From owner-freebsd-performance@FreeBSD.ORG Thu Mar 22 13:43:56 2007 Return-Path: X-Original-To: freebsd-performance@FreeBSD.ORG Delivered-To: freebsd-performance@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 4A01916A400 for ; Thu, 22 Mar 2007 13:43:56 +0000 (UTC) (envelope-from cheffo@FreeBSD-BG.org) Received: from blah.sun-fish.com (blah.sun-fish.com [217.18.249.150]) by mx1.freebsd.org (Postfix) with ESMTP id 04A7B13C468 for ; Thu, 22 Mar 2007 13:43:53 +0000 (UTC) (envelope-from cheffo@FreeBSD-BG.org) Received: from blah.sun-fish.com (localhost [127.0.0.1]) by blah.sun-fish.com (Postfix) with ESMTP id F35181B10F02; Thu, 22 Mar 2007 14:43:52 +0100 (CET) Received: from [192.168.3.125] (hater.cmotd.com [192.168.3.125]) by blah.sun-fish.com (Postfix) with ESMTP id ED8711B10EA4; Thu, 22 Mar 2007 14:43:52 +0100 (CET) Message-ID: <46028813.5030209@FreeBSD-BG.org> Date: Thu, 22 Mar 2007 15:43:47 +0200 From: Cheffo User-Agent: Thunderbird 1.5.0.10 (X11/20070307) MIME-Version: 1.0 To: "roma.a.g" References: <1036039198.20070321153412@gmail.com> <200703211354.l2LDsKnV080911@lurza.secnetix.de> <1465093066.20070322162026@gmail.com> In-Reply-To: <1465093066.20070322162026@gmail.com> Content-Type: text/plain; charset=windows-1251; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV using ClamSMTP on BLAH Cc: freebsd-performance@FreeBSD.ORG Subject: Re: Slow on heavy I/O operations. X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Mar 2007 13:43:56 -0000 Roman Gorohov. wrote: -CUT- > > That seems like true, and I forget to mention that 2/3 of swap is > located at physical disk(da0). > [idle@hst ~]#swapinfo > Device 1K-blocks Used Avail Capacity Type > /dev/da0s1b 524160 463300 60860 88% Interleaved > /dev/rvn0b 1048448 578724 469724 55% Interleaved > Total 1572608 1042024 530584 66% > > But what I can't understand - why such non-critical(as it seems to me) disk activity, > cause 100% busyness for disk? Its claim to be 40.000MB/s transfers, but > sometimes its 100% busy when iostat show only 1 MB/s. > > Regards, Roman. Imagine 1000 request per second and every request is 1KB, and compare it with a single request that is 1MB. In first variant your disk will be 100% busy and in the second 2-3%. I think you can guess why ? > > _______________________________________________ > freebsd-performance@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-performance > To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.org" > > -- Best Wishes, Stefan Lambrev ICQ# 24134177