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    Subject10.31 second kernel compile

    Let the kernel compile benchmarks continue!

    hardware: 24 way logical partition, 1.1GHz POWER4, 60G RAM

    kernel: 2.5.6 + ppc64 pagetable rework

    kernel compiled: 2.4.18 x86 with Martin's config

    compiler: gcc 2.95.3 x86 cross compiler

    # MAKE="make -j14" /usr/bin/time make -j14 bzImage
    make[1]: Leaving directory `/home/anton/intel_kernel/linux/arch/i386/boot'
    130.63user 71.31system 0:10.31elapsed 1957%CPU (0avgtext+0avgdata 0maxresident)k

    Due to the final link and compress stage, there is a fair amount of idle
    time at the end of the run. Its going to be hard to push that number
    lower by adding cpus.

    The profile results below show that kernel time is dominated by the low
    level ppc64 pagetable management. We are working to correct this, a lot
    of the overhead in __hash_page should be gone soon. The rest of the
    profile looks pretty good, do_anonymous_page and lru_cache_add show
    up high as they did in Martin's results.

    Thanks to Milton Miller who helped with the benchmarking, and the ppc64


    201150 total 0.0668
    129051 .idled

    43586 .__hash_page ppc64 specific
    6714 .local_flush_tlb_range ppc64 specific
    2773 .local_flush_tlb_page ppc64 specific

    2203 .do_anonymous_page
    2059 .lru_cache_add
    1379 .__copy_tofrom_user

    1220 .hpte_create_valid_pSeriesLP ppc64 LPAR specific

    1039 .save_remaining_regs
    871 .do_page_fault

    575 .plpar_hcall ppc64 LPAR specific

    554 .d_lookup
    545 .rmqueue
    482 .copy_page
    475 .__strnlen_user
    391 .__free_pages_ok
    389 .zap_page_range
    366 .atomic_dec_and_lock
    296 .__find_get_page
    287 .set_page_dirty
    278 .page_cache_release
    218 .handle_mm_fault
    199 .__flush_dcache_icache
    175 .schedule
    173 .sys_brk
    163 .exit_notify
    156 .do_no_page
    152 .lru_cache_del
    147 .__wake_up
    146 .copy_page_range
    139 .ppc_irq_dispatch_handler
    135 .find_vma
    131 .__lru_cache_del
    128 .fget
    126 .link_path_walk
    115 .do_generic_file_read
    113 .pte_alloc_map
    113 .filemap_nopage
    109 .clear_user_page
    106 .fput
    104 .__alloc_pages
    101 .nr_free_pages

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      Last update: 2005-03-22 13:24    [W:0.025 / U:7.276 seconds]
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