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

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Date:	Mon, 26 Feb 2007 09:16:56 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.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>,
	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


* Davide Libenzi <davidel@...ilserver.org> wrote:

> Also, the evtest_kevent_remove call is superfluous with epoll.

it's only used in the error path AFAICS.

but you are right about evserver_epoll/kevent.c incorrectly assuming 
that things wont block in evtest_callback_client(), which, after 
receiving the "there's stuff on the input socket" event does:

	recvmsg(sock),
	fd = open();
	sendfile(sock, fd)
	close(fd);

while evserver_threadlet.c, even this naive implementation, does not 
assume that we wont block in that function.

> In any case, comparing epoll/kevent with 100K active sessions, against 
> threadlets, is not exactly a fair/appropriate test for it.

fully agreed.

	Ingo
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