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Date: Tue, 22 Oct 2002 11:18:20 -0700 (PDT)
From: Davide Libenzi <davidel@xmailserver.org>
X-X-Sender: davide@blue1.dev.mcafeelabs.com
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
cc: Mark Mielke <mark@mark.mielke.cc>,
       "Charles 'Buck' Krasic" <krasic@acm.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       linux-aio <linux-aio@kvack.org>
Subject: Re: epoll (was Re: [PATCH] async poll for 2.5)
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On 22 Oct 2002, Alan Cox wrote:

> On Tue, 2002-10-22 at 18:47, Davide Libenzi wrote:
> > Since the sys_epoll ( and /dev/epoll ) fd support standard polling, you
> > can mix sys_epoll handling with other methods like poll() and the AIO's
> > POLL function when it'll be ready. For example, for devices that sys_epoll
> > intentionally does not support, you can use a method like :
>
> The more important question is why do you need epoll. asynchronous I/O
> completions setting a list of futexes can already be made to do the job
> and is much more flexible.

Alan, could you provide a code snipped to show how easy it is and how well
it fits a 1:N ( one task/thread , N connections ) architecture ? And
looking at Ben's presentation about benchmarks ( and for pipe's ), you'll
discover that both poll() and AIO are "a little bit slower" than
sys_epoll. Anyway I do not want anything superflous added to the kernel
w/out reason, that's why, beside the Ben's presentation, there're curretly
people benchmarking existing solutions.




- Davide


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