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Brian Behlendorf 395350c85d Improve AF hard disk detection 
Use the bdev_physical_block_size() interface to determine the
minimize write size which can be issued without incurring a
read-modify-write operation.  This is used to set the ashift
correctly to prevent a performance penalty when using AF hard
disks.

Unfortunately, this interface isn't entirely reliable because
it's not uncommon for disks to misreport this value.  For this
reason you may still need to manually set your ashift with:

  zpool create -o ashift=12 ...

The solution to this in the upstream Illumos source was to add
a while list of known offending drives.  Maintaining such a list
will be a burden, but it still may be worth doing if we can
detect a large number of these drives.  This should be considered
as future work.

Reported-by: Richard Yao <ryao@cs.stonybrook.edu>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #916
2012-09-04 15:35:32 -07:00
..
.gitignore Remove autotools products 2012-08-27 11:47:44 -07:00
always-no-unused-but-set-variable.m4 In autoconf v2.68, AC_LANG_PROGRAM must be quoted 2011-11-28 11:16:33 -08:00
arch.am Don't build packages that haven't been selected. 2012-07-26 13:39:37 -07:00
config.awk Add build system 2010-08-31 13:41:27 -07:00
deb.am Don't build packages that haven't been selected. 2012-07-26 13:39:37 -07:00
kernel-automount.m4 Fix snapshot automounting with GrSecurity constify plugin. 2012-08-24 08:56:38 -07:00
kernel-bdev-block-device-operations.m4 Fix configure tests to play nice with GCC 4.6 2011-11-29 16:14:25 -08:00
kernel-bdev-logical-size.m4 Fix configure tests to play nice with GCC 4.6 2011-11-29 16:14:25 -08:00
kernel-bdev-physical-size.m4 Improve AF hard disk detection 2012-09-04 15:35:32 -07:00
kernel-bdi-setup-and-register.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-bdi.m4 Add backing_device_info per-filesystem 2011-08-04 13:37:38 -07:00
kernel-bio-empty-barrier.m4 Add build system 2010-08-31 13:41:27 -07:00
kernel-bio-end-io-t-args.m4 Fix gcc configure warnings 2011-04-19 10:10:47 -07:00
kernel-bio-failfast.m4 Fix gcc configure warnings 2011-04-19 10:10:47 -07:00
kernel-bio-rw-syncio.m4 Fix gcc configure warnings 2011-04-19 10:10:47 -07:00
kernel-blk-end-request.m4 Fix configure tests to play nice with GCC 4.6 2011-11-29 16:14:25 -08:00
kernel-blk-fetch-request.m4 Fix configure tests to play nice with GCC 4.6 2011-11-29 16:14:25 -08:00
kernel-blk-queue-discard.m4 Add support for DISCARD to ZVOLs. 2012-02-09 16:19:38 -08:00
kernel-blk-queue-flush.m4 Fix synchronicity for ZVOLs. 2012-02-07 16:23:06 -08:00
kernel-blk-queue-io-opt.m4 Improve ZVOL queue behavior. 2012-02-07 16:23:06 -08:00
kernel-blk-queue-max-hw-sectors.m4 Improve ZVOL queue behavior. 2012-02-07 16:23:06 -08:00
kernel-blk-queue-max-segments.m4 Improve ZVOL queue behavior. 2012-02-07 16:23:06 -08:00
kernel-blk-queue-nonrot.m4 Improve ZVOL queue behavior. 2012-02-07 16:23:06 -08:00
kernel-blk-queue-physical-block-size.m4 Improve ZVOL queue behavior. 2012-02-07 16:23:06 -08:00
kernel-blk-requeue-request.m4 Fix configure tests to play nice with GCC 4.6 2011-11-29 16:14:25 -08:00
kernel-blk-rq-bytes.m4 Fix configure tests to play nice with GCC 4.6 2011-11-29 16:14:25 -08:00
kernel-blk-rq-pos.m4 Fix configure tests to play nice with GCC 4.6 2011-11-29 16:14:25 -08:00
kernel-blk-rq-sectors.m4 Fix configure tests to play nice with GCC 4.6 2011-11-29 16:14:25 -08:00
kernel-blkdev-get-by-path.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-blkdev-get.m4 Move partition scanning from userspace to module. 2012-07-17 09:17:31 -07:00
