Date: Thu, 9 May 1996 08:20:44 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: davidg@Root.COM Cc: s_koyin@eduserv.its.unimelb.EDU.AU, questions@freebsd.org Subject: Re: Disk cache? Message-ID: <199605090620.IAA01660@labinfo.iet.unipi.it> In-Reply-To: <199605090409.VAA01491@Root.COM> from "David Greenman" at May 8, 96 09:08:54 pm
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> All file accesses in FreeBSD are cached and the dynamic cache can grow as
> large as the amount of RAM in your machine.
Is this really true ? from vm_pageout.c (2.1R) I see the following,
...
if (cnt.v_page_count > 1024) {
cnt.v_cache_max = (cnt.v_free_count - 1024) / 2;
cnt.v_cache_min = (cnt.v_free_count - 1024) / 8;
cnt.v_inactive_target = 2*cnt.v_cache_min + 192;
} else {
cnt.v_cache_min = 0;
cnt.v_cache_max = 0;
cnt.v_inactive_target = cnt.v_free_count / 4;
}
I assume it means that there is a reserve of pages for other stuff
than file buffers.
Luigi
====================================================================
Luigi Rizzo Dip. di Ingegneria dell'Informazione
email: luigi@iet.unipi.it Universita' di Pisa
tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy)
fax: +39-50-568522 http://www.iet.unipi.it/~luigi/
====================================================================
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