From owner-freebsd-current@FreeBSD.ORG Tue May 19 02:03:46 2009 Return-Path: Delivered-To: current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5F60D106566B for ; Tue, 19 May 2009 02:03:46 +0000 (UTC) (envelope-from mat.macy@gmail.com) Received: from an-out-0708.google.com (an-out-0708.google.com [209.85.132.240]) by mx1.freebsd.org (Postfix) with ESMTP id 110718FC17 for ; Tue, 19 May 2009 02:03:45 +0000 (UTC) (envelope-from mat.macy@gmail.com) Received: by an-out-0708.google.com with SMTP id c3so1993406ana.13 for ; Mon, 18 May 2009 19:03:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:message-id:subject:from:to:cc :content-type:content-transfer-encoding; bh=DngOhXoHYJdJQXyzxTaKn3qBMqZJdpAwS4mIvrn/Gv0=; b=WS8CaPVUUPFff35JS1mn7eFI8gmPhmTgx893vpQkEtDrvKufjJi6oMJglejkQbiESi qEDW85CiISI3L7CEub/va7nCvgpckeIXbFDyUq8oy3JdYIDo23NJ9Kpai7ZpB0Xv1jcu 1g6R4VqAnRSy6/uakLbLsVpGCcEkIoph3v4j8= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=v2qDqVqHSMfyZ0RPlRmxPXTzLYstFsV5v5+4RQp/ZqnEUdaP+GLeseCqBZ5j9HfPXX xw0PlyKjX2rGcirSrPK08hoh1ro63WUw2rKGyc4me01zxU8QeuhzvoyYcu83vmhvgDm/ /C+orb8mJEIFL3VbAWy9dNvoTEtYO+lNOqtTg= MIME-Version: 1.0 Sender: mat.macy@gmail.com Received: by 10.100.41.9 with SMTP id o9mr10083244ano.155.1242698625150; Mon, 18 May 2009 19:03:45 -0700 (PDT) In-Reply-To: <20090519015713.GS82547@egr.msu.edu> References: <20090518145614.GF82547@egr.msu.edu> <3c1674c90905181659g1d20f0f1w3f623966ae4440ec@mail.gmail.com> <20090519012202.GR82547@egr.msu.edu> <3c1674c90905181826p787a346cie90429324444a9c4@mail.gmail.com> <20090519015713.GS82547@egr.msu.edu> Date: Mon, 18 May 2009 19:03:45 -0700 X-Google-Sender-Auth: f9eaeb67df24f644 Message-ID: <3c1674c90905181903o281406fbia135c295738d73b5@mail.gmail.com> From: Kip Macy To: Adam McDougall Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: current@freebsd.org, Larry Rosenman Subject: Re: Fatal trap 12: page fault panic with recent kernel with ZFS 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: Tue, 19 May 2009 02:03:46 -0000 > Thanks, I appreciate all this work. =A0Not allowing inactive pages to > shrink the ARC sounds great as an option. =A0I would be willing to bet > that allowing inactive pages to shrink the arc would be far less > detrimental to most people who aren't running a constant busy file > server load, and its definitely important to try to protect untuned > boxes. Allowing NFS to use ARC buffers might be one solution to that. > Do you have any suggestions for increasing the amount of memory ARC > can use? =A0I've had difficulty increasing kmem past a few gigs on any > of my recent builds (all past where kmem was changed so it could be > more than ~2g) because at some point the kernel would stop booting. > If I increase them too far, a few lines of the booting kernel would > print, followed by a long stream of page fault panics or something > with a sudden reboot. =A0With the recent change allowing the use of > direct mem, the ARC could easily use ample memory except it turned > out not to be stable. As of r192216 that should not be a probably any more. The maximum kmem is now 512GB. It will be at least a year or two before anyone bumps his head against that.