From: zhaolei@cn.fujitsu.com (Zhaolei)
Subject: [ltt-dev] Degression from "fix-x86_64-sysenter-trace-race"
Date: Tue, 13 Jan 2009 09:12:57 +0800 [thread overview]
Message-ID: <496BEA99.7030901@cn.fujitsu.com> (raw)
Hello,
I tested lttng's performance by tbench program in x86_64 platform.
And I found patch named "fix-x86_64-sysenter-trace-race" makes large
degression(about 5%).
Here is test result:
[----------PATCH----------] [TBENCH]
lttng-kernel-trace-thread-flag-s390 1317.08
lttng-kernel-trace-thread-flag-sh 1315.61
lttng-kernel-trace-thread-flag-sparc 1305.02
lttng-kernel-trace-thread-flag-sparc64 1314.06
lttng-kernel-trace-thread-flag-um 1316.35
fix-x86_64-sysenter-trace-race 1250.89
lttng-kernel-trace-thread-flag-x86 1259.07
lttng-kernel-trace-thread-flag-xtensa 1252.86
lttng-kernel-trace-thread-flag-api 1253.35
lttng-use-kernel-trace-thread-flag-api 1251.9
stringify-support-commas 1247.11
And if I remove this patch, degression is not happened:
[----------PATCH----------] [TBENCH]
lttng-kernel-trace-thread-flag-s390 1307.73
lttng-kernel-trace-thread-flag-sh 1317.33
lttng-kernel-trace-thread-flag-sparc 1306.85
lttng-kernel-trace-thread-flag-sparc64 1303.62
lttng-kernel-trace-thread-flag-um 1312.08
lttng-kernel-trace-thread-flag-x86 1308.5
lttng-kernel-trace-thread-flag-xtensa 1310.77
lttng-kernel-trace-thread-flag-api 1309.05
lttng-use-kernel-trace-thread-flag-api 1310.26
stringify-support-commas 1307.69
I want to know system's benchmark when lttng turn off,
so test environment is following:
- Compile kernel with lttng patch up to given one and default config,
- Install kernel, Reboot system,
(don't load any lttng module, don't run ltt-arm or lttctl)
- Begin tbench test.
Plarform is RHEL5.2 root filesystem with linux-2.6.27.7 and lttng-0.60 patchs.
Hardware is 4 * Intel(R) Xeon(R) X5260 at 3.33GHz with 4G memory.
I think [fix-x86_64-sysenter-trace-race] should not leads so large degression,
But I tested several times and result is near.
B.R.
Zhaolei
next reply other threads:[~2009-01-13 1:12 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-13 1:12 Zhaolei [this message]
2009-01-13 2:13 ` Mathieu Desnoyers
2009-01-13 2:56 ` Zhaolei
2009-01-13 2:56 ` Zhaolei
2009-01-13 2:56 ` Zhaolei
2009-01-13 4:24 ` Mathieu Desnoyers
2009-01-13 7:59 ` Zhaolei
2009-01-13 13:47 ` Zhaolei
2009-01-15 1:41 ` Mathieu Desnoyers
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