Date: Wed, 15 Jun 2005 12:08:45 -0400 From: Karim Fodil-Lemelin <kfl@xiphos.ca> To: freebsd-net@freebsd.org Subject: (panic) Lots of network memory needed Message-ID: <42B0528D.9080308@xiphos.ca>
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Hello, From kernel tuning page (http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning-kernel-limits.html) Some sentence about nmbclusters says: "Under no circumstances should you specify an arbitrarily high value for this parameter as it could lead to a boot time crash." Now I want to push the limits where I need 4KB buffer for each of the 32000 connections I want this server to handle. If I do the math: (32000 (conns) * 4 (KB/buffer) * 2 (buffer/conn)) / 2048 (KB/cluster) = 128000 clusters So I set this arbitrary high value in loader.conf under (kern.ipc.nmbclusters) and no surprises I get panic: pmap_enter invalid page directory pdir=0x3cb063, va=0xfff800 (va has a weird address here) I know I am pushing the limits here but I have plenty of memory (2GB) on this system (after all its just 250MB for network memory ;) and this is mainly just experimentation. I would like some pointers toward fixing this. Is there another variable tied into this (I guess so)? Could anybody points me to a technical document that would explain the relationship with that (those) other(s) presumed variable(s)? Thank you, Karim
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