[Qemu-devel] Re: [RFC PATCH 04/20] Make QEMUFile buf expandable, and introduce qemu_realloc_buffer() and qemu_clear_buffer().

[Yoshiaki Tamura]

Avi Kivity wrote:
> On 04/21/2010 08:57 AM, Yoshiaki Tamura wrote:
> > Currently buf size is fixed at 32KB. It would be useful if it could
> > be flexible.
>
> Why is this needed? The real buffering is in the kernel anyways; this is
> only used to reduce the number of write() syscalls.

This was introduced to buffer the transfered guests image transaction ally on 
the receiver side.  The sender doesn't use it.
In case of intermediate state, we just discard this buffer.