've committed the patch. I'll revisit it when > Marcel tests it on Monday and it erases his hard drive... I see two issues with acd(4) on sparc64, which, given that I don't see them with either amd64 or i386 and that there are no such reports for these archs, I suspect are endian- bugs (which might be hidden with 32-bit machines though): a) read-only drives are falsely reported as having write capabilities in dmesg (this is a rather old bug but so far this seemed to be a cosmetic problem only) b) DMA is broken in that file content read is wrong except for "small" files; there's no data corruption when PIO mode is forced (this seem to be a recurring bug once again present in HEAD). Do you guys see these problems also with powerpc? Marius
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20080927234549.GA16124>