Re: [Qemu-devel] Re: [RFT][PATCH 07/15] qemu_irq: Add IRQ handlers with delivery feedback

[Jan Kiszka]

Blue Swirl wrote:
> On Sat, May 29, 2010 at 10:16 AM, Jan Kiszka <address@hidden> wrote:
>> Blue Swirl wrote:
>>>>>> This is - according to my current understanding - the proposed
>>>>>> alternative architecture:
>>>>>>
>>>>>>                                          .---------------.
>>>>>>                                          | de-coalescing |
>>>>>>                                          |     logic     |
>>>>>>                                          '---------------'
>>>>>>                                                ^   |
>>>>>>                                         period,|   |IRQ
>>>>>>                                       coalesced|   |(or tuned VM clock)
>>>>>>                                        (yes/no)|   v
>>>>>> .-------.              .--------.             .-------.
>>>>>> |  RTC  |-----IRQ----->| router |-----IRQ---->| APIC  |
>>>>>> '-------'              '--------'             '-------'
>>>>>>    |                    ^    |                   ^
>>>>>>    |                    |    |                   |
>>>>>>    '-------period-------'    '------period-------'
>>>>> The period information is already known by the higher level clock
>>>>> management,
>>>> The timer device models program the next event of some qemu-timer. There
>>>> is no tag attached explaining the timer subsystem or anyone else the
>>>> reason behind this programming.
>>> Yes, but why would we care? All timers in the system besides RTC
>>> should be affected likewise, this would in fact be the benefit from
>>> handling the problem at higher level.
>> And how does your equation for calculating the clock slow-down look like?
> 
> How about icount_adjust()?

I would suggest that you implement your ideas now. Please keep us
informed about the progress as this series (and more) depends on a decision.

Jan

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