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Re: [Qemu-devel] RFC: Universal encryption on QEMU I/O channels

From: Paolo Bonzini
Subject: Re: [Qemu-devel] RFC: Universal encryption on QEMU I/O channels
Date: Wed, 04 Feb 2015 16:04:33 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0

On 04/02/2015 15:34, Daniel P. Berrange wrote:
> > GIO doesn't provide writev either, so it's not a good match for
> > non-encrypted migration, which really tries hard to do no copies in
> > userspace.
> Ok, maybe RDMA will still need QEMUFile, but for non-encrypted TCP
> I'd hope to be able to achieve zero-copy with the new API too - it
> would certainly be my intention/goal.

For GIO/GIOChannel, you'd have to choose between zerocopy and many
syscalls, or one copy and few syscalls.  Since every page has two iov
entries, one of which is just 8 bytes, one copy and few syscalls is
probably faster---but still only half the speed of writev.


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