kernel-check-disk-size-change.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-clear-inode.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-create-umode-t.m4 Linux 3.3 compat, iops->create()/mkdir()/mknod() 2012-04-30 12:52:38 -07:00
kernel-d-make-root.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-d-obtain-alias.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-discard-granularity.m4 Set zvol discard_granularity to the volblocksize. 2012-08-07 14:55:31 -07:00
kernel-encode-fh-inode.m4 Linux 3.5 compat, eops->encode_fh() takes inodes 2012-07-23 12:29:23 -07:00
kernel-evict-inode.m4 Fix build failures on PaX/GRSecurity patched kernels 2012-07-17 09:22:43 -07:00
kernel-fallocate.m4 Fix build failures on PaX/GRSecurity patched kernels 2012-07-17 09:22:43 -07:00
kernel-fmode-t.m4 Fix gcc configure warnings 2011-04-19 10:10:47 -07:00
kernel-fsync.m4 Fix build failures on PaX/GRSecurity patched kernels 2012-07-17 09:22:43 -07:00
kernel-get-disk-ro.m4 Fix configure tests to play nice with GCC 4.6 2011-11-29 16:14:25 -08:00
kernel-get-gendisk.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-insert-inode-locked.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-invalidate-bdev-args.m4 Fix gcc configure warnings 2011-04-19 10:10:47 -07:00
kernel-kobj-name-len.m4 Fix gcc configure warnings 2011-04-19 10:10:47 -07:00
kernel-mount-nodev.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-open-bdev-exclusive.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-rq-for-each_segment.m4 Fix configure tests to play nice with GCC 4.6 2011-11-29 16:14:25 -08:00
kernel-rq-is_sync.m4 Fix configure tests to play nice with GCC 4.6 2011-11-29 16:14:25 -08:00
kernel-security-inode-init.m4 Linux 3.2 compat, security_inode_init_security() 2012-01-12 15:06:39 -08:00
kernel-set-nlink.m4 Linux 3.2 compat: set_nlink() 2011-12-16 20:02:52 -08:00
kernel-show-options.m4 Fix NULL pointer dereference on PaX/GRSecurity patched Linux 3.3 and later kernels 2012-07-20 12:31:45 -07:00
kernel-shrink.m4 Linux 3.1 compat, super_block->s_shrink 2012-01-11 11:46:02 -08:00
kernel-truncate-range.m4 Linux 3.5 compat, iops->truncate_range() removed 2012-07-23 12:29:32 -07:00
kernel-truncate-setsize.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-xattr-handler.m4 Fix gcc configure warnings 2011-04-19 10:10:47 -07:00
kernel.m4 Improve AF hard disk detection 2012-09-04 15:35:32 -07:00
rpm.am Support building a zfs-modules-dkms sub package 2012-08-08 15:21:01 -07:00
Rules.am Check for -Wno-unused-but-set-variable gcc support 2011-06-14 14:43:22 -07:00
suppressed-warnings.txt Suppress packaging warning 2011-11-08 11:32:04 -08:00
tgz.am Don't build packages that haven't been selected. 2012-07-26 13:39:37 -07:00
user-arch.m4 Add build system 2010-08-31 13:41:27 -07:00
user-frame-larger-than.m4 In autoconf v2.68, AC_LANG_PROGRAM must be quoted 2011-11-28 11:16:33 -08:00
user-ioctl.m4 Add build system 2010-08-31 13:41:27 -07:00
user-libblkid.m4 In autoconf v2.68, AC_LANG_PROGRAM must be quoted 2011-11-28 11:16:33 -08:00
user-libuuid.m4 Add build system 2010-08-31 13:41:27 -07:00
user-nptl_guard_within_stack.m4 In autoconf v2.68, AC_LANG_PROGRAM must be quoted 2011-11-28 11:16:33 -08:00
user-selinux.m4 Autoconf selinux support 2011-01-28 12:45:19 -08:00
user-udev.m4 Move udev rules from /etc/udev to /lib/udev 2011-08-08 16:21:10 -07:00
user-zlib.m4 Add build system 2010-08-31 13:41:27 -07:00
user.m4 Move udev rules from /etc/udev to /lib/udev 2011-08-08 16:21:10 -07:00
zfs-build.m4 Make configure builtin-aware. 2012-07-26 13:40:18 -07:00
zfs-meta.m4 Add build system 2010-08-31 13:41:27 -07:00