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

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Date:	Sun, 25 Feb 2007 20:44:38 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	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>,
	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 Sun, Feb 25, 2007 at 06:23:38PM +0100, Ingo Molnar (mingo@...e.hu) wrote:
> 
> * Evgeniy Polyakov <johnpol@....mipt.ru> wrote:
> 
> > On Wed, Feb 21, 2007 at 10:13:55PM +0100, Ingo Molnar (mingo@...e.hu) wrote:
> > > this is the v3 release of the syslet/threadlet subsystem:
> > > 
> > >    http://redhat.com/~mingo/syslet-patches/
> > 
> > There is no %xgs.
> > 
> > --- ./arch/i386/kernel/process.c~	2007-02-24 22:56:14.000000000 +0300
> > +++ ./arch/i386/kernel/process.c	2007-02-24 22:53:19.000000000 +0300
> > @@ -426,7 +426,6 @@
> >  
> >  	regs.xds = __USER_