Re: [PATCH 18/21] Remove host_alarm_timer hacks.

Anthony Liguori
2009-04-30T13:37:03Z

Avi Kivity wrote:
> Anthony Liguori wrote:
>> In modern KVM, the IO thread is capable of interrupting the CPU
>> whenever it needs to process IO. Therefore this "problem" no longer
>> exists.
>>
>
> It would still be good to verify that the problem no longer exists.
> This is not a cosmetic change; some testing is needed to verify it
> doesn't introduce new latencies.
>

N.B. dynticks is the preferred timer in QEMU on Linux. To even hit this
code path, you'd have to use an explicit -clock hpet or -clock rtc. I
don't have an hpet on my laptop and -clock rtc boots just as fast as it
did before.

Do we really care about optimizing latency with -clock rtc though?

--
Regards,

Anthony Liguori