From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nauzad Sadry Subject: Re: File System Performance - 10x slower Date: Tue, 11 Jan 2005 13:51:39 -0800 Message-ID: References: Reply-To: Nauzad Sadry Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: 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: Ian Pratt Cc: Steven Hand , xen-devel@lists.sourceforge.net List-Id: xen-devel@lists.xenproject.org Thanks guys for your help I will inspect the driver configuration in my system & get back. On using hdparm is found out that DMA is disabled by default in Xen (it was enabled on baseline) & I probably need to rebulid the kernel with this option turned on. If there are any other ways to turn on this option, please let me know Thanks Nauzad On Tue, 11 Jan 2005 19:11:53 -0000, Ian Pratt wrote: > > Check that the domain 0 kernel you are using has the appropriate drivers > for your hardware. It's probably using PIO or something daft. > > > I ask since it should be almost *impossible* to get anything more > > than a very small % slowdown on disk I/O unless things are very > > broken -- most of our benchmarks to date show 0% slowdown (and > > in some cases involving domU, a speedup due to additional buffering). > > Ian > ------------------------------------------------------- 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