From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx3.redhat.com (mx3.redhat.com [172.16.48.32]) by int-mx1.corp.redhat.com (8.11.6/8.11.6) with ESMTP id i9RFEPr20358 for ; Wed, 27 Oct 2004 11:14:25 -0400 Received: from fedex.ist.ucf.edu (fedex.ist.ucf.edu [132.170.193.23]) by mx3.redhat.com (8.12.11/8.12.11) with ESMTP id i9RFED9u023772 for ; Wed, 27 Oct 2004 11:14:19 -0400 Received: from [132.170.193.89] (wks89.ist.ucf.edu [132.170.193.89]) by fedex.ist.ucf.edu (8.12.11/8.12.8) with ESMTP id i9RFE6XL026417 for ; Wed, 27 Oct 2004 11:14:06 -0400 Message-ID: <417FBB3D.6060002@ist.ucf.edu> Date: Wed, 27 Oct 2004 11:14:05 -0400 From: Judd Tracy MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [linux-lvm] High loads when writting to LVM Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: linux-lvm@redhat.com I have a system that I am testing out lvm on to get a feeling about stability and performance. Stability right now seems good, but I am a little worried about the performance currently I am writing out a large file ~1TB using dd if=/dev/zero of=test bs=1M and am noticing the load seams extreamly high "5.21, 5.26, 5.17". Most of the work is being done in dd but I also notice that kswapd0 is also working fairly heavily. Is this to be expected with LVM or do i have things setup wrong. Write performance seems to be around 100MB/s on an XFS filesystem. System: Opteron 242 1.4Ghz 2 GB RAM Tyan S2882 3W-9000-12 in raid-5 with one hot spare 12 Seagate 250MB SATA drives Fedora Core 2 Kernel 2.6.8-1.521 Judd Tracy jtracy@ist.ucf.edu