Trond,
--On 21 January 2013 17:20:36 +0000 "Myklebust, Trond"
<Trond.Myklebust@xxxxxxxxxx> wrote:
That is correct. If you want zero-copy, then O_DIRECT is your thing
(with or without aio). Otherwise, the kernel will always write to disk
by copying through the page cache.
Thanks. From the crash dump it appeared to be accessing mapped memory
somehow, so I'll see whether QEMU is in fact using O_DIRECT contrary
to documentation.
--
Alex Bligh
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