Re: [Qemu-devel] [Qemu-ppc] [PATCH v2 0/3] Enable MTTCG on PPC64

[luigi burdo]

Hi Alex,

>Have you declared the memory ordering for the guest?

Nope didnt know was necessary i just add the standard -m 2047


>See ca759f9e387db87e1719911f019bc60c74be9ed8 for an example.

watching it about

Thanks
Luigi

Re: [Qemu-devel] [Qemu-ppc] [PATCH v2 0/3] Enable MTTCG on PPC64

[Nikunj A Dadhania]

Alex Bennée  writes:

> Nikunj A Dadhania  writes:
>
>> Alex Bennée  writes:
>>
>>> luigi burdo  writes:
>>>
 Hi David and Nikuji,

 can i suggest to remove the message:


 Guest not yet converted to MTTCG - you may get unexpected results
 where the mttcg is enabled?
>>>
>>> Have you declared the memory ordering for the guest?
>>
>> No, I havent done that yet, will send a patch.
>
> You also need to update configure so mttcg="yes" (resulting in
> TARGET_SUPPORTS_MTTCG being set for the build).

Yes, I have that patch for ppc64, will send it to the list.

Regards
Nikunj

Re: [Qemu-devel] [Qemu-ppc] [PATCH v2 0/3] Enable MTTCG on PPC64

[Alex Bennée]

Nikunj A Dadhania  writes:

> Alex Bennée  writes:
>
>> luigi burdo  writes:
>>
>>> Hi David and Nikuji,
>>>
>>> can i suggest to remove the message:
>>>
>>>
>>> Guest not yet converted to MTTCG - you may get unexpected results
>>> where the mttcg is enabled?
>>
>> Have you declared the memory ordering for the guest?
>
> No, I havent done that yet, will send a patch.

You also need to update configure so mttcg="yes" (resulting in
TARGET_SUPPORTS_MTTCG being set for the build).
>
>>> another thing im finding  is this message
>>> Guest expects a stronger memory ordering than the host provides
>>> This may cause strange/hard to debug errors
>>
>> See ca759f9e387db87e1719911f019bc60c74be9ed8 for an example.
>
> Regards
> Nikunj


--
Alex Bennée

Re: [Qemu-devel] [Qemu-ppc] [PATCH v2 0/3] Enable MTTCG on PPC64

[Nikunj A Dadhania]

Alex Bennée  writes:

> luigi burdo  writes:
>
>> Hi David and Nikuji,
>>
>> can i suggest to remove the message:
>>
>>
>> Guest not yet converted to MTTCG - you may get unexpected results
>> where the mttcg is enabled?
>
> Have you declared the memory ordering for the guest?

No, I havent done that yet, will send a patch.

>> another thing im finding  is this message
>> Guest expects a stronger memory ordering than the host provides
>> This may cause strange/hard to debug errors
>
> See ca759f9e387db87e1719911f019bc60c74be9ed8 for an example.

Regards
Nikunj

Re: [Qemu-devel] [Qemu-ppc] [PATCH v2 0/3] Enable MTTCG on PPC64

[Alex Bennée]

luigi burdo  writes:

> Hi David and Nikuji,
>
> can i suggest to remove the message:
>
>
> Guest not yet converted to MTTCG - you may get unexpected results
> where the mttcg is enabled?

Have you declared the memory ordering for the guest?

>
> another thing im finding  is this message
> Guest expects a stronger memory ordering than the host provides
> This may cause strange/hard to debug errors

See ca759f9e387db87e1719911f019bc60c74be9ed8 for an example.

>
>
> I have 8 gb on my machine and this message come if i gave 512mb on the guest 
> too.
>
> Is possible know where the mttcg is already enabled?
>
> i see on x86,i386,arm too if i set thread=multy the qemu start using the 
> other host cores is on this guest system enabled?
>
> if yes i have the same messages of ppc64 too :
>
> Guest not yet converted to MTTCG - you may get unexpected results
>
> and
>
> Guest expects a stronger memory ordering than the host provides
> This may cause strange/hard to debug errors
>
>
> Ciao
>
> Luigi
>
>
> Applied to ppc-for-2.10.  Anyone object to that for 2/3, which isn't
> within ppc code?


--
Alex Bennée

Re: [Qemu-devel] [Qemu-ppc] [PATCH v2 0/3] Enable MTTCG on PPC64

[Alex Bennée]

luigi burdo  writes:

> Hi, on info is mttcg using an amouth of ram for cpu caching and
> translating operations like was did in past by emulators like
> virtualpc,realpc, bluelabel or softwindows?

It's a fixed buffer. You can see if it being flushed by running:

  info jit

On the QEMU monitor console.

>
> in case of yes is possible increase it from the command line?
>
> Thanks
>
> Luigi


--
Alex Bennée

Re: [Qemu-devel] [Qemu-ppc] [PATCH v2 0/3] Enable MTTCG on PPC64

[luigi burdo]

Hi David and Nikuji,

can i suggest to remove the message:


Guest not yet converted to MTTCG - you may get unexpected results
where the mttcg is enabled?

another thing im finding  is this message
Guest expects a stronger memory ordering than the host provides
This may cause strange/hard to debug errors


I have 8 gb on my machine and this message come if i gave 512mb on the guest 
too.

Is possible know where the mttcg is already enabled?

i see on x86,i386,arm too if i set thread=multy the qemu start using the other 
host cores is on this guest system enabled?

if yes i have the same messages of ppc64 too :

Guest not yet converted to MTTCG - you may get unexpected results

and

Guest expects a stronger memory ordering than the host provides
This may cause strange/hard to debug errors


Ciao

Luigi


Applied to ppc-for-2.10.  Anyone object to that for 2/3, which isn't
within ppc code?

--
David Gibson

Re: [Qemu-devel] [Qemu-ppc] [PATCH v2 0/3] Enable MTTCG on PPC64

[luigi burdo]

Hi, on info is mttcg using an amouth of ram for cpu caching and translating 
operations like was did in past by emulators like virtualpc,realpc, bluelabel 
or softwindows?

in case of yes is possible increase it from the command line?

Thanks

Luigi

Re: [Qemu-devel] [Qemu-ppc] [PATCH v2 0/3] Enable MTTCG on PPC64

[luigi burdo]

Hi i dint made much tests,

but for sure all is faster compared one thread only.

Fore sure tcg need to be optimized (in all emulated architectures) compared 
some old commercial emulators but all is better than before.

I will made more tests tomorrow and report.

ciao

Luigi


Do you have any timings? Did the guest run faster?

Re: [Qemu-devel] [Qemu-ppc] [PATCH v2 0/3] Enable MTTCG on PPC64

[luigi burdo]

Tested on PowerMac G5 Quad  and 380% of system load and working on

Fedora 25 PPC64 host and Ubuntu Mate 17.04 guest  (patched the 2.9 rc3)


The machine configuration was this

sudo ./qemu-system-ppc64 -cpu POWER8 -vga none -machine pseries-2.5,usb=off -m 
2G  -smp 4,cores=4,threads=1 -accel tcg,thread=multi  -kerne vmlinuz-append 
root=/dev/sda   -device ich9-ahci,id=ahci   -device ide-drive,drive=disk0 
-drive file=/dev/sda4,if=none,id=disk0   -net nic,model=pcnet -net user 
-soundhw hda  -display sdl -vga virtio


vga virtio working too

here a shot

https://scontent-mxp1-1.xx.fbcdn.net/v/t1.0-9/17796379_10208795258860396_7825547329794577576_n.jpg?oh=526d6ddeb67c817053582d5b9ee56c71=594D7BDF


Thanks

Luigi

Re: [Qemu-devel] [Qemu-ppc] [PATCH v2 0/3] Enable MTTCG on PPC64

[G 3]

On Apr 7, 2017, at 1:49 PM, luigi burdo wrote:


Tested on PowerMac G5 Quad  and 380% of system load and working on
Fedora 25 PPC64 host and Ubuntu Mate 17.04 guest  (patched the 2.9  
rc3)


The machine configuration was this

sudo ./qemu-system-ppc64 -cpu POWER8 -vga none -machine  
pseries-2.5,usb=off -m 2G  -smp 4,cores=4,threads=1 -accel  
tcg,thread=multi  -kerne vmlinuz-append root=/dev/sda   -device  
ich9-ahci,id=ahci   -device ide-drive,drive=disk0 -drive file=/dev/ 
sda4,if=none,id=disk0   -net nic,model=pcnet -net user -soundhw  
hda  -display sdl -vga virtio


vga virtio working too
here a shot
https://scontent-mxp1-1.xx.fbcdn.net/v/ 
t1.0-9/17796379_10208795258860396_7825547329794577576_n.jpg? 
oh=526d6ddeb67c817053582d5b9ee56c71=594D7BDF


Thanks
Luigi


Do you have any timings? Did the guest run faster?