[Qemu-discuss] raw diskimages

[westlake]

is there a nice tweak for raw disk images? here i'm trying the following 
and i'm wondering if I should be using "aio=threads"

according to benchmarks online "aio=threads" scores better than 
aio=native when ioeventfd is set to on
http://wiki.qemu.org/Features-Done/VirtioIoeventfd

i'm trying to understand this new iothread replacement over x-data-plane 
as previously I was using x-data-plane and I'm trying to find the 
equivalent with iothread.. I just care for virtual disk i/o performance 
in general ( I know I am able to use raw disks, but here I am just going 
for raw disk images)

HD_PATH='/vm/file.bin"
VDA="-drive 
if=none,id=drive0,cache=none,aio=native,format=raw,file=${HD_PATH} 
-device virtio-blk,drive=drive0,scsi=off,config-wce=off,x-data-plane=on"

currently trying with the new iothread,
VDA="-drive 
if=none,id=drive0,cache=none,aio=threads,format=raw,file=${HD_PATH},index=0 
-object iothread,id=iothread0 -device virtio-blk-pci,drive=drive0,scsi=off,
config-wce=off,iothread=iothread0,ioeventfd=on"

Any feedback I appreciate

thanks

QEMU 2.5.0 monitor - type 'help' for more information
(qemu) info block
info block
drive0 (#block131): /vm/file.bin (raw)
    Cache mode:       writeback, direct