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

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Message-Id: <200703011641.28064.dada1@cosmosbay.com>
Date:	Thu, 1 Mar 2007 16:41:27 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	Ingo Molnar <mingo@...e.hu>, 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 Thursday 01 March 2007 16:32, Eric Dumazet wrote:
> On Thursday 01 March 2007 16:23, Evgeniy Polyakov wrote:
> > They are there, since ab runs only 50k requests.
> > If I change it to something noticebly more than 50/80k, ab crashes:
> > # ab -c8000 -t 600 -n800000000 http://192.168.0.48/
> > This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
> > Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
> > Copyright 2006 The Apache Software Foundation, http://www.apache.org/
> >
> > Benchmarking 192.168.0.48 (be patient)
> > Segmentation fault
> >
> > Are there any other tool suitable for such loads?
> > I only tested httperf (which is worse, since it uses poll/select) and
> > 'ab'.
> >
> > Btw, host machine runs 100% too, so it is possible that client side is
> > broken (too).
>
> I have similar problems here, ab test just doesnt complete...
>
> I am still investigating with strace and tcpdump.

OK... I found it.

I had to loop on accept() :

        for (i=0; i<num; ++i) {
                if (event[i].data.fd == main_server_s) {
                        do {
                                err = evtest_callback_main(event[i].data.fd);
                                } while (err != -1);
                        }
                else
                        err = evtest_callback_client(event[i].data.fd);
        }

Or else we can miss an event forever...
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