[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] poor I/O performance on domU
Anthony Liguori wrote: I think that's a reasonable answer. It should be easy to test though. Try your same test on dom0 and use /dev/loopN where N is the loopbackdevice that has your rootfs on it. Only rootfs is exported from loopback device and I'm benchmarking access to dom0's /dev/hda exported to domU as read-only. As the rootfs image is quite small (16MB), I can't easily test access speeds because it will fit into cache. The difference between testing /dev/loopN access on dom0 and the virtual block device on domU should tell you the Xen-imposed performance penalty. I did a quick test on my system and there was a 50% slowdown using the loopback device doing your test so I imagine it's that. Accessing exported loopback or some other device? -jkt -- cd /local/pub && more beer > /dev/mouth ------------------------------------------------------- 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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