Improve qemu-nbd performance by 4400 %
This patch allows to reduce the boot time from an NBD server from 225 seconds to 5 seconds (time between the "boot cd:0" and the kernel init) for the following command lines: ./qemu-nbd -t ../ISO/debian-500-powerpc-netinst.iso and ./ppc-softmmu/qemu-system-ppc -cdrom nbd:localhost:1024 This patch combines the reply header and payload send operation. Signed-off-by: NLaurent Vivier <laurent@vivier.eu> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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