Date: Sat, 28 Aug 2010 13:05:49 -0300 From: Thiago Damas <tdamas@gmail.com> To: Ilya Bakulin <webmaster@kibab.com> Cc: =?ISO-8859-1?Q?Dag=2DErling_Sm=F8rgrav?= <des@des.no>, hackers@freebsd.org, geom@freebsd.org Subject: Re: Support for WD Advanced Format disks Message-ID: <AANLkTikwgiw7r1KFdMVYaoomMGmvpjw=2rGtqM%2BZ3at2@mail.gmail.com> In-Reply-To: <20100828195024.3d671a76@kibab.com> References: <86wrry1hwv.fsf@ds4.des.no> <20100828130912.48205a47@kibab.com> <20100828195024.3d671a76@kibab.com>
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You read: "ATA 4K sector issues" http://lists.freebsd.org/pipermail/freebsd-hackers/2010-March/031154.html 2010/8/28 Ilya Bakulin <webmaster@kibab.com>: > On Sat, 28 Aug 2010 13:09:12 +0400 > Ilya Bakulin <webmaster@kibab.com> wrote: > >> Right now I'm running phybs -w /dev/ad7p1 > > Well, phybs finished. > Results: > kibab-desktop# ./phybs -w /dev/ad7p1 > =A0 count =A0 =A0size =A0offset =A0 =A0step =A0 =A0 =A0 =A0msec =A0 =A0 t= ps =A0 =A0kBps > > =A0131072 =A0 =A01024 =A0 =A0 =A0 0 =A0 =A04096 =A0 =A0 3098125 =A0 =A0 = =A0 0 =A0 =A0 =A042 > =A0131072 =A0 =A01024 =A0 =A0 512 =A0 =A04096 =A0 =A0 3100047 =A0 =A0 =A0= 0 =A0 =A0 =A042 > > =A0 65536 =A0 =A02048 =A0 =A0 =A0 0 =A0 =A08192 =A0 =A0 1505809 =A0 =A0 = =A0 0 =A0 =A0 =A087 > =A0 65536 =A0 =A02048 =A0 =A0 512 =A0 =A08192 =A0 =A0 1505179 =A0 =A0 =A0= 0 =A0 =A0 =A087 > =A0 65536 =A0 =A02048 =A0 =A01024 =A0 =A08192 =A0 =A0 1506127 =A0 =A0 =A0= 0 =A0 =A0 =A087 > > =A0 32768 =A0 =A04096 =A0 =A0 =A0 0 =A0 16384 =A0 =A0 1522343 =A0 =A0 =A0= 1 =A0 =A0 =A086 > =A0 32768 =A0 =A04096 =A0 =A0 512 =A0 16384 =A0 =A0 1521017 =A0 =A0 =A0 1= =A0 =A0 =A086 > =A0 32768 =A0 =A04096 =A0 =A01024 =A0 16384 =A0 =A0 1523748 =A0 =A0 =A0 1= =A0 =A0 =A086 > =A0 32768 =A0 =A04096 =A0 =A02048 =A0 16384 =A0 =A0 1522853 =A0 =A0 =A0 1= =A0 =A0 =A086 > > =A0 16384 =A0 =A08192 =A0 =A0 =A0 0 =A0 32768 =A0 =A0 =A0890911 =A0 =A0 = =A0 3 =A0 =A0 147 > =A0 16384 =A0 =A08192 =A0 =A0 512 =A0 32768 =A0 =A0 =A0892026 =A0 =A0 =A0= 3 =A0 =A0 146 > =A0 16384 =A0 =A08192 =A0 =A01024 =A0 32768 =A0 =A0 =A0890699 =A0 =A0 =A0= 3 =A0 =A0 147 > =A0 16384 =A0 =A08192 =A0 =A02048 =A0 32768 =A0 =A0 =A0891862 =A0 =A0 =A0= 3 =A0 =A0 146 > =A0 16384 =A0 =A08192 =A0 =A04096 =A0 32768 =A0 =A0 =A0889903 =A0 =A0 =A0= 3 =A0 =A0 147 > > Obviously 34-sectors offset is bad for phybs. Write requests are NEVER ge= t aligned. > I have recreated partition as follows: > > kibab-desktop# gpart delete -i 1 ad7 > ad7p1 deleted > kibab-desktop# gpart add -t freebsd-ufs -s 10G -b 63 ad7 > ad7p1 added > kibab-desktop# gpart show ad7 > =3D> =A0 =A0 =A0 =A034 =A02930277101 =A0ad7 =A0GPT =A0(1.4T) > =A0 =A0 =A0 =A0 =A034 =A0 =A0 =A0 =A0 =A029 =A0 =A0 =A0 - free - =A0(15K) > =A0 =A0 =A0 =A0 =A063 =A0 =A020971520 =A0 =A01 =A0freebsd-ufs =A0(10G) > =A0 =A020971583 =A02909305552 =A0 =A0 =A0 - free - =A0(1.4T) > > So, we have ad7p1 which is still misaligned, but if write request will st= art at offset=3D512, it will be aligned properly. > Let's test as follows: > > kibab-desktop# ./phybs -l 4096 -w /dev/ad7p1 > =A0 count =A0 =A0size =A0offset =A0 =A0step =A0 =A0 =A0 =A0msec =A0 =A0 t= ps =A0 =A0kBps > > =A0 32768 =A0 =A04096 =A0 =A0 =A0 0 =A0 16384 =A0 =A0 1520609 =A0 =A0 =A0= 1 =A0 =A0 =A086 > =A0 32768 =A0 =A04096 =A0 =A0 512 =A0 16384 =A0 =A0 =A0 17898 =A0 =A0 151= =A0 =A07323 > =A0 32768 =A0 =A04096 =A0 =A01024 =A0 16384 =A0 =A0 1524899 =A0 =A0 =A0 1= =A0 =A0 =A085 > > :-) Aligned writes are 86 times faster than misaligned!!! > -- > Regards, > Ilya Bakulin > http://kibab.com > xmpp://kibab612@jabber.ru >
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