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

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Message-ID: <Pine.LNX.4.64.0703011118220.23932@alien.or.mcafeemobile.com>
Date:	Thu, 1 Mar 2007 11:19:30 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Pavel Machek <pavel@....cz>, Theodore Tso <tytso@....edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>,
	Linux Kernel Mailing List <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>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

On Thu, 1 Mar 2007, Ingo Molnar wrote:

> 
> * Evgeniy Polyakov <johnpol@....mipt.ru> wrote:
> 
> > I posted kevent/epoll benchmarks and related design issues too many 
> > times both with handmade applications (which might be broken as hell) 
> > and popular open-source servers to repeat them again.
> 
> numbers are crutial here - and given the epoll bugs in the evserver code 
> that we found, do you have updated evserver benchmark results that 
> compare epoll to kevent? I'm wondering why epoll has half the speed of 
> kevent in those measurements - i suspect some possible benchmarking bug. 
> The queueing model of epoll and kevent is roughly comparable, both do 
> only a constant number of steps to serve one particular request, 
> regardless of how many pending connections/requests there are. What is 
> the CPU utilization of the server system during an epoll test, and what 
> is the CPU utilization during a kevent test? 100% utilized in both 
> cases?

With 8K concurrent (live) connections, we may also want to try with the v3 
version of the epoll-event-loops-diet patch ;)



- Davide


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