linux-kernel - Re: Syslets, Threadlets, generic AIO support, v6

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Message-ID: <465D286E.2080807@redhat.com>
Date:	Wed, 30 May 2007 00:31:58 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Jeff Garzik <jeff@...zik.org>, Zach Brown <zach.brown@...cle.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Syslets, Threadlets, generic AIO support, v6

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Ingo Molnar wrote:
> 3 months ago i verified the published kevent vs. epoll benchmark and 
> found that benchmark to be fatally flawed. When i redid it properly 
> kevent showed no significant advantage over epoll.

I'm not going to judge your tests but saying there are no significant
advantages is too one-sided.  There is one huge advantage: the
interface.  A memory-based interface is simply the best form.  File
descriptors are a resource the runtime cannot transparently consume.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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