Date: Fri, 16 May 2003 09:59:52 +0200 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: freebsd-hackers@freebsd.org Subject: Re: Optimizations. Message-ID: <8315.1053071992@critter.freebsd.dk> In-Reply-To: Your message of "Fri, 16 May 2003 09:07:32 %2B0200." <20030516070732.GT45118@garage.freebsd.pl>
next in thread | previous in thread | raw e-mail | index | archive | help
In message <20030516070732.GT45118@garage.freebsd.pl>, Pawel Jakub Dawidek writ es: >On Thu, May 15, 2003 at 11:14:43PM -0700, Terry Lambert wrote: >+> What about "gettimeofday()"? There are a number of applications, >+> particularly HTTP protocol applications, with strict timestamp >+> logging requirements, mandated by standards. The tend to call >+> gettimeofday() up to six times per transaction. Examples will >+> include HTTP proxies, L7 load balancers, and proxy caches. Any >+> box competing in the Cisco CSS/F5 falls into this category. Terry, you should have your own late-night chat show. That way you could be funny for the people who have nothing else to do than watch late-night television showing ill informed people trying to be funny without knowing what they talk about. More importantly, it would remove you from where I have to listen to your silly drivel. Even a cursory glance at our source code, something I am of course fully aware that you are not guilty off, would teach you a few interesting facts, something I'm equally aware that you have successfully resisted for the last 10 years. But for the benefit of the remainder of hackers@: gettimeofday() is the least of apaches problems: It is already a totally lockless systemcall. >That's right:) >Look at functions in /sys/kern/kern_tc.c. There are so many little >functions. How about put __inline here and there? Try it, and you'll find that things get slower because the code gets bigger. >And second thing. Does anybody think about representing time in BCD code? Yes, I remember when we did things like that, on computers which operated naturally on BCD fields, and therefore tended to have a chance of calculating delta-times in finite times. Modern computers however, are binary. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?8315.1053071992>