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[Qemu-devel] Re: [kvm-devel] [PATCH 0/4] Rework alarm timer infrastrucur


From: Avi Kivity
Subject: [Qemu-devel] Re: [kvm-devel] [PATCH 0/4] Rework alarm timer infrastrucure - take2
Date: Sun, 19 Aug 2007 22:31:26 +0300
User-agent: Thunderbird 2.0.0.5 (X11/20070719)

Luca wrote:
> On 8/19/07, Luca Tettamanti <address@hidden> wrote:
>   
>> +static uint64_t qemu_next_deadline(void) {
>> +    uint64_t nearest_delta_us = ULLONG_MAX;
>> +    uint64_t vmdelta_us;
>>     
>
> Hum, I introduced a bug here... those vars should be signed.
>
> On the overhead introduced: how do you measure it?
>
>   

Run a 100Hz guest, measure cpu usage using something accurate like
cyclesoak, with and without dynticks, with and without kvm.


-- 
Do not meddle in the internals of kernels, for they are subtle and quick to 
panic.





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