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Date: Thu, 1 Mar 2007 13:34:23 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Cc: Pavel Machek <pavel@ucw.cz>, Theodore Tso <tytso@mit.edu>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Ulrich Drepper <drepper@redhat.com>, linux-kernel@vger.kernel.org,
       Arjan van de Ven <arjan@infradead.org>,
       Christoph Hellwig <hch@infradead.org>, Andrew Morton <akpm@zip.com.au>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>, Zach Brown <zach.brown@oracle.com>,
       "David S. Miller" <davem@davemloft.net>,
       Suparna Bhattacharya <suparna@in.ibm.com>,
       Davide Libenzi <davidel@xmailserver.org>,
       Jens Axboe <jens.axboe@oracle.com>,
       Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3
Message-ID: <20070301123423.GA10738@elte.hu>
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* Evgeniy Polyakov <johnpol@2ka.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