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Re: 2.5.66-mm2
> +ext3-concurrent-block-allocation-hashed.patch
>
> Change the ext3 BKL-removal code to use the hashed locking and
> percpu_counters from ext2.
Ho hum. All very strange. Kernbench seems to be really behaving itself
quite well now, but SDET sucks worse than ever. The usual 16x NUMA-Q
machine ....
Kernbench: (make -j N vmlinux, where N = 2 x num_cpus)
Elapsed System User CPU
2.5.66-mm2 44.04 81.12 569.40 1476.75
2.5.66-mm2-ext3 44.43 84.10 568.82 1469.00
Kernbench: (make -j N vmlinux, where N = 16 x num_cpus)
Elapsed System User CPU
2.5.66-mm2 44.36 89.64 575.45 1499.25
2.5.66-mm2-ext3 44.79 91.15 575.48 1488.25
Kernbench: (make -j vmlinux, maximal tasks)
Elapsed System User CPU
2.5.66-mm2 44.06 87.03 574.31 1501.00
2.5.66-mm2-ext3 44.35 89.33 573.47 1495.75
DISCLAIMER: SPEC(tm) and the benchmark name SDET(tm) are registered
trademarks of the Standard Performance Evaluation Corporation. This
benchmarking was performed for research purposes only, and the run results
are non-compliant and not-comparable with any published results.
Results are shown as percentages of the first set displayed
SDET 1 (see disclaimer)
Throughput Std. Dev
2.5.66-mm2 100.0% 1.9%
2.5.66-mm2-ext3 92.6% 1.8%
SDET 2 (see disclaimer)
Throughput Std. Dev
2.5.66-mm2 100.0% 0.0%
2.5.66-mm2-ext3 88.4% 5.1%
SDET 4 (see disclaimer)
Throughput Std. Dev
2.5.66-mm2 100.0% 1.9%
2.5.66-mm2-ext3 26.3% 7.8%
SDET 8 (see disclaimer)
Throughput Std. Dev
2.5.66-mm2 100.0% 1.0%
2.5.66-mm2-ext3 8.0% 3.1%
SDET 16 (see disclaimer)
Throughput Std. Dev
2.5.66-mm2 100.0% 1.0%
2.5.66-mm2-ext3 5.6% 1.6%
SDET 32 (see disclaimer)
Throughput Std. Dev
2.5.66-mm2 100.0% 0.7%
2.5.66-mm2-ext3 4.7% 1.5%
SDET 64 (see disclaimer)
Throughput Std. Dev
2.5.66-mm2 100.0% 0.7%
2.5.66-mm2-ext3 3.6% 1.9%
SDET 128 (see disclaimer)
Throughput Std. Dev
2.5.66-mm2 100.0% 0.6%
2.5.66-mm2-ext3 3.9% 0.4%
diffprofile for SDET 128 (+ worse with ext3, - better)
10410044 1594.1% total
8799596 2479.9% default_idle
649656 15845.3% __down
347530 0.0% .text.lock.sched
218233 8660.0% schedule
183618 9984.7% __wake_up
117605 0.0% .text.lock.transaction
30896 0.0% do_get_write_access
18162 1319.9% .text.lock.attr
14815 0.0% journal_dirty_metadata
13655 0.0% journal_get_write_access
12762 79762.5% cpu_idle
11023 7252.0% __blk_queue_bounce
9404 0.0% start_this_handle
9310 0.0% journal_add_journal_head
5566 0.0% block_write_full_page
5478 0.0% journal_stop
4210 0.0% ext3_get_inode_loc
4127 668.9% __find_get_block_slow
3852 1965.3% .text.lock.sem
3660 0.0% ext3_mark_iloc_dirty
3630 184.5% __find_get_block
3360 239.8% __brelse
2911 0.0% ext3_do_update_inode
2672 16700.0% scsi_request_fn
2565 0.0% journal_start
2432 0.0% journal_commit_transaction
1945 0.0% journal_unlock_journal_head
1937 0.0% ext3_new_inode
1820 0.0% ext3_orphan_del
1731 13315.4% __make_request
1606 1784.4% .text.lock.ioctl
1591 103.9% .text.lock.base
1575 0.0% find_next_usable_block
1563 142.2% __block_prepare_write
1483 0.0% ext3_orphan_add
1428 0.0% __journal_unfile_buffer
1367 0.0% journal_get_undo_access
1365 156.7% kmap_atomic
1360 1766.2% default_wake_function
1344 40.5% do_anonymous_page
1232 0.0% ext3_reserve_inode_write
1180 64.7% current_kernel_time
1172 0.0% journal_invalidatepage
1139 136.4% kmalloc
1121 37366.7% mempool_alloc
1017 0.0% __journal_file_buffer
...
-1080 -55.4% d_alloc
-1105 -67.4% filemap_nopage
-1153 -100.0% ext2_new_inode
-1182 -37.3% pte_alloc_one
-1186 -46.4% copy_process
-1470 -98.4% .text.lock.highmem
-1496 -95.2% .text.lock.file_table
-1555 -64.2% file_move
-1596 -94.4% __read_lock_failed
-1601 -61.8% path_release
-1602 -100.0% grab_block
-1649 -51.0% copy_mm
-2413 -57.4% remove_shared_vm_struct
-2540 -78.9% free_pages_and_swap_cache
-3236 -93.1% .text.lock.namei
-3600 -47.5% page_add_rmap
-4671 -72.9% path_lookup
-4720 -95.8% .text.lock.dcache
-4921 -42.9% __d_lookup
-5140 -86.9% follow_mount
-6005 -39.7% copy_page_range
-6534 -72.0% release_pages
-6905 -94.2% .text.lock.dec_and_lock
-7158 -74.2% atomic_dec_and_lock
-7307 -47.3% page_remove_rmap
-9399 -48.2% zap_pte_range
Looks just like horrific semaphore contention to me.
I dumped the full results to:
ftp://ftp.kernel.org/pub/linux/kernel/people/mbligh/benchmarks/2.5.66-mm2/
ftp://ftp.kernel.org/pub/linux/kernel/people/mbligh/benchmarks/2.5.66-mm2-ext3/
as you probably want the gory detail, knowing you ;-)
M.
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