From owner-freebsd-fs@FreeBSD.ORG Tue Sep 15 18:38:02 2009 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 66BA9106568B for ; Tue, 15 Sep 2009 18:38:02 +0000 (UTC) (envelope-from zbeeble@gmail.com) Received: from mail-ew0-f208.google.com (mail-ew0-f208.google.com [209.85.219.208]) by mx1.freebsd.org (Postfix) with ESMTP id 9B38F8FC37 for ; Tue, 15 Sep 2009 18:38:01 +0000 (UTC) Received: by ewy4 with SMTP id 4so4352034ewy.36 for ; Tue, 15 Sep 2009 11:38:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type; bh=WyusQeGrGkDcoX8aM3k6lLvrY2Bdldpv3kzcW+FncQg=; b=wb7v9iv4V4HHD0aFzninfISsSbgHILkEZH4MrITUyQzXp4dQWq+KKywZdLA/k3EN6q caLsDhR3El9Zf4o8Oys9GJJcorUygny1k9wv/ZdUbxaOeDk4PO4ih7j1YrzLfJcTIx0H PK7MjmTqRiKDUShr0r3Scx3QCK2tTaJUbcYi0= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=q7l4XFM9zVC/9CR67zBGY9VclT6/IY8wrF7yLLEE/DxJP1IzIUsM0+KlkjDMyi/CZe OzGCjKX3jtycop750a895HtGXSkh6R5Lw2NpCT4cDDGGMrB76WkcNbypukykJjKKZG2+ 4j5A+i0RsyV0ZzoxHveOujcNrFFR8ehcrIPBQ= MIME-Version: 1.0 Received: by 10.216.71.133 with SMTP id r5mr1348002wed.180.1253039880206; Tue, 15 Sep 2009 11:38:00 -0700 (PDT) In-Reply-To: <200909150047.n8F0l0MS096713@freefall.freebsd.org> References: <200909150047.n8F0l0MS096713@freefall.freebsd.org> Date: Tue, 15 Sep 2009 14:38:00 -0400 Message-ID: <5f67a8c40909151138l4c4fcd3cnc31bf3f59a781052@mail.gmail.com> From: Zaphod Beeblebrox To: linimon@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-fs@freebsd.org, freebsd-bugs@freebsd.org Subject: Re: kern/138790: [zfs] ZFS ceases caching when mem demand is high X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Sep 2009 18:38:02 -0000 On Mon, Sep 14, 2009 at 8:47 PM, wrote: > Old Synopsis: ZFS ceases caching when mem demand is high > New Synopsis: [zfs] ZFS ceases caching when mem demand is high > > Responsible-Changed-From-To: freebsd-bugs->freebsd-fs > Responsible-Changed-By: linimon > Responsible-Changed-When: Tue Sep 15 00:46:39 UTC 2009 > Responsible-Changed-Why: > Over to maintainer(s). > I have a question on this: Are we back to the old fight on dividing the system memory resource between cache and paging again? This seems like a major regression for using ZFS over UFS. The idea that this might be happening has caused me to regard my ZFS store as a largely nfs/smb appliance. Certainly it does well in this role --- and dedicating a system to many terrabytes of store isn't the end-of-the-world, but having used ZFS on my laptop --- and all the pain that incurs --- I'm shy about using ZFS on anything that isn't essentially a disk appliance. ZFS should be better than that. If the cache/VM aren't integrated on FreeBSD, are they integrated in OpenSolaris?