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From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: Ilya Bakulin <webmaster@kibab.com>
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Date: Mon, 30 Aug 2010 13:05:37 +0200
In-Reply-To: <20100828204415.6875b4ec@kibab.com> (Ilya Bakulin's message of
	"Sat, 28 Aug 2010 20:44:15 +0400")
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Cc: geom@freebsd.org, hackers@freebsd.org
Subject: Re: Support for WD Advanced Format disks
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Ilya Bakulin <webmaster@kibab.com> writes:
> So, ad7p1.nop is shifted by 512 bytes and resides right on the
> beginning of the physical sector. And it has 4096 "sector" size.

Why did you shift the gnop?  Did you short jumper 7-8?

> For some reason, phybs begins with sector size 8192... I expected it
> to begin with 4096...

It starts at 2 x reported sector size, because it is designed primarily
to test alignment, not performance.

> Perfomance is excellent!

No, performance blows.  See here:

http://maycontaintracesofbolts.blogspot.com/2010/08/benchmarking-advanced-f=
ormat-drives.html

> Notice, that for two subsequent phybs invocations there is big
> difference in timings for the same parameters.

Yes.  WD Green disks suck.

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no