On 10/14/2009 07:37 AM, Christoph Hellwig wrote:
Christoph, wasn't there a bug where the guest didn't wait for requests
in response to a barrier request?
Can't remember anything like that. The "bug" was the complete lack of
cache flush infrastructure for virtio, and the lack of advertising a
volative write cache on ide.
By "complete flush infrastructure", you mean host-side and guest-side
support for a new barrier command, yes?
But can't this be also implemented using QUEUE_ORDERED_DRAIN, and on the
host side disabling the backing device write cache? I'm talking about
cache=none, primarily.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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