[Qemu-devel] can not enable replaying and miss object type

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To record block operations the drive,I use parameters as shown in Figure 1, it 
succeed, but the whole process is very slow.

To replay block operations the drive,I use parameters as shown in Figure 2, 
after entering the startup options, the system stay black screen.

I can't solve this problem, I hope to get some advice.

Both block-record.img and block-replay.img are the same mirror increments.

When I add parameter  "-netdev user,id=net1 -device rtl8139,netdev=net1 -object 
filter-replay,id=replay,netdev=net1", I encountered an error as shown in Figure 
6.

I can't understand why the object type  is missing, I hope I can get help.

 Figure:
1.qemu-system-x86_64  -m 3G -drive file=block-record.img,if=none,id=img-direct 
-drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay -device 
ide-hd,drive=img-blkreplay   -icount shift=0,rr=record,rrfile=replay-block.bin 
-localtime  -monitor stdio  -vnc :1
2.qemu-system-x86_64  -m 3G -drive file=block-replay.img,if=none,id=img-direct 
-drive driver=blkreplay,if=none,image=img-direct,id=img-blkreplay -device 
ide-hd,drive=img-blkreplay   -icount shift=0,rr=replay,rrfile=replay-block.bin 
-localtime  -monitor stdio  -vnc :1
3.qemu-img create -f qcow2 -b ubuntu11.04.img  block-record.img
4.qemu-img create -f qcow2 -b ubuntu11.04.img block-replay.img
5.-netdev user,id=net1 -device rtl8139,netdev=net1 -object 
filter-replay,id=replay,netdev=net1
6.qemu-system-x86_64: -object filter-replay,id=replay,netdev=net1: invalid 
object type: filter-replay