From owner-freebsd-hackers Tue Apr 30 4: 2:52 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from HAL9000.wox.org (12-232-222-90.client.attbi.com [12.232.222.90]) by hub.freebsd.org (Postfix) with ESMTP id E500E37B405 for ; Tue, 30 Apr 2002 04:02:47 -0700 (PDT) Received: (from das@localhost) by HAL9000.wox.org (8.11.6/8.11.6) id g3UB3ER11427; Tue, 30 Apr 2002 04:03:14 -0700 (PDT) (envelope-from das) Date: Tue, 30 Apr 2002 04:03:14 -0700 From: David Schultz To: Rohit Grover Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: larger kernel virtual address space Message-ID: <20020430040314.A11282@HAL9000.wox.org> Mail-Followup-To: Rohit Grover , freebsd-hackers@FreeBSD.ORG References: <20020429231718.00B602756@sitemail.everyone.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20020429231718.00B602756@sitemail.everyone.net>; from rohit@gojuryu.com on Mon, Apr 29, 2002 at 04:17:18PM -0700 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Thus spake Rohit Grover : > I apologize for not checking the FAQs before asking the question. > http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/advanced.html#CHANGE-KERNEL-ADDRESS-SPACE > > How large can we make the KVA? This was recently discussed in the thread ``FreeBSD 4.5-STABLE not easily scalable to large servers ... ?'' on the stable and current lists; you'll probably find the information you want in the archives. The short answer is that KVA + UVA <= 4 GB on x86. So you could raise KVA to 3 GB, for instance, but then any given user process would only be able to address 1 GB of virtual memory. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message