Re: [Qemu-devel] QEMU and Real Time OS

2015-02-02 Thread Marcelo Tosatti
On Fri, Jan 30, 2015 at 08:37:47AM +0100, Jan Kiszka wrote: > On 2015-01-30 00:06, Paolo Bonzini wrote: > > > > > > On 29/01/2015 20:37, Marc Marí wrote: > >> Is this an expected behaviour? I can't see why. > >> > >> I'd like to know if there is a certain reason why it doesn't work. Or > >> if it

Re: [Qemu-devel] QEMU and Real Time OS

2015-01-30 Thread Jan Kiszka
On 2015-01-30 11:36, Frederic Konrad wrote: > On 30/01/2015 11:26, Marc Marí wrote: >> El Fri, 30 Jan 2015 08:37:47 +0100 >> Jan Kiszka escribió: >>> On 2015-01-30 00:06, Paolo Bonzini wrote: On 29/01/2015 20:37, Marc Marí wrote: > Is this an expected behaviour? I can't see why.

Re: [Qemu-devel] QEMU and Real Time OS

2015-01-30 Thread Marc Marí
El Fri, 30 Jan 2015 11:36:37 +0100 Frederic Konrad escribió: > On 30/01/2015 11:26, Marc Marí wrote: > > El Fri, 30 Jan 2015 08:37:47 +0100 > > Jan Kiszka escribió: > >> On 2015-01-30 00:06, Paolo Bonzini wrote: > >>> > >>> On 29/01/2015 20:37, Marc Marí wrote: > Is this an expected behaviou

Re: [Qemu-devel] QEMU and Real Time OS

2015-01-30 Thread Frederic Konrad
On 30/01/2015 11:26, Marc Marí wrote: El Fri, 30 Jan 2015 08:37:47 +0100 Jan Kiszka escribió: On 2015-01-30 00:06, Paolo Bonzini wrote: On 29/01/2015 20:37, Marc Marí wrote: Is this an expected behaviour? I can't see why. I'd like to know if there is a certain reason why it doesn't work. Or

Re: [Qemu-devel] QEMU and Real Time OS

2015-01-30 Thread Marc Marí
El Fri, 30 Jan 2015 08:37:47 +0100 Jan Kiszka escribió: > On 2015-01-30 00:06, Paolo Bonzini wrote: > > > > > > On 29/01/2015 20:37, Marc Marí wrote: > >> Is this an expected behaviour? I can't see why. > >> > >> I'd like to know if there is a certain reason why it doesn't work. > >> Or if it sh

Re: [Qemu-devel] QEMU and Real Time OS

2015-01-29 Thread Jan Kiszka
On 2015-01-30 00:06, Paolo Bonzini wrote: > > > On 29/01/2015 20:37, Marc Marí wrote: >> Is this an expected behaviour? I can't see why. >> >> I'd like to know if there is a certain reason why it doesn't work. Or >> if it should work and the problem is too much I/O overhead. Or any >> other hint

Re: [Qemu-devel] QEMU and Real Time OS

2015-01-29 Thread Paolo Bonzini
On 29/01/2015 20:37, Marc Marí wrote: > Is this an expected behaviour? I can't see why. > > I'd like to know if there is a certain reason why it doesn't work. Or > if it should work and the problem is too much I/O overhead. Or any > other hint to understand it. It is due to latencies in the hos

[Qemu-devel] QEMU and Real Time OS

2015-01-29 Thread Marc Marí
Hi I tried to run a Linux Kernel with Preempt RT patch on a QEMU emulated machine using TCG (ARM guest, x86_64 guest). I expected the guest to have high latencies, but more or less constant. But I found, using cyclictest, a lot of randomness and a lot of difference between the average and the max