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Re: [vfio-users] Disk Performance

Hi again,

Yep, I just copied and pasted it. Thanks for updating my script, I've added the changes.

Thanks again,

On Sun, Apr 3, 2016 at 5:33 AM, Bob Dawes <xochipilli4 yahoo com> wrote:
My apologies as you appear to have inherited all my unnecessary configuration options on the block device. As I'm messing around with qemu and I don't really understand that driver yet I tend to explicitly set every option so next time I use the VM with a new testing version of qemu my VM doesn't do unpredictable things because some feature I'm not messing with got switched on or off.

You may prefer to always have the author's best settings which in the general case is usually advisable and is achieved by leaving parameters implicit. For your config this would be:

-drive if=none,format=raw,cache=none,cache.direct=on,file=/media/500GB/win10.img,aio=native,id=ssd2 \
-object iothread,id=iothread2 \
-device virtio-blk-pci,drive=ssd2,iothread=iothread2

Naturally, you will find most authors tend to be cautious about switching on experimental or risky features, so to test those you usually have to explicitly set parameters. You can type 'info qtree' in the qemu console and check the configs parameters if you are interested in the fine details, but I wouldn't explicitly set the parameters unless you know you need something.

On 03/04/16 03:26, Nick Sarnie wrote:

Thanks for your detailed post. I believe I have already changed my script to make sense, thanks to the previous reply. I've attached it again below. For networking, I am using a wireless card where I cannot create a bridge, and my IP changes very often. Is there a simple way to manually create a tap with this? I wasn't able to get either of the 2 most popular tutorials working.


export QEMU_AUDIO_DRV=pa
qemu-system-x86_64 -enable-kvm \
-m 5120 \
-cpu host \
-smp 6,sockets=1,cores=6,threads=1 \
-device vfio-pci,host=01:00.0,x-vga=on,multifunction=on \
-device vfio-pci,host=01:00.1 \
-vga none \
-device vfio-pci,host=00:12.0 \
-device vfio-pci,host=00:12.2 \
-device vfio-pci,host=00:16.0 \
-device vfio-pci,host=00:16.2 \
-soundhw ac97 \
-rtc base=localtime \
-netdev user,id=net0 \
-device virtio-net-pci,netdev=net0 \
-drive if=none,format=raw,cache=none,cache.direct=on,file=/media/500GB/win10.img,aio=native,id=ssd2,discard=off,detect-zeroes=off \
-object iothread,id=iothread2 \
-device virtio-blk-pci,drive=ssd2,request-merging=on,iothread=iothread2,modern-pio-notify=on,config-wce=off

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