Hi, I notice that domain 0 gives bad performance with disk I/O. Domain 0 was given about 55MB RAM. With the same configuration, Linux on raw hardware gives far better performance. While a raw Linux OS gives a disk read throughput of around 20MB/sec (without any caching effects), dom0 (using the Xen.2.0.4 kernel with linux kernel 2.6.10) gives only about 2-3MB/sec throughput. Any pointers to the reasons for this difference will be greatly helpful. Thanks, pradheep. ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
> I notice that domain 0 gives bad performance with disk I/O. Domain 0 > was given about 55MB RAM. With the same configuration, Linux on raw > hardware gives far better performance. While a raw Linux OS gives a > disk read throughput of around 20MB/sec (without any caching effects), > dom0 (using the Xen.2.0.4 kernel with linux kernel 2.6.10) gives only > about 2-3MB/sec throughput. > > Any pointers to the reasons for this difference will be > greatly helpful.Your dom0 kernel probably does not have the proper driver for you disk controller compiled in... Ian ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_ide95&alloc_id396&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
Hi, On Sat, Feb 26, 2005 at 09:04:56PM -0000, Ian Pratt wrote:> > I notice that domain 0 gives bad performance with disk I/O. Domain 0 > > was given about 55MB RAM. With the same configuration, Linux on raw > > hardware gives far better performance. While a raw Linux OS gives a > > disk read throughput of around 20MB/sec (without any caching effects), > > dom0 (using the Xen.2.0.4 kernel with linux kernel 2.6.10) gives only > > about 2-3MB/sec throughput. > > > > Any pointers to the reasons for this difference will be > > greatly helpful. > > Your dom0 kernel probably does not have the proper driver for you disk > controller compiled in...You probably loaded ide-generic which only supports PIO. Once loaded, you can''t load the chipset specific driver (which would support DMA) any more. Regards, -- Kurt Garloff <kurt@garloff.de> [Koeln, DE] Physics:Plasma modeling <garloff@plasimo.phys.tue.nl> [TU Eindhoven, NL] Linux: SUSE Labs (Director) <garloff@suse.de> [Novell Inc]