Date: Mon, 30 Aug 2010 13:05:37 +0200 From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no> To: Ilya Bakulin <webmaster@kibab.com> Cc: geom@freebsd.org, hackers@freebsd.org Subject: Re: Support for WD Advanced Format disks Message-ID: <86bp8kjr7i.fsf@ds4.des.no> In-Reply-To: <20100828204415.6875b4ec@kibab.com> (Ilya Bakulin's message of "Sat, 28 Aug 2010 20:44:15 %2B0400") References: <86wrry1hwv.fsf@ds4.des.no> <20100828130912.48205a47@kibab.com> <20100828195024.3d671a76@kibab.com> <20100828204415.6875b4ec@kibab.com>
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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
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