>Number: 161720
>Category: misc
>Synopsis: bsdinstall: partition editor does not put partitions on even
>4K boundaries
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Oct 16 18:00:28 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator: Warren Block
>Release: 9.0-BETA3
>Organization:
>Environment:
FreeBSD machine3.example.com 9.0-BETA3 FreeBSD 9.0-BETA3 #0: Sat Sep 24
21:31:28 UTC 2011 [email protected]:/usr/obj/usr/src/sys/GENERIC
amd64
>Description:
Partitions created by the Auto option of bsdinstall's partition editor do not
start on even 4K boundaries. This will seriously compromise performance on
drives with 4K-byte blocks.
gpart show ada0
=> 34 25694141 ada0 GPT (12G)
34 128 1 freebsd-boot (64k)
162 23068544 2 freebsd-ufs (11G)
23068706 1284096 3 freebsd-swap (627M)
24352802 1341373 - free - (655M)
Partition 2 starts at block 162. Instead, it should start at 1M as with
gpart add -t freebsd-ufs -b 1M -s 11G ada0
Note: at present, FreeBSD boot code fails when freebsd-boot partitions are
larger than 512K, so making the freebsd-boot partition 1M is not the simple fix
it appears to be.
Reported by je33 in http://forums.freebsd.org/showthread.php?t=27044
>How-To-Repeat:
Install FreeBSD 9.0-BETA3 with bsdinstall and Auto partitioning.
>Fix:
FreeBSD partition types other than freebsd-boot should start at the next even
multiple of 1M for good performance on Advanced Format (4K block) drives
without harming performance of 512 byte drives.
>Release-Note:
>Audit-Trail:
>Unformatted:
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