Date: Thu, 20 Dec 2007 03:59:55 +1100 (EST) From: Bruce Evans <brde@optusnet.com.au> To: David G Lawrence <dg@dglawrence.com> Cc: freebsd-net@freebsd.org, freebsd-stable@freebsd.org Subject: Re: Packet loss every 30.999 seconds Message-ID: <20071220035129.R38221@delplex.bde.org> In-Reply-To: <20071219154856.GC25053@tnn.dglawrence.com> References: <D50B5BA8-5A80-4370-8F20-6B3A531C2E9B@eng.oar.net> <20071217102433.GQ25053@tnn.dglawrence.com> <CD187AD1-8712-418F-9F49-FA3407BA1AC7@eng.oar.net> <20071220011626.U928@besplex.bde.org> <20071219154856.GC25053@tnn.dglawrence.com>
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On Wed, 19 Dec 2007, David G Lawrence wrote: >> Try it with "find / -type f >/dev/null" to duplicate the problem almost >> instantly. > > FreeBSD used to have some code that would cause vnodes with no cached > pages to be recycled quickly (which would have made a simple find > ineffective without reading the files at least a little bit). I guess > that got removed when the size of the vnode pool was dramatically > increased. It might still. The data should be cached somewhere, but caching it in both the buffer cache/VMIO and the vnode/inode is wasteful. I may have been only caching vnodes for directories. I switched to using a find or a tar on /home/ncvs/ports since that has a very high density of directories. Bruce
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