Date: Thu, 21 Jun 2001 14:51:38 +0200 (CEST) From: Martin Blapp <mb@imp.ch> To: <smp@FreeBSD.org> Cc: Brad Karp <bkarp@icsi.berkeley.edu>, <phk@FreeBSD.org> Subject: RE: clock speedup on SMP boxes Message-ID: <20010621144914.P766-100000@levais.imp.ch> In-Reply-To: <20010621143000.I766-100000@levais.imp.ch>
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Hi,
Just gettimeofday() produces 8sec time drifting now. No need
to use poll() in our little programm I sent previously.
There is no time drifting if we used a 100% load programm with
just poll().
Very strange. Do you have some idea ?
Martin
Martin Blapp, mb@imp.ch
------------------------------------------------
Improware AG, UNIX solution and service provider
Zurlindenstrasse 29, 4133 Pratteln, Switzerland
Phone: +41 79 370 26 05, Fax: +41 61 826 93 01
------------------------------------------------
> #include <sys/types.h>
> #include <sys/time.h>
> #include <err.h>
> #include <fcntl.h>
> #include <poll.h>
>
> #define DATA "/dev/zero"
>
> int
> main(void)
> {
> int fd;
> struct pollfd pfd;
>
> fd = open(DATA, O_RDONLY);
> if(fd < 0) {
> err(1, "open()");
> }
> for(;;) {
> int nfds;
> struct timeval tv;
> struct timezone tz;
>
> pfd.fd = fd;
> pfd.events = POLLRDNORM;
> pfd.revents = 0;
>
> nfds = poll(&pfd, 1, 0);
> gettimeofday(&tv, &tz);
> }
> return (0);
> }
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