Re: [Qemu-ppc] PPC System emulation optimization

[TRUONG Duc]

Classification: Open

Hi Alex,

 

We are trying to emulate a PPC server with a custom kernel, rootfs and application software.  Our PPC server is actually a quadcore Freescale PPC, but I was not able to successfully run the MPC8544DS machine with qemu PPC system emulator.  So instead I recompiled our kernel for g3beige and use our rootfs and application software to run the qemu PPC system emulator.  Since we have custom kernel and rootfs that the application software depends on, I don’t think that I can use the Linux-user target mode in QEMU.

 

In your opinion, how difficult would it be to modify the QEMU PPC system emulator to perform faster?  My company would like to identify the effort needed and the right persons that we can contact about this work.

 

Thanks,

 

Duc Truong

 

[@@OPEN@@]

This email was classified by TRUONG Duc on Tuesday, October 29, 2013 3:25:06 PM.

From: Alexander Graf [mailto:address@hidden
Sent: Tuesday, October 29, 2013 2:58 PM
To: TRUONG Duc
Cc: address@hidden; VARATHARAJAN Sivaraman
Subject: Re: [Qemu-ppc] PPC System emulation optimization

 

Hi Duc,

Am 29.10.2013 um 14:45 schrieb TRUONG Duc <address@hidden>:

Classification: Open

Hi,

 

We are using the qemu PPC system emulator with machine type g3beige to run an image with Fedora for PPC and our custom application software (cross-compiled for ppc).  Our host machine is a x86 Linux with i7 CPU.  Our application software has many processes and threads which makes the emulator run very slow.  Currently we are using QEMU version 1.3.0, but I also tried the newer versions (1.6.1) and have not noticed any significant performance improvements.

 

Are there any areas where the qemu PPC system emulator can be optimized to run faster?  Alternatively, is it possible to have the qemu PPC system emulator utilize more one host CPU core?  Currently, the qemu PPC system emulator uses 100% of a single host core when running our application software.  It seems like the emulator could run faster if it were to utilize all the host CPU cores.

 

Not easily with the system emulator. However, it sounds as for your use case you could just as well ise the Linux-user target mode of QEMU.

 

Have you tried that one instead yet?

 

 

Alex

 

 

Thanks,

 

Duc Truong

[@@OPEN@@]

This email was classified by TRUONG Duc on Tuesday, October 29, 2013 2:46:18 PM.