Date: Fri, 07 Jul 2006 12:41:15 +0800 From: David Xu <davidxu@freebsd.org> To: current@freebsd.org Subject: sysenter syscall Message-ID: <44ADE5EB.1090300@freebsd.org>
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Hi,
Today I have tested sysenter sycall vs int0x80 syscall, I have done
the work several monthes ago, now I have imported it into perforce,
the branch name is davidxu_sysenter.
Here are some benchmark results:
1. pure geteuid() syscall:
x int80_syscall.txt
+ sysenter_syscall.txt
+--------------------------------------------------------------------------+
| + |
| x + |
| xxx ++ |
|x x xxxx + + ++++ |
| |_A_| |___A_M_||
+--------------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 10 2390403 2562187 2525720 2508262.9 53926.058
+ 10 3855570 4169162 4139662 4103079.4 95933.507
Difference at 95.0% confidence
1.59482e+06 +/- 73117.4
63.5825% +/- 2.91506%
(Student's t, pooled s = 77817.9)
2. mysql super-smack:
x mysql_int80.txt
+ mysql_sysenter.txt
+--------------------------------------------------------------------------+
| x + |
| x + + |
| x xx + +++ |
|x x xxxx x x x x + + +++++ +|
| |______MA________| |___A___| |
+--------------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 15 19212.09 19911.76 19417.23 19449.863 165.25167
+ 15 20250.48 20603.26 20408.12 20411.395 76.260797
Difference at 95.0% confidence
961.531 +/- 96.2398
4.94364% +/- 0.494809%
(Student's t, pooled s = 128.693)
Hardware is dual-core Pentium-D. I thought sysenter is useless as I
said on dragonflybsd mail list, but the fact is a little different
here, so I was wrong.
David Xu
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