Messages in this thread | | | Date | Wed, 14 Aug 2002 01:40:08 -0700 | From | William Lee Irwin III <> | Subject | Re: [patch 3/21] scaled writeback throttling levels |
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On Sun, Aug 11, 2002 at 12:38:32AM -0700, Andrew Morton wrote: > (resend) > get_page_state() is showing up on profiles on some big machines. It is > a quite expensive function and it is being called too often. > The patch replaces the hardwired RATELIMIT_PAGES with a calculated > amount based on the amount of memory in the machine and the number of > CPUs.
dbench 256 on 16x/16G numaq:
Throughput 50.5397 MB/sec (NB=63.1747 MB/sec 505.397 MBit/sec) 256 procs
c013bf74 5827289 74.4428 .text.lock.highmem c013b7d0 797024 10.1819 kunmap_high c013b5dc 482436 6.16306 kmap_high c012e53c 87883 1.12269 file_read_actor c0114820 65764 0.840126 scheduler_tick c013bcbc 32857 0.419744 blk_queue_bounce c013564c 31874 0.407186 rmqueue c012f260 29442 0.376118 generic_file_write c01113b8 28706 0.366715 smp_apic_timer_interrupt c0143d1c 26503 0.338572 block_prepare_write c0105394 20555 0.262587 default_idle c012dec0 19920 0.254475 unlock_page c014333c 17401 0.222295 __block_prepare_write c013b558 16545 0.21136 flush_all_zero_pkmaps c0135d28 14959 0.191099 page_cache_release c013fb30 11923 0.152315 generic_file_llseek c013429c 11059 0.141277 lru_cache_add c0135b10 10277 0.131287 __alloc_pages c0140124 9841 0.125717 vfs_write c0143dc8 8732 0.11155 generic_commit_write c012dcb4 8051 0.10285 add_to_page_cache c016d620 7884 0.100717 ext2_get_block - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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