diff options
| author | Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> | 2008-01-29 14:39:33 +0900 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2008-03-10 16:35:47 -0700 |
| commit | 4fe01c68eba53c3f324807faff71535218c41e9c (patch) | |
| tree | 43e061a07d84b2ec80cd40e91156d008e4d0ef55 /arch/ia64/kernel/perfmon_mckinley.h | |
| parent | cdeeeae056a429e729ae9e914fa8142ee45bee93 (diff) | |
[IA64] cleanup and improve fsys_gettimeofday
This patch does:
- Remove outdated comments (which someday I marked with "?").
- Reassemble instructions to fit them in fewer bundles.
- If McKinley Errata 9 workaround is not needed, the workaround
bundles will be patched out with NOPs. However it also not
needed to have a totally NOP bundle (nop * 3) before branch.
As a result, this makes the code path 3 (or 2) bundles shorter
(and remove 1 unnecessary stop bit). It seems to be 1% faster.
(10sec loop test, with nojitter @ Madison 1.5GHz x 4)
Before:
CPU 0: 0.14 (usecs) (0 errors / 69598875 iterations)
CPU 1: 0.14 (usecs) (0 errors / 69630721 iterations)
CPU 2: 0.14 (usecs) (0 errors / 69607850 iterations)
CPU 3: 0.14 (usecs) (0 errors / 69619832 iterations)
After:
CPU 0: 0.14 (usecs) (0 errors / 70257728 iterations)
CPU 1: 0.14 (usecs) (0 errors / 70309498 iterations)
CPU 2: 0.14 (usecs) (0 errors / 70280639 iterations)
CPU 3: 0.14 (usecs) (0 errors / 70260682 iterations)
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/perfmon_mckinley.h')
0 files changed, 0 insertions, 0 deletions