Date: Thu, 21 Jul 2005 01:37:29 -0700 From: Peter Wemm <peter@wemm.org> To: freebsd-amd64@freebsd.org Cc: Petri Helenius <pete@he.iki.fi> Subject: Re: kernel memory Message-ID: <200507210137.29816.peter@wemm.org> In-Reply-To: <42DFDCCA.8050207@he.iki.fi> References: <42DFDCCA.8050207@he.iki.fi>
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On Thursday 21 July 2005 10:35 am, Petri Helenius wrote: > What is the maximum kernel memory for amd64? Addresses by default > seem to start with 0xffffffffxxxxxxxx so one could assume a 4gig > limitation? > > Pete 2GB for paged kernel memory. But in addition we access memory via the direct map area to avoid the need for temporary mappings in many cases. uma (malloc, mbufs) etc use this, as does the sfbuf temporary mapping system. -- Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com "All of this is for nothing if we don't go to the stars" - JMS/B5
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