[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: RE: [Xen-devel] Bad read performance
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@xxxxxxxxxx> [Koeln, DE] Physics:Plasma modeling <garloff@xxxxxxxxxxxxxxxxxxx> [TU Eindhoven, NL] Linux: SUSE Labs (Director) <garloff@xxxxxxx> [Novell Inc] Attachment:
pgpKbre5_m8wo.pgp
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