From: "H. Peter Anvin" <hpa@zytor.com>
To: Erik Bosman <ejbosman@cs.vu.nl>
Cc: Arjan van de Ven <arjan@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Andrea Arcangeli <andrea@cpushare.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] x86: Implement prctl PR_GET_TSC and PR_SET_TSC
Date: Sun, 13 Apr 2008 15:02:45 -0700 [thread overview]
Message-ID: <48028305.8040104@zytor.com> (raw)
In-Reply-To: <Pine.GSO.4.56.0804132320260.6537@keg.few.vu.nl>
Erik Bosman wrote:
>
> It took me a while, but I have done some tests om my system with and
> without my patch applied.
>
> All deamons but klogd/syslogd were shut down andI used the following
> command:
>
> LMBENCH_SCHED="SINGLE" \
> /usr/lib/lmbench/bin/{i686-pc,x86_64}-linux-gnu/lat_ctx -s 0 2
>
> The variation was quite high so I ran it a 1000 times for each
> configuration.
>
> x86_32, patch applied, 1000x repeated, avg: 1.319, rmse: 0.081
> x86_32, patch not applied, 1000x repeated, avg: 1.335, rmse: 0.107
>
> x86_64, patch applied, 1000x repeated, avg: 1.417, rmse: 0.0716
> x86_64, patch not applied, 1000x repeated, avg: 1.423, rmse: 0.0745
>
> This is on a core 2 duo E6300.
>
OK, so it sounds like there is no measurable difference. Good.
-hpa
next prev parent reply other threads:[~2008-04-13 22:10 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-11 16:55 [PATCH 2/3] x86: Implement prctl PR_GET_TSC and PR_SET_TSC Erik Bosman
2008-04-12 19:49 ` Arjan van de Ven
2008-04-12 20:48 ` H. Peter Anvin
2008-04-12 21:05 ` Erik Bosman
2008-04-12 21:12 ` Arjan van de Ven
2008-04-13 21:51 ` Erik Bosman
2008-04-13 22:02 ` H. Peter Anvin [this message]
2008-04-14 8:42 ` Ingo Molnar
2008-04-13 22:24 ` [PATCH 2/3-REVISED] " Erik Bosman
2008-04-14 3:58 ` Arjan van de Ven
2008-04-14 8:48 ` Ingo Molnar
2008-04-14 10:57 ` [PATCH 2/3] " Michael Kerrisk
2008-04-14 11:59 ` Erik Bosman
2008-04-14 12:21 ` Michael Kerrisk
2008-04-26 22:47 ` dean gaudet
2008-04-26 22:51 ` H. Peter Anvin
2008-04-26 23:14 ` dean gaudet
2008-04-26 23:46 ` H. Peter Anvin
2008-04-27 0:29 ` dean gaudet
2008-04-27 0:37 ` H. Peter Anvin
2008-04-27 0:47 ` David Miller
2008-04-15 7:29 ` Andrew Morton
2008-04-15 7:46 ` Ingo Molnar
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