From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vivek Subject: Re: need for 3G/1G split Date: Wed, 21 Mar 2007 16:08:21 +0530 Message-ID: <1174473501.9500.12.camel@localhost> References: <7783925d0703202115j11dbf254nc916252e4cd98e8a@mail.gmail.com> Reply-To: vivekutal@gmail.com Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:subject:from:reply-to:to:cc:in-reply-to:references:content-type:organization:date:message-id:mime-version:x-mailer:content-transfer-encoding; b=jKt/TZ6wGfuvQg4eQ7OzjfSi+sfsLUs6Y2k30/q4WaMiCgWu4g4kC4SzUyuQrJMQ0yx7HqUTTqdm1zmEQYax2cmNyWCfxgM8QvopBJ503HnxDr+8XSAz4fszP6EVVuzufn8Wl662jK9903vxzBuUw95Oe8TDJW4DILRl+bxGs3I= In-Reply-To: <7783925d0703202115j11dbf254nc916252e4cd98e8a@mail.gmail.com> Sender: linux-newbie-owner@vger.kernel.org List-Id: Content-Type: text/plain; charset="us-ascii" To: Rick Brown Cc: kernelnewbies , linux-newbie@vger.kernel.org > Why is kernel restricted to use virtual addresses of only 1 GB? Or > what is the need to split up the virtual address space into user > addresses and kernel addresses? We can have 4GB for kernel and 4GB for userspace but this has a overhead of flushing of tlb for every syscall. You can also make the split 2/2GB but this has a problem of having less user address space. 3/1 is a better choice. -- Vivek Kutal - To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs