[Bug 576601] Re: [MacBookPro 7, 1]mcp89 sata link reset fails, no disks detected

[James Cameron]

@Payall: on Mac mini 2010 with internal 320Gb SATA drive, performance is
low, about a tenth of expected.  About 7 MB/sec on Ubuntu 10.04 using
the above kernel, versus about 55 MB/sec on Mac OS X as shipped.  Better
than the 0 MB/sec before this fix was available.

(Test method on Ubuntu; ensure system is quiescent, "apt-get install pv"
then "pv /dev/sda > /dev/null" and read the display.  Test method on Mac
OS X; create a large file, reboot, "time cat file > /dev/null", note the
file size and the duration, divide out the result.)

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[MacBookPro 7,1]mcp89 sata link reset fails, no disks detected
https://bugs.launchpad.net/bugs/576601
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