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

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Message-ID: <20070227171343.GA3956@ucw.cz>
Date:	Tue, 27 Feb 2007 17:13:44 +0000
From:	Pavel Machek <pavel@....cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Ulrich Drepper <drepper@...hat.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>,
	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

Hi!

> > If kernelspace rescheduling is that fast, then please explain me why 
> > userspace one always beats kernel/userspace?
> 
> because 'user space scheduling' makes no sense? I explained my thinking 
> about that in a past mail:
...
>  2) there has been an IO event. The thing is, for IO events we enter the
>     kernel no matter what - and we'll do so for the next 10 years at

..actually, at some point 3D acceleration was done by accessing hw
directly from userspace. OTOH I think we are moving away from that
model, so it is probably irrelevant here.
							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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