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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 (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 

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