[vfio-users] Disk Performance

[Nick Sarnie]

Hi again,

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

Thanks again,
sarnex

On Sun, Apr 3, 2016 at 5:33 AM, Bob Dawes <xochipilli4 at 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:
>
> Hi,
>
> 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.
>
> Thanks,
> sarnex
>
> #!/bin/sh
> 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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