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Improve ZVOL queue behavior.

Browse Source 
The Linux block device queue subsystem exposes a number of configurable
settings described in Linux block/blk-settings.c. The defaults for these
settings are tuned for hard drives, and are not optimized for ZVOLs. Proper
configuration of these options would allow upper layers (I/O scheduler) to
take better decisions about write merging and ordering.

Detailed rationale:

 - max_hw_sectors is set to unlimited (UINT_MAX). zvol_write() is able to
   handle writes of any size, so there's no reason to impose a limit. Let the
   upper layer decide.

 - max_segments and max_segment_size are set to unlimited. zvol_write() will
   copy the requests' contents into a dbuf anyway, so the number and size of
   the segments are irrelevant. Let the upper layer decide.

 - physical_block_size and io_opt are set to the ZVOL's block size. This
   has the potential to somewhat alleviate issue #361 for ZVOLs, by warning
   the upper layers that writes smaller than the volume's block size will be
   slow.

 - The NONROT flag is set to indicate this isn't a rotational device.
   Although the backing zpool might be composed of rotational devices, the
   resulting ZVOL often doesn't exhibit the same behavior due to the COW
   mechanisms used by ZFS. Setting this flag will prevent upper layers from
   making useless decisions (such as reordering writes) based on incorrect
   assumptions about the behavior of the ZVOL.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Etienne Dechamps
2011-09-05 15:15:45 +02:00
committed by Brian Behlendorf
parent b18019d2d8
commit 34037afe24
64 changed files with 1159 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Makefile.in
+5
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@@ -50,6 +50,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libavl/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libefi/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libnvpair/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libshare/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libspl/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libspl/asm-generic/Makefile.in
+5
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@@ -51,6 +51,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libspl/asm-i386/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libspl/asm-x86_64/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libspl/include/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libspl/include/ia32/Makefile.in
+5
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@@ -50,6 +50,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libspl/include/ia32/sys/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libspl/include/rpc/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libspl/include/sys/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libspl/include/sys/dktp/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libspl/include/sys/sysevent/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libspl/include/util/Makefile.in
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libunicode/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libuutil/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libzfs/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \
lib/libzpool/Makefile.in
+5
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@@ -52,6 +52,11 @@ am__aclocal_m4_deps = \
$(top_srcdir)/config/kernel-blk-end-request.m4 \
$(top_srcdir)/config/kernel-blk-fetch-request.m4 \
$(top_srcdir)/config/kernel-blk-queue-flush.m4 \
$(top_srcdir)/config/kernel-blk-queue-io-opt.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-hw-sectors.m4 \
$(top_srcdir)/config/kernel-blk-queue-max-segments.m4 \
$(top_srcdir)/config/kernel-blk-queue-nonrot.m4 \
$(top_srcdir)/config/kernel-blk-queue-physical-block-size.m4 \
$(top_srcdir)/config/kernel-blk-requeue-request.m4 \
$(top_srcdir)/config/kernel-blk-rq-bytes.m4 \
$(top_srcdir)/config/kernel-blk-rq-pos.m4 \