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

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Date:	Tue, 27 Feb 2007 16:14:29 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	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

On Tue, Feb 27, 2007 at 01:34:21PM +0100, Ingo Molnar (mingo@...e.hu) wrote:
> based servers. The measurements so far have shown that the absolute 
> worst-case threading server performance is at around 60% of that of 
> non-context-switching servers - and even that level is reached 
> gradually, leaving time for action for the server owner. While with 
> fully event based servers there are mostly only two modes of 
> performance: 100% performance and near-0% performance: total breakdown.

Let's live in piece! :) 
I always agreed that they should be used together - event-based rings 
of IO requests, if request happens to block (which should be avaided 
as much as possible), then it continues on behalf of sleeping thread.

> 	Ingo

-- 
	Evgeniy Polyakov
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