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

Avi Kivity
2009-04-30T15:46:08Z

Anthony Liguori wrote:
> 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.

I'll apply this and see what happens.

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

People still run kvm on RHEL 5 (or cheap clones thereof), aren't they
affected?

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