From owner-freebsd-fs@FreeBSD.ORG Tue Aug 30 22:31:59 2011 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 C74DE106564A for ; Tue, 30 Aug 2011 22:31:59 +0000 (UTC) (envelope-from lev@FreeBSD.org) Received: from onlyone.friendlyhosting.spb.ru (onlyone.friendlyhosting.spb.ru [IPv6:2a01:4f8:131:60a2::2]) by mx1.freebsd.org (Postfix) with ESMTP id 8E5088FC16 for ; Tue, 30 Aug 2011 22:31:59 +0000 (UTC) Received: from lion.home.serebryakov.spb.ru (unknown [IPv6:2001:470:923f:1:6407:f3f9:7d93:d34c]) (Authenticated sender: lev@serebryakov.spb.ru) by onlyone.friendlyhosting.spb.ru (Postfix) with ESMTPA id 4DD334AC31; Wed, 31 Aug 2011 02:31:58 +0400 (MSD) Date: Wed, 31 Aug 2011 02:31:55 +0400 From: Lev Serebryakov Organization: FreeBSD Project X-Priority: 3 (Normal) Message-ID: <612137475.20110831023155@serebryakov.spb.ru> To: Kirk McKusick In-Reply-To: <201108302009.p7UK9CBQ085481@chez.mckusick.com> References: <317753422.20110830231815@serebryakov.spb.ru> <201108302009.p7UK9CBQ085481@chez.mckusick.com> MIME-Version: 1.0 Content-Type: text/plain; charset=windows-1251 Content-Transfer-Encoding: quoted-printable Cc: freebsd-fs@freebsd.org Subject: Re: Very inconsistent (read) speed on UFS2 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: lev@FreeBSD.org List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Aug 2011 22:31:59 -0000 Hello, Kirk. You wrote 31 =E0=E2=E3=F3=F1=F2=E0 2011 =E3., 0:09:12: > memory faster than the cleanup thread can produce it. The result is > that your read idles (e.g., appears to run slowly). It is random because > it depends on when you run out of memory. BTW, it could explain why some runs are slower than other. But my situation looks like opposite: some runs much faster than others. And it could not be read-from-cache if VM is sane. It is hard to belive, that VM will store 0.5GiB of read-once data when another 5GiB was read after that only in 2GiB of physical memory --=20 // Black Lion AKA Lev Serebryakov