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From: Eric Dumazet <dada1@cosmosbay.com>
To: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3
Date: Thu, 1 Mar 2007 16:41:27 +0100
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Cc: Ingo Molnar <mingo@elte.hu>, 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>,
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       Suparna Bhattacharya <suparna@in.ibm.com>,
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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...