Date: Tue, 05 Apr 2011 15:54:46 +0100 From: Pete French <petefrench@ingresso.co.uk> To: avg@FreeBSD.org, petefrench@ingresso.co.uk Cc: spawk@acm.poly.edu, freebsd-stable@FreeBSD.org, freebsd@jdc.parodius.com Subject: Re: Kernel memory leak in 8.2-PRERELEASE? Message-ID: <E1Q77eY-0001Mc-Ke@dilbert.ticketswitch.com> In-Reply-To: <4D9B275B.3060000@FreeBSD.org>
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> Having swap provides some cushion. Swap kind of smooths any bursts. (And it can > also slow things down as a side effect) This is why I got rid of it - my application is a lot of CGI scripts. The overload condition is that we run out of memory - and we run *way* out of memory .... its never just a little overflow, it;s either handleable or completely crushed. But swap makes that mre llikely to happen, because as the processes are swapped out they run slower, take longer to finish and thus use memory for longer. What I saw was that as soon as any web server would start tos wap it would swftly fall down. Without swap they stay up, but reject requests. Its a better failure mode... these days I run a compormise - swap on internal machines, and no swap on customer facing ones, but lots of RAM (16 gig). -pete.
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