On Wed, Sep 5, 2012 at 4:10 AM, Kazu Yamamoto
<kazu@iij.ad.jp> wrote:
Bryan,
>> To my experience, the assumption 2) is not right. getttimeofday()
>> is implemented in user land in Linux 3 but it is a system call
>> in Linux 2.
>
> Just a nit: your history here is not correct. gettimeofday has been
> implemented as a vsyscall for a long time, maybe 5 years. And while it's
> faster than int 0x80, it's not that much faster: 2x or so on modern hardware.
Thank you for your correction.
To whose who are interested in, additional information can be found
from:
http://en.chys.info/2009/01/linux%E2%80%99s-vsyscall/
Anyway, I believe we should avoid gettimeofday as much as possible
to implement fast servers.