Shouldn't cache=none be the default for drives?

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Hello,

I'm conducting some performancetests with KVM-virtualized CentOSes. One thing I noticed is that guest I/O performance seems to be significantly better for virtio-based block devices ("drive"s) if the cache=none argument is used. (This was with a rather powerful storage system backend which is hard to saturate.)

So: Why isn't cache=none be the default for drives?

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Troels
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