linux-kernel - Re: [patch 05/11] syslets: core code

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Message-Id: <200702152026.08541.dada1@cosmosbay.com>
Date:	Thu, 15 Feb 2007 20:26:08 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	bert hubert <bert.hubert@...herlabs.nl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Ingo Molnar <mingo@...e.hu>,
	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>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 05/11] syslets: core code

On Thursday 15 February 2007 19:46, bert hubert wrote:

> Both 1 and 2 are currently limiting factors when I enter the 100kqps domain
> of name serving. This doesn't mean the rest of my code is as tight as it
> could be, but I spend a significant portion of time in the kernel even at
> moderate (10kqps effective) loads, even though I already use epoll. A busy
> PowerDNS recursor typically spends 25% to 50% of its time on 'sy' load.

Well, I guess in your workload most of system overhead is because of sockets 
creation/destruction, UDP/IP stack work, nic driver, interrupts... I really 
doubt async_io could help you... Do you have some oprofile results to share 
with us ?
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