Re: Help understanding slow down

Phy Prabab
2004-05-24T07:22:36Z

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For more information, I ran the same test on 2.4.21
with profiling enabled:
22133 total 0.0102
18255 default_idle 351.0577
634 do_page_fault 0.4412
342 do_no_page 0.3654
231 d_lookup 0.8134
173 do_anonymous_page 0.2790
157 system_call 2.8036
157 pte_alloc_atomic 0.2973
130 do_wp_page 0.1222
102 __find_get_page 1.5000
99 atomic_dec_and_lock 1.3750
90 handle_mm_fault 0.2616
89 zap_page_range 0.0792
86 link_path_walk 0.0343
62 mraccessf 0.6458
59 permission 0.4470
56 mrunlock 0.5600
42 strncpy_from_user 0.5526
40 strnlen_user 0.4545
40 __do_generic_file_read 0.0316
39 __free_pages 1.2188
35 filemap_nopage 0.0648

Also refomated the previous report to make it
readable:

> 317955 total 0.1302
> 263633 poll_idle 4545.3966
> 6764 do_page_fault 5.1951
> 3650 kmap_atomic 28.2946
> 3288 __d_lookup 12.0000
> 1856 atomic_dec_and_lock 30.4262
> 1823 do_no_page 2.4870
> 1398 do_anonymous_page 3.1991
> 1168 link_path_walk 0.5266
> 1138 find_get_page 19.9649
1.2450
> 1075 nfs_lookup_revalidate 0.7739
> 1039 page_remove_rmap 5.0437
> 1006 in_group_p 9.4906
> 987 handle_mm_fault 2.2742
> 913 do_wp_page 1.1499
> 816 finish_task_switch 6.6885
> 772 tg3_poll 2.6621
> 762 rpcauth_lookup_credcache 1.3275
> 722 page_add_file_rmap 4.1257
> 623 system_call 14.1591
> 607 strncpy_from_user 6.8202
>
> Thanks again!
> Phy
>
>
>
> --- William Lee Irwin III <wli@holomorphy.com>
> wrote:
> > On Sun, May 23, 2004 at 11:23:37PM -0700, Phy
> Prabab
> > wrote:
> > > Sorry for the late reply. No this is a dual
> Xeon
> > > 3.06Ghz. All runs are with the same hardware
> and
> > same
> > > make/build system.
> > > How do I generate a profile of the system. I
> have
> > > alrady compiled profiling and have enabled the
> > kernel.
> >
> > readprofile -n -m /boot/System.map-`uname -r` |
> sort
> > -rn -k 1,1 | head -22
> >
> > No need for compiled-in support, just boot with
> > profile=1.
> >
> >
> > -- wli
>
>
>
>
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