Date: Tue, 21 Aug 2001 15:42:51 -0400 (EDT) From: Mike Silbersack <silby@silby.com> To: Giorgos Verigakis <verigak@algol.vtrip-ltd.com> Cc: <freebsd-hackers@freebsd.org> Subject: Re: Zope's performance issues Message-ID: <Pine.BSF.4.30.0108211539240.74527-100000@niwun.pair.com> In-Reply-To: <Pine.LNX.4.30.0108211617510.24969-100000@algol.vtrip-ltd.com>
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On Tue, 21 Aug 2001, Giorgos Verigakis wrote: > On Tue, 21 Aug 2001, Mike Silbersack wrote: > > I suspect that the reload time spiking is due to our initial sequence > > number generation scheme, which is currently shared with OpenBSD. This > > will be changing RSN, which will likely change how your benchmarks look. > > (They should look better after the change.) > > I don't understand. How is it related with the initial sequence number? > > > > > > I'm curious about the reload time, though. Is it really in seconds? What > > is it measuring? > > Yes it's in seconds. What I wanted to measure was the time a page needs to > be loaded, because the results I was getting were unexpectable. The current scheme causes problems with TIME_WAIT recycling, which may cause long delays in establishing new connections if you're connection to the same host rapidly enough to cause TIME_WAIT recycling to be an issue. This is why there's a huge spike only when you get to 1000 hits/second. There could be other reasons, of course, but this will overshadow the others. I tested your test program with apache, and the change is noticeable. So, hold off on further testing until later this week. Mike "Silby" Silbersack To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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