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| author | phk <phk@FreeBSD.org> | 1999-09-20 07:52:39 +0000 |
|---|---|---|
| committer | phk <phk@FreeBSD.org> | 1999-09-20 07:52:39 +0000 |
| commit | 965d9c056daf76619c8e96d8984663f84f9d6d32 (patch) | |
| tree | 7a3a44b3a6a8332b436111917c735f5928f6694b /lib/libc/stdio/setbuffer.c | |
| parent | 2fd30c0ea539f6ec55659cb2fbb9f21c5d07a797 (diff) | |
| download | FreeBSD-src-965d9c056daf76619c8e96d8984663f84f9d6d32.zip FreeBSD-src-965d9c056daf76619c8e96d8984663f84f9d6d32.tar.gz | |
On PIIX4 based SMP systems use the PMTMR register for timecounting.
It is about 2.5 microseconds or roughly 3 times faster to use this
"PIIX" timecounter than the "i8254" timecounter. Resolution is
also 3 times better.
The code cheats and don't register the PCI device, because other pieces
of code want to use it too.
Originally spotted by: msmith
Diffstat (limited to 'lib/libc/stdio/setbuffer.c')
0 files changed, 0 insertions, 0 deletions
