Messages in this thread | ![/](/images/icornerl.gif) | | Date | Tue, 01 Apr 2003 17:10:29 -0800 | From | "Martin J. Bligh" <> | Subject | Re: 2.5.66-mm2 |
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> +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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