Kevin Wolf wrote:
Anthony Liguori schrieb:
I guess the main block code is not as defensive as I thought it was. This patch
uses qemu_memalign to allocate the buffers for IO so that you don't get errors
when using O_DIRECT.
Actually, the block code should be able to deal with unaligned buffers
since qemu rev. 4599. This change seems to be present in current KVM.
That was what I thought at first too.
Can you tell exactly which operation failed?
The aio requests fail with -22 (EINVAL).
But apart from that, qemu_memalign is the right thing to do, because
copying from/into an aligned buffer in the block code costs performance
(don't know how much, though).
Regards,
Anthony Liguori
Kevin
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