Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

Davide Libenzi
2007-03-01T19:19:36Z

On Thu, 1 Mar 2007, Ingo Molnar wrote:

>
> * Evgeniy Polyakov <johnpol@2ka.mipt.ru> wrote:
>
> > I posted kevent/epoll benchmarks and related design issues too many
> > times both with handmade applications (which might be broken as hell)
> > and popular open-source servers to repeat them again.
>
> numbers are crutial here - and given the epoll bugs in the evserver code
> that we found, do you have updated evserver benchmark results that
> compare epoll to kevent? I'm wondering why epoll has half the speed of
> kevent in those measurements - i suspect some possible benchmarking bug.
> The queueing model of epoll and kevent is roughly comparable, both do
> only a constant number of steps to serve one particular request,
> regardless of how many pending connections/requests there are. What is
> the CPU utilization of the server system during an epoll test, and what
> is the CPU utilization during a kevent test? 100% utilized in both
> cases?

With 8K concurrent (live) connections, we may also want to try with the v3
version of the epoll-event-loops-diet patch ;)

- Davide