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Date: Sun, 3 Feb 2002 14:57:31 -0800 (PST)
From: Jason Carroll <jason@carrollgroup.org>
To: freebsd-gnats-submit@FreeBSD.org
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Subject: misc/34596: slow gettimeofday in FreeBSD 4.5
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>Number:         34596
>Category:       misc
>Synopsis:       slow gettimeofday in FreeBSD 4.5
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Feb 03 15:00:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Jason Carroll
>Release:        FreeBSD 4.5
>Organization:
>Environment:
FreeBSD galois 4.5-RELEASE FreeBSD 4.5-RELEASE #0: Sat Feb  2 16:28:26 EST 2002     jason@galois:/usr/obj/usr/src/sys/LOCAL  i386

(I also tried this with the GENERIC kernel that came with the 4.5 release)
>Description:
gettimeofday() seems to be slower (by about 5 times) than it was under FreeBSD 4.2.  I ran the program below on an Intel 1.9ghz machine with 4.5 FreeBSD installed (with the GENERIC kernel), and it took approximately 5 seconds, or 5ms per call to gettimeofday.  I then boot the same machine with a 4.2 kernel and the same program ran in under 1 second.  See the next window for the program source.

Any ideas?  This doesn't seem like a critical problem, but I thought it should be mentioned.

Thanks
>How-To-Repeat:
#include <sys/time.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
    timeval tv, st, en;

    gettimeofday(&st, NULL);

    for (int i = 0; i < 1000000; i++) {
        gettimeofday(&tv, NULL);
    }

    gettimeofday(&en, NULL);

    printf("delta: %ds %dus\n", en.tv_sec- st.tv_sec, en.tv_usec - st.tv_usec);
}
>Fix:
      
>Release-Note:
>Audit-Trail:
>Unformatted:

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