misc/34596: slow gettimeofday in FreeBSD 4.5

[Andreas Gustafsson]

The following reply was made to PR misc/34596; it has been noted by GNATS.

From: gson at nominum.com (Andreas Gustafsson)
To: freebsd-gnats-submit at FreeBSD.org, jason at carrollgroup.org
Cc:  
Subject: Re: misc/34596: slow gettimeofday in FreeBSD 4.5
Date: Tue, 3 Jun 2003 14:01:36 -0700 (PDT)

 gettimeofday() is still really slow in FreeBSD 4.8-STABLE.  Some
 numbers from the test program submitted with misc/34596:
 
   FreeBSD 4.8, single Intel Xeon 2.8 GHz          delta: 5s 59701us
   NetBSD 1.6L, dual AMD Athlon MP 1800+           delta: 2s 801360us
   NetBSD 1.6T, single Transmeta Crusoe 600 MHz    delta: 2s 582755us
   Linux 2.4.9-31smp, dual AMD Athlon MP 1900+     delta: 0s 247116us
 
 That's more than 5 microseconds on a 2.8 GHz processor, or more than
 14000 clock cycles per call.
 
 Other info:
 
   $ grep -i time /var/run/dmesg.boot 
   Timecounter "i8254"  frequency 1193182 Hz
   $ sysctl kern.timecounter
   kern.timecounter.method: 0
   kern.timecounter.hardware: i8254
 
 -- 
 Andreas Gustafsson, gson at nominum.com