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

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Message-ID: <20070301142430.GA25424@2ka.mipt.ru>
Date:	Thu, 1 Mar 2007 17:24:31 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Ingo Molnar <mingo@...e.hu>
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

On Thu, Mar 01, 2007 at 02:32:42PM +0100, Ingo Molnar (mingo@...e.hu) wrote:
> 
> * Evgeniy Polyakov <johnpol@....mipt.ru> wrote:
> 
> > [...] that is why number for kevent is higher - it uses edge-triggered 
> > handler (which you asked to remove from epoll), [...]
> 
> no - i did not 'ask' it to be removed from epoll, i only pointed out 
> that with edge-triggered the results were highly unreliable here and 
> that with level-triggered it worked better. Just to make sure: if you 
> put back edge-triggered into evserver_epoll.c, do you get the same 
> numbers, and is CPU utilization still the same 98-100%?

No.
_Now_ it is about 1500-2000 req/sec with 10-20% CPU utilization. 
Number of 'Total transferred' and 'HTML transferred' does
not equal to 80000 multiplied by size of the page.

That are strange tests actually - I managed to get 9000 requests per
second from epoll server (only once!) and 8900 from kevent (two times
only), sometimes they both drop down to 2300-2700 req/s.

> 	Ingo

-- 
	Evgeniy Polyakov
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