From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [PATCH 0/2] Batch writes to MMIO Date: Wed, 23 Apr 2008 17:05:43 +0300 Message-ID: <480F4237.90202@qumranet.com> References: <12089560583282-git-send-email-Laurent.Vivier@bull.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel@lists.sourceforge.net To: Laurent Vivier Return-path: In-Reply-To: <12089560583282-git-send-email-Laurent.Vivier@bull.net> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces@lists.sourceforge.net Errors-To: kvm-devel-bounces@lists.sourceforge.net List-Id: kvm.vger.kernel.org Laurent Vivier wrote: > These two patches allow to batch writes to MMIO. > > When kernel has to send MMIO writes to userspace, it stores them > in memory until it has to pass the hand to userspace for another > reason. This avoids to have too many context switches on operations > that can wait. > > Did you obtain any measurable performance benefit? > WARNING: this breaks compatibility with old userspace part. > > So it's just an RFC :) -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone