From owner-freebsd-stable@FreeBSD.ORG Tue May 2 17:12:30 2006 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id EE49716A429 for ; Tue, 2 May 2006 17:12:30 +0000 (UTC) (envelope-from rwatson@FreeBSD.org) Received: from cyrus.watson.org (cyrus.watson.org [209.31.154.42]) by mx1.FreeBSD.org (Postfix) with ESMTP id BE10243D6E for ; Tue, 2 May 2006 17:12:23 +0000 (GMT) (envelope-from rwatson@FreeBSD.org) Received: from fledge.watson.org (fledge.watson.org [209.31.154.41]) by cyrus.watson.org (Postfix) with ESMTP id D1FEF46B11; Tue, 2 May 2006 13:12:22 -0400 (EDT) Date: Tue, 2 May 2006 18:12:22 +0100 (BST) From: Robert Watson X-X-Sender: robert@fledge.watson.org To: Dmitry Pryanishnikov In-Reply-To: <20060427160536.M96305@atlantis.atlantis.dp.ua> Message-ID: <20060502181118.M92256@fledge.watson.org> References: <20060427160536.M96305@atlantis.atlantis.dp.ua> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: freebsd-stable@freebsd.org Subject: Re: RELENG_4 -> 5 -> 6: significant performance regression X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 May 2006 17:12:34 -0000 On Thu, 27 Apr 2006, Dmitry Pryanishnikov wrote: > options INVARIANTS > options INVARIANT_SUPPORT In FreeBSD 5.x and FreeBSD 6.x, the INVARIANTS option has been significantly expanded to test a much larger set of invariants, and also incorporate kernel use-after-free checking, which involves memory scrubbing. This is great for catching bugs, but it will have a significant performance impact, especially for kernel-intensive loads. Robert N M Watson