blktrace vs ftrace

[Matthias Brugger]

On 02/02/2012 07:15 PM, Mulyadi Santosa wrote:
> On Thu, Feb 2, 2012 at 17:20, Matthias Brugger
> <matthias.bgg at googlemail.com>  wrote:
>> Hi all,
>>
>> I'm trying to analize I/O behavior of Qemu on the host.
>
> what is your complete command to invoke Qemu?

qemu -hda scheduler.raw -drive 
file=/mnt/disk/testdisk2.img,if=virtio,cache=none -m 1024 -enable-kvm -k 
es -smp 2 -vnc 127.0.0.1:10 -smb /home/matthias/nfs/

>
> sometimes Qemu's I/O behaviour can be modified by certain parameter.
> All I know recent Qemu release (>= 1.x) use iothread by default, which
> might explain your 4 threads reads.

I use qemu-0.15.1 configured with the following parameter:

./configure --disable-xen --enable-kvm --enable-io-thread 
--enable-vnc-thread --disable-darwin-user --disable-bsd-user 
--target-list=i386-softmmu

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