Re: [PATCH v2 -tip 1/5] x86, MSI: Support multiple MSIs in presense of IRQ remapping

2012-09-04 Thread Alexander Gordeev
On Mon, Sep 03, 2012 at 11:53:39AM -0700, Yinghai Lu wrote: > On Mon, Sep 3, 2012 at 2:17 AM, Alexander Gordeev wrote: > You may update create_irq_nr to be __create_irq_nr, and it could take > extra count. > > and later have create_irq_nr to be __create_irq_nr(,1,) > and create_irqs to be

Re: [PATCH v2 -tip 1/5] x86, MSI: Support multiple MSIs in presense of IRQ remapping

2012-09-04 Thread Alexander Gordeev
On Mon, Sep 03, 2012 at 11:53:39AM -0700, Yinghai Lu wrote: On Mon, Sep 3, 2012 at 2:17 AM, Alexander Gordeev agord...@redhat.com wrote: You may update create_irq_nr to be __create_irq_nr, and it could take extra count. and later have create_irq_nr to be __create_irq_nr(,1,) and create_irqs

Re: [PATCH v2 -tip 1/5] x86, MSI: Support multiple MSIs in presense of IRQ remapping

2012-09-03 Thread Yinghai Lu
On Mon, Sep 3, 2012 at 2:17 AM, Alexander Gordeev wrote: > The MSI specification has several constraints in comparison with MSI-X, > most notable of them is the inability to configure MSIs independently. > As a result, it is impossible to dispatch interrupts from different > queues to different

[PATCH v2 -tip 1/5] x86, MSI: Support multiple MSIs in presense of IRQ remapping

2012-09-03 Thread Alexander Gordeev
The MSI specification has several constraints in comparison with MSI-X, most notable of them is the inability to configure MSIs independently. As a result, it is impossible to dispatch interrupts from different queues to different CPUs. This is largely devalues the support of multiple MSIs in SMP

[PATCH v2 -tip 1/5] x86, MSI: Support multiple MSIs in presense of IRQ remapping

2012-09-03 Thread Alexander Gordeev
The MSI specification has several constraints in comparison with MSI-X, most notable of them is the inability to configure MSIs independently. As a result, it is impossible to dispatch interrupts from different queues to different CPUs. This is largely devalues the support of multiple MSIs in SMP

Re: [PATCH v2 -tip 1/5] x86, MSI: Support multiple MSIs in presense of IRQ remapping

2012-09-03 Thread Yinghai Lu
On Mon, Sep 3, 2012 at 2:17 AM, Alexander Gordeev agord...@redhat.com wrote: The MSI specification has several constraints in comparison with MSI-X, most notable of them is the inability to configure MSIs independently. As a result, it is impossible to dispatch interrupts from different queues