From: pjd@fred001.dynip.com
To: alan@lxorguk.ukuu.org.uk (Alan Cox)
Cc: root@chaos.analogic.com, johan.adolfsson@axis.com,
lk@tantalophile.demon.co.uk (Jamie Lokier),
hpa@zytor.com (H. Peter Anvin),
linux-kernel@vger.kernel.org, alan@lxorguk.ukuu.org.uk (Alan Cox),
terje.eggestad@scali.com (Terje Eggestad),
greearb@candelatech.com (Ben Greear),
davidel@xmailserver.org (Davide Libenzi),
george@mvista.com (george anzinger)
Subject: Re: gettimeofday() system call timing curiosity
Date: Fri, 8 Mar 2002 22:03:02 -0500 (EST) [thread overview]
Message-ID: <200203090303.g29332R14018@fred.cambridge.ma.us> (raw)
In-Reply-To: <E16jRCr-0007R7-00@the-village.bc.nu> from "Alan Cox" at Mar 08, 2002 08:43:13 PM
re: repeated gettimeofday() calls...
Alan Cox wrote:
>
> On a 1.8GHz athlon the "same" case occurs almost all the time. Machines
> without a TSC will probably never hit it due to the slow ISA transactions
> to talk to the PIT
Curiously, on a 1.7GHz P4 running RH7.1 (2.4.2 i686) it never hits
the same case, and takes slightly over a second to call gettimeofday a
million times. On my 600MHz Celeron at home (66MHz FSB, i810) running
2.4.17 with a similar .config (I started with the RH7.1 config out of
the source RPM) it takes .8 sec for a million calls and successive calls
return the same value about 20% of the time.
Peter Desnoyers
next prev parent reply other threads:[~2002-03-09 7:18 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-06 3:41 a faster way to gettimeofday? Ben Greear
2002-03-06 3:58 ` Davide Libenzi
2002-03-06 4:20 ` Ben Greear
2002-03-06 4:31 ` Davide Libenzi
2002-03-06 4:34 ` Davide Libenzi
2002-03-07 14:14 ` a faster way to gettimeofday? rdtsc strangeness Terje Eggestad
2002-03-07 14:41 ` Alan Cox
2002-03-07 15:43 ` Terje Eggestad
2002-03-07 16:17 ` Alan Cox
2002-03-07 18:32 ` H. Peter Anvin
2002-03-08 1:32 ` Jamie Lokier
2002-03-08 1:35 ` H. Peter Anvin
2002-03-08 1:57 ` Jamie Lokier
2002-03-08 18:30 ` gettimeofday() system call timing curiosity Jamie Lokier
2002-03-08 18:50 ` H. Peter Anvin
2002-03-08 20:16 ` Jamie Lokier
2002-03-08 20:30 ` Davide Libenzi
2002-03-08 18:54 ` Richard B. Johnson
2002-03-08 19:06 ` johan.adolfsson
2002-03-08 19:16 ` H. Peter Anvin
2002-03-08 19:45 ` Richard B. Johnson
2002-03-08 20:29 ` johan.adolfsson
2002-03-08 20:43 ` Alan Cox
2002-03-09 3:03 ` pjd [this message]
2002-03-09 18:51 ` Alan Cox
2002-03-09 3:15 ` Kelsey Hudson
2002-03-08 19:19 ` Alan Cox
2002-03-08 20:40 ` george anzinger
2002-03-06 20:45 ` a faster way to gettimeofday? dean gaudet
2002-03-06 21:31 ` Chris Ball
2002-03-06 22:25 ` george anzinger
2002-03-07 0:04 ` vsyscalls Mark Mielke
2002-03-06 16:16 ` a faster way to gettimeofday? Chris Friesen
2002-03-06 16:54 ` Richard B. Johnson
2002-03-11 22:47 ` OBATA Noboru
2002-03-12 13:06 ` Jamie Lokier
2002-03-12 15:12 ` OBATA Noboru
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