Date: Sun, 25 Jul 2010 00:37:27 -0500 From: Adam Vande More <amvandemore@gmail.com> To: Dan Langille <dan@langille.org> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: gpart -b 34 versus gpart -b 1024 Message-ID: <AANLkTinKEBb5S9REK3nn8GF3U=jRAtYMBBfsC5TB8Xj4@mail.gmail.com> In-Reply-To: <4C4BB672.3090109@langille.org> References: <4C4BA50B.6050507@langille.org> <4C4BB672.3090109@langille.org>
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On Sat, Jul 24, 2010 at 10:58 PM, Dan Langille <dan@langille.org> wrote: > -------Sequential Output-------- ---Sequential Input-- --Random-- > -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- > GB M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU /sec %CPU > 50 110.5 81.0 112.8 15.0 62.8 9.0 72.9 48.5 139.7 9.5 144 0.9 > > Here, the results aren't much better either... am I not aligning this > partition correctly? Missing something else? Or... are they both 4K block > aligned? The alignment doesn't apply to all drives, just the 4k WD's and some ssd's. If they were misaligned, you would see a large difference in the tests. A few points one way or other in these is largely meaningless. That being said, if I were you I would set -b 2048(1 MB) as the default, the amount of space wasted is trivial and your partition will always be aligned. People following your tutorials may have a variety of different drives and that setting is safe for all. Windows defaults to this offset for the same reason: DISKPART> list partition Partition ### Type Size Offset ------------- ---------------- ------- ------- Partition 1 Primary 1116 GB 1024 KB -- Adam Vande More
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