From owner-freebsd-current@FreeBSD.ORG Mon May 8 16:56:21 2006 Return-Path: X-Original-To: current@freebsd.org Delivered-To: freebsd-current@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 91B6A16A402 for ; Mon, 8 May 2006 16:56:21 +0000 (UTC) (envelope-from ivoras@fer.hr) Received: from lara.cc.fer.hr (lara.cc.fer.hr [161.53.72.113]) by mx1.FreeBSD.org (Postfix) with ESMTP id B3E5D43D48 for ; Mon, 8 May 2006 16:56:20 +0000 (GMT) (envelope-from ivoras@fer.hr) Received: from [127.0.0.1] (localhost.cc.fer.hr [127.0.0.1]) by lara.cc.fer.hr (8.13.6/8.13.4) with ESMTP id k48Gtmwf070842 for ; Mon, 8 May 2006 18:55:49 +0200 (CEST) (envelope-from ivoras@fer.hr) Message-ID: <445F7814.90905@fer.hr> Date: Mon, 08 May 2006 18:55:48 +0200 From: Ivan Voras User-Agent: Mozilla Thunderbird 1.0.6 (X11/20050921) X-Accept-Language: en-us, en MIME-Version: 1.0 To: current@freebsd.org References: <61809.192.168.1.21.1147030254.squirrel@192.168.1.21> <86d5epp5tv.fsf@xps.des.no> <20060508132721.36915d94@Magellan.Leidinger.net> In-Reply-To: <20060508132721.36915d94@Magellan.Leidinger.net> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Subject: Re: I_686 MMX / 3DNOW / SSE / SSE2 ? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 May 2006 16:56:21 -0000 Alexander Leidinger wrote: > The patches which port the revamped FPU handling from DFly don't have > this expensive behavior for every switch. AFAIR only when the kernel > used the FPU some context is saved. It also allows to use SIMD > instructions in the kernel (this may be beneficial in some places). For what it's worth - it would be interesting to see if XOR calculations in GRAID3 or VINUM can be speeded up by using SSE (I think SSE3 is needed for 128 bit integer ops?)