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

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Message-ID: <20070301123423.GA10738@elte.hu>
Date:	Thu, 1 Mar 2007 13:34:23 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	Pavel Machek <pavel@....cz>, 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


* Evgeniy Polyakov <johnpol@....mipt.ru> wrote:

> Document Length:        3521 bytes

> Concurrency Level:      8000
> Time taken for tests:   16.686737 seconds
> Complete requests:      80000
> Failed requests:        0
> Write errors:           0
> Total transferred:      309760000 bytes
> HTML transferred:       281680000 bytes
> Requests per second:    4794.23 [#/sec] (mean)

> Concurrency Level:      8000
> Time taken for tests:   12.366775 seconds
> Complete requests:      80000
> Failed requests:        0
> Write errors:           0
> Total transferred:      317047104 bytes
> HTML transferred:       288306522 bytes
> Requests per second:    6468.95 [#/sec] (mean)

i'm wondering - how can the 'Total transferred' and 'HTML transferred' 
numbers be different?

Since document length is 3521, and the number of requests is 80000, the 
correct 'HTML transferred' is 281680000 - which is the epoll result. The 
kevent result shows more bytes transferred, which suggests that the 
kevent loop is probably incorrect somewhere.

this might be some benign thing, but the /first/ thing you /have to/ do 
before claiming that 'kevent is 25% faster than epoll' is to make sure 
the results are totally reliable.

	Ingo
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