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Received: by minnie.vk1xwt.ampr.org with NNTP id AA5215 ; Tue, 22 Dec 92 11:01:36 EST Xref: sserve comp.sys.sun.admin:8067 comp.unix.bsd:9185 Path: sserve!manuel.anu.edu.au!munnari.oz.au!sgiblab!swrinde!cs.utexas.edu!uunet!mcsun!sun4nl!philapd!apdnm!apdnmi!wilko From: wilko@russia.idca.tds.philips.nl (Wilko Bulte) Newsgroups: comp.sys.sun.admin,comp.unix.bsd Subject: Increasing the buffer cache: how? Message-ID: <375@apdnmi.idca.tds.philips.nl> Date: 19 Dec 92 11:20:55 GMT Sender: news@idca.tds.philips.nl Lines: 27 I am currently trying to convince a Sun2 running Sunos 3.5 that it should use more memory for the buffercache. Using adb, I have changed the nbuf paramater in /vmunix. This works insofar that the boot message indicates the new value. What I don't understand is that the # of bytes reported as being used by the buffer cache does not change. Eg a value of 64 in nbuf gives the same # of bytes as 112 in nbuf (both using 575488 bytes). This is something I don't understand. In SysV NBUF gives the number of buffers, and each buffer has the same size as the disk block used on the particular filesystem type. A different parameter NHBUF gives the number of hashbuffers. Maybe this has something to do with the BSD filesys? Please help to solve my ignorance ;-) Wilko -- | / o / / _ Wilko Bulte Domain: wilko@idca.tds.philips.nl |/|/ / / /( (_) EasyNet: HLDE01::BULTE_W uucp : [mcsun,sun4nl]!philapd!wilko |d|i|g|i|t|a|l| Equipment Enterprise - IISS/SE voice: +3155-432372 fax: +3155-432103 DTN: 829 2372 PO Box 245 - 7300 AE Apeldoorn - The Netherlands