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

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Message-ID: <20070301101924.GB14603@elte.hu>
Date:	Thu, 1 Mar 2007 11:19:24 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pavel Machek <pavel@....cz>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Theodore Tso <tytso@....edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>,
	linux-kernel@...r.kernel.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>,
	Zach Brown <zach.brown@...cle.com>,
	"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: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3


* Pavel Machek <pavel@....cz> wrote:

> > Threadlets behave much worse without event driven model, events can 
> > behave worse without backed threads, they are mutually compensating.
> 
> I think Ingo demonstrated unoptimized threadlets to be within 5% to 
> the speed of kevent. [...]

that was epoll not kevent, but yeah. To me the biggest question is, how 
much improvement does kevent bring relative to epoll? Epoll is a pretty 
good event queueing API, and it covers all the event sources today. It 
is also O(1) throughout, so i dont really understand how it could only 
achieve half the speed of kevent in the evserver_epoll/kevent.c 
benchmark. We need to understand that first.

	Ingo
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