Date: Mon, 29 Sep 2008 14:52:03 -0700 From: Marcel Moolenaar <xcllnt@mac.com> To: Nathan Whitehorn <nwhitehorn@freebsd.org> Cc: grehan@freebsd.org, freebsd-ppc@freebsd.org Subject: Re: Call for testers: Apple ATA DMA Message-ID: <0D5AE023-0D54-43BA-A325-0E1BEEC39D28@mac.com> In-Reply-To: <48DE7C93.5050506@freebsd.org> References: <48D389EE.9000207@FreeBSD.org> <645CD2B8-11A0-42E8-B5F9-C04DCF21F763@mac.com> <48D84C12.7070207@freebsd.org> <0DD89065-9CF3-45E4-89A0-70D6BBB9621D@mac.com> <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>
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On Sep 27, 2008, at 11:33 AM, 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... Good and bad news. The good: my Xserve is working fine and acd0 is now using UDMA33 instead of BIOSPIO. The bad: my Mac Mini G4 is still having the same problems. This is ad0 at UDMA66 and acd0 at UDMA33. I'll experiment with it a bit later... -- Marcel Moolenaar xcllnt@mac.com
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