From owner-freebsd-arch@FreeBSD.ORG Sat Mar 20 20:03:00 2010 Return-Path: Delivered-To: freebsd-arch@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D2E78106564A for ; Sat, 20 Mar 2010 20:03:00 +0000 (UTC) (envelope-from alan.l.cox@gmail.com) Received: from mail-pv0-f182.google.com (mail-pv0-f182.google.com [74.125.83.182]) by mx1.freebsd.org (Postfix) with ESMTP id A75998FC08 for ; Sat, 20 Mar 2010 20:03:00 +0000 (UTC) Received: by pvc7 with SMTP id 7so953742pvc.13 for ; Sat, 20 Mar 2010 13:03:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:reply-to:in-reply-to :references:date:message-id:subject:from:to:cc:content-type; bh=JLTq/EML72PMPz50E81sMrvNHgsmXT1cQDYCCtSQXDk=; b=HnER6hGt8kZuJBnGiw2zHIf1V7BOsziZqVvyFq0W7vSa7oAj9r8Y2VUXgg6duLver5 qfHlSsp0/p2FAXEPuUW8juPIJ/y9cSYuk8Lf+IVmyebzOuuprwCCeY6M+G2LJrz3+WDn ZkLIDPZmPmj6mziv27aPzmeWmfPg29s5bG/UE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:reply-to:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; b=s0r0+32tgXk+eYcuBoLrkUVDCnqEdnfikuWQvK9C9HCgX9ifeInlmIlULAGI+sv35k h0+WIV4jx/mvI4Z+nyRLU025Rls7Jg6s0M1VtSSd+1waqzlbd0fCCYDwg3yU8MH+iyuT UEE3upWOS1WxQflMCtOWuQFNgAPKFHBpvI3VA= MIME-Version: 1.0 Received: by 10.143.24.41 with SMTP id b41mr474035wfj.98.1269113898971; Sat, 20 Mar 2010 12:38:18 -0700 (PDT) In-Reply-To: <4BA4E7A9.3070502@FreeBSD.org> References: <4BA4E7A9.3070502@FreeBSD.org> Date: Sat, 20 Mar 2010 14:38:18 -0500 Message-ID: From: Alan Cox To: Alexander Motin Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: FreeBSD-Current , freebsd-arch@freebsd.org Subject: Re: Increasing MAXPHYS X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: alc@freebsd.org List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Mar 2010 20:03:00 -0000 2010/3/20 Alexander Motin > Hi. > > With set of changes done to ATA, CAM and GEOM subsystems last time we > may now get use for increased MAXPHYS (maximum physical I/O size) kernel > constant from 128K to some bigger value. [snip] > All above I have successfully tested last months with MAXPHYS of 1MB on > i386 and amd64 platforms. > > So my questions are: > - does somebody know any issues denying increasing MAXPHYS in HEAD? > - are there any specific opinions about value? 512K, 1MB, MD? > > For now, I think it should machine-dependent. The virtual memory system should have no problems with MAXPHYS of 1MB on amd64 and ia64. Alan