From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nauzad Sadry Subject: File System Performance - 10x slower Date: Tue, 11 Jan 2005 10:30:02 -0800 Message-ID: Reply-To: Nauzad Sadry Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Sender: xen-devel-admin@lists.sourceforge.net Errors-To: xen-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: xen-devel@lists.sourceforge.net List-Id: xen-devel@lists.xenproject.org Hello all I am evaluating File I/O performance using Xen & comparing it with baseline (Fedora Core 3, with 2.6.9 kernel). Here are the commands that I use for I/O write I/O: dd if=/dev/zero of=file1 bs=4K count=256K read I/O: dd of=/dev/null if=file1 bs=4K count=256K Here are some numbers (all test results are reported in MB/second) Read I/O - Baseline Fedora Core 3 - 32 - XEN domain 0 - 9.3 - XEN domain 1 - 2.3 Write I/O - Baseline Fedora Core 3 - 22 - XEN domain 0 - 9.8 - XEN domain 1 - 2.5 - Dom0 (without starting xend) results in 2x slower performance - DomU results in 9-10x slower performance I get similar results for domain-1 using both File-based & LVM-based VBD Can someone why I am getting such huge difference in performance compared to baseline ?? Thanks Nauzad ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt