lkml.org 
[lkml]   [2003]   [Jan]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subjectkernbench-16 on 2.5.59 vs 2.5.59-mm6
This test does a make -j X vmlinux on a 2.4.17 kernel compile with
a very large config set. X is 16 times the number of cpus. This is
on a 16-way NUMA-Q so we end up with a make -j256 (it's fastest
with about 1.5 * num_cpus), but this test puts more stress on the
kernel.

None of the other tests I ran showed anything very interesting.
(the new NUMA sched stuff from Ingo seems to give mild degredations
in -mjb ... probably needs some more tuning).

Going from 59 to 59-mm6, I get:

Kernbench-16:
Elapsed User System CPU
2.5.59 47.45 568.02 143.17 1498.17
2.5.59-mm6 47.18 567.15 138.62 1495.50

Summary: Scheduler stuff seems like a wash (schedule -> do_schedule).
Seems to be some sort of rearrangement of the dcache stuff which
appears to be mildly beneficial (what's going in there?).
current_kernel_time seems to be less than half the cost, I'm assuming
the new frlock kernel time stuff is doing that. This workload doesn't
stress that very much, so I'll find a better test for that one ...

2.5.59: 1657 current_kernel_time
2.5.59-mm6: 747 current_kernel_time

diffprofile (+ gets worse, - gets better).

2023 do_schedule
485 dentry_open
289 .text.lock.file_table
132 clear_page_tables
131 pgd_ctor
113 vma_merge
75 kmap_atomic
62 get_empty_filp
51 can_vma_merge_after
-52 dget_locked
-54 vfs_follow_link
-55 kmem_cache_free
-66 buffered_rmqueue
-74 __copy_to_user_ll
-94 page_add_rmap
-102 fd_install
-110 __copy_from_user_ll
-117 __d_lookup
-157 do_generic_mapping_read
-188 path_lookup
-273 .text.lock.dec_and_lock
-275 file_ra_state_init
-283 do_anonymous_page
-331 pfn_to_nid
-405 page_remove_rmap
-413 pgd_alloc
-427 vm_enough_memory
-910 current_kernel_time
-1222 .text.lock.namei
-2076 total
-2133 schedule

-
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/

\
 
 \ /
  Last update: 2005-03-22 13:32    [W:0.027 / U:3.368 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site