[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] File System Performance - 10x slower
Ian Pratt said: >> 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). > > 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 had exactly this problem because the drivers for various IDE chipsets are missing in the default xen0 config. When I added the VIA 82cxxx driver back into the config, performance returned to normal (i.e. went from ~4MB/sec to ~38MB/sec in hdparm). It might be worth enabling the various IDE drivers in the standard configuration as I also tripped up over the fact the PDC 202xx driver was missing when I tried Xen on another machine. It wouldn't boot until I used a xen0 kernel with that driver included. Regards, Leigh. ------------------------------------------------------- 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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/xen-devel
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