From owner-freebsd-mips@FreeBSD.ORG Tue Jul 19 12:33:39 2011 Return-Path: Delivered-To: freebsd-mips@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id ADDB8106566B; Tue, 19 Jul 2011 12:33:39 +0000 (UTC) (envelope-from c.jayachandran@gmail.com) Received: from mail-ww0-f50.google.com (mail-ww0-f50.google.com [74.125.82.50]) by mx1.freebsd.org (Postfix) with ESMTP id C203A8FC16; Tue, 19 Jul 2011 12:33:38 +0000 (UTC) Received: by wwe6 with SMTP id 6so3909913wwe.31 for ; Tue, 19 Jul 2011 05:33:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=Qadfl2novgUNfUWuSaYl/jGPk83ee6JWpI5OSKlKH2c=; b=YPStDLmt2jGF+7vvfP0PoT68hmUjGR+gzHJAHwaaJdxdJy/PnYZyidH8gvn2sNMQIu P4d4jnX6SXHzCF4W/2B05hnGpe35mYO67Lc1v9DrS7OLARzQs+84bC0AmVdOWJLy+aaV MOnTVID3lsI0AuDdVFhch7OKCIzY4/01qn1SM= MIME-Version: 1.0 Received: by 10.216.234.143 with SMTP id s15mr681348weq.66.1311078817588; Tue, 19 Jul 2011 05:33:37 -0700 (PDT) Received: by 10.216.173.211 with HTTP; Tue, 19 Jul 2011 05:33:37 -0700 (PDT) In-Reply-To: References: Date: Tue, 19 Jul 2011 18:03:37 +0530 Message-ID: From: "Jayachandran C." To: Attilio Rao Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: Warner Losh , freebsd-mips@freebsd.org Subject: Re: Bumping MAXCPU for MIPS configurations X-BeenThere: freebsd-mips@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Porting FreeBSD to MIPS List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 Jul 2011 12:33:39 -0000 On Tue, Jul 19, 2011 at 5:18 PM, Attilio Rao wrote: > 2011/7/19 Jayachandran C. : >> On Tue, Jul 19, 2011 at 6:37 AM, Attilio Rao wrote= : >>> 2011/7/3 Jayachandran C. : >>>> On Wed, Jun 29, 2011 at 4:48 PM, Attilio Rao wro= te: >>>>> 2011/6/29 Jayachandran C. : >>>>>> On Wed, Jun 29, 2011 at 3:10 PM, Attilio Rao w= rote: >>>>>>> [ Please CC me in replies as I'm not subscribed to this mailing lis= t ] >>>>>>> >>>>>>> I'm planning to bump MAXCPU for all the kernel configurations >>>>>>> requiring it, as long as the latest cut of largeSMP changes is >>>>>>> completed. >>>>>>> >>>>>>> Anyway, I'm not really sure what MIPS configurations may benefit fr= om >>>>>>> a larger number of MAXCPU. Probabilly XLP should, for what I've hea= rd, >>>>>>> but I'd like to get a precise mapping between configurations that w= ant >>>>>>> to bump the number and the actual maximum number of CPUs to be >>>>>>> supported. >>>>>> >>>>>> An XLP SoC has 32 cpus (8cores x 4 hw threads per core), and 4 of >>>>>> these can be interconnected to have upto 128 cpus. =A0We have an XLP >>>>>> port running on one chip with 32cpus, but there is interest in tryin= g >>>>>> out 2 chip (64cpus) and 4 chip(128 cpus) configurations, so this is >>>>>> something I want to do when I get access to multi-chip boards for >>>>>> FreeBSD development. >>>>> >>>>> I'll bump MAXCPU to 128 for XLP then, thanks. >>>>> Do you have informations about XLR? >>>> >>>> For XLR the the MAXCPU should be 32 (8 cores x 4 threads per core on >>>> the SoC). We cannot connect multiple chips together like the XLP. >>> >>> So what do you think about this patch?: >>> http://www.freebsd.org/~attilio/maxcpu_bump.diff >>> >>> I already got Marcel's approval on ia64 part, but I need you review >>> the mips bits. >> >> For the XLP changes, we don't really need 128 for MAXCPU now. =A0The ICI >> interface driver which is needed to connect multiple XLPs together to >> get 64/128 cpus have not been checked in yet. =A0I plan to do this a few >> months down the line. > > As I'm going to bump the MAXCPUs for all the architectures now, where > needed, I'm not sure why we should not do that now, even if the full > support is not ready yet. > > If you are strongly against the change I won't commit it, otherwise it > would be good to bump now, along with amd64 and ia64. I have no issues with bumping it up to 128. Thought I would just note that we don't support it yet, and hopefully we can remedy that soon :) JC.