[Qemu-devel] Again about SMP-host supporting

[Qemu-devel] Again about SMP-host supporting

[Георгий Войт]

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At first:
Dear Developers!!! You make great and very usable solution! Very big
thx!!!!!!!!!!!!
So:
  I have a question:
        is there in roadmap/TODO some plans about old (or not very old)
SMP-hosts supporting? I mean - will qemu work not only on one core/CPU
without HW acceleration (kvm) ??? Can you make for each virtual CPU
standalone qemu thread?  1 VurtualCPU - 1 qemu host thread; 2 VurtualCPU - 2
qemu host threads; etc ? I have P3 SMP machine, so it without intel VT
technology on each CPU, so i can run qemu only on one CPU and KVM module
can't be inseted...  :(
          So, could you say me something about it?
                                                                   George.

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[Qemu-devel] Re: Again about SMP-host supporting

[Георгий Войт]

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2008/6/19 Георгий Войт <goshila@gmail.com>:

> At first:
> Dear Developers!!! You make great and very usable solution! Very big
> thx!!!!!!!!!!!!
> So:
>   I have a question:
>         is there in roadmap/TODO some plans about old (or not very old)
> SMP-hosts supporting? I mean - will qemu work not only on one core/CPU
> without HW acceleration (like kvm) ??? Can you make for each virtual CPU
> standalone qemu thread?  1 VurtualCPU - 1 qemu host thread; 2 VurtualCPU - 2
> qemu host threads; etc ? I have P3 SMP machine, so it without intel VT
> technology on each CPU, so i can run qemu only on one CPU and KVM module
> can't be inserted...  :(
>           So, could you say me something about it?
>                                                                    George.
>
                  COULD SOMEONE SAY ME SOMETHING ABOUT IT?

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Re: [Qemu-devel] Re: Again about SMP-host supporting

[Andreas Färber]

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Георгий,

Am 22.06.2008 um 10:23 schrieb Георгий Войт:

> 2008/6/19 Георгий Войт <goshila@gmail.com>:
>         is there in roadmap/TODO some plans about old (or not very  
> old) SMP-hosts supporting? I mean - will qemu work not only on one  
> core/CPU without HW acceleration (like kvm) ??? Can you make for  
> each virtual CPU standalone qemu thread?  1 VurtualCPU - 1 qemu host  
> thread; 2 VurtualCPU - 2 qemu host threads; etc ? I have P3 SMP  
> machine, so it without intel VT technology on each CPU, so i can run  
> qemu only on one CPU and KVM module can't be inserted...  :(
>           So, could you say me something about it?
>                                                                     
> George.
>                   COULD SOMEONE SAY ME SOMETHING ABOUT IT?

Writing all-caps won't make the devs in the know more responsive to  
such a general question.

Of course in theory it can be done. The problem is that it requires  
synchronization between the threads, and the previous attempts to do  
this reportedly resulted in code slower than the current single- 
threaded version. See the list archives for details.

If you have a good idea to tackle this, feel free to contribute a patch.

As for the emulation speed, if you're running Linux maybe you can use  
the kqemu module.

Andreas

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[Qemu-devel] Re: Again about SMP-host supporting

[Георгий Войт]

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22 июня 2008 г. 12:23 пользователь Георгий Войт <goshila@gmail.com> написал:

>
>
> 2008/6/19 Георгий Войт <goshila@gmail.com>:
>
>> At first:
>> Dear Developers!!! You make great and very usable solution! Very big
>> thx!!!!!!!!!!!!
>> So:
>>   I have a question:
>>         is there in roadmap/TODO some plans about old (or not very old)
>> SMP-hosts supporting? I mean - will qemu work not only on one core/CPU
>> without HW acceleration (like kvm) ??? Can you make for each virtual CPU
>> standalone qemu thread?  1 VurtualCPU - 1 qemu host thread; 2 VurtualCPU - 2
>> qemu host threads; etc ? I have P3 SMP machine, so it without intel VT
>> technology on each CPU, so i can run qemu only on one CPU and KVM module
>> can't be inserted...  :(
>>           So, could you say me something about it?
>>                                                                    George.
>>
>
> Writing all-caps won't make the devs in the know more responsive to such a
> general question.
>
> Of course in theory it can be done. The problem is that it requires
> synchronization between the threads, and the previous attempts to do this
> reportedly resulted in code slower than the current single-threaded
> version. See the list archives for details.
>
> If you have a good idea to tackle this, feel free to contribute a patch.
>
> As for the emulation speed, if you're running Linux maybe you can use the
> kqemu module.
>
> Andreas
>

Ok Andreas, thank you very much for your reply =) Sorry about writing all in
caps-lock, i just thinking, that nobody couldn't answer to me... By the way,
i wish to use windows as guest, so can't using kqemu acceleration =(   I
will try to find in archive version with smp support =) I have SMP with more
than 2 CPU's without HW acceleration support, so , maybe this version will
be more speedly, then single-threaded version?

      George.

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Re: [Qemu-devel] Re: Again about SMP-host supporting

[Andreas Färber]

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Am 22.06.2008 um 20:30 schrieb Георгий Войт:

> 22 июня 2008 г. 12:23 пользователь Георгий  
> Войт <goshila@gmail.com> написал:
>
>
> 2008/6/19 Георгий Войт <goshila@gmail.com>:
> As for the emulation speed, if you're running Linux maybe you can  
> use the kqemu module.
>
> Andreas
>
> i wish to use windows as guest, so can't using kqemu acceleration =(

Sorry I was unclear, it depends on the host OS, not on the guest.  
Linux, Solaris, FreeBSD should work as kqemu hosts, though I have no  
experience with it.

Andreas

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[Qemu-devel] Re: Again about SMP-host supporting

[Георгий Войт]

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>
> Andreas
>>
> As for the emulation speed, if you're running Linux maybe you can use the
>> kqemu module.
>>
>
> Andreas
>
> i wish to use windows as guest, so can't using kqemu acceleration =(
>
> Sorry I was unclear, it depends on the host OS, not on the guest. Linux,
> Solaris, FreeBSD should work as kqemu hosts, though I have no experience
> with it.
> Andreas
>

Ok Andreas, i use Linux as host and windows as guest, but as i understand,
kqemu module work only if it inserted on both (host and guest) OS's... So, i
tried to use kqemu only on host Linux, but no result... maybe it work on
seconds faster, but it's thread still uses only one CPU, or , as i saw in
htop, it's single thread jump between CPU's.... Now i will writing mail to
Paul Brook, he makes a prototype of qemu with multi-thread support.
           George.

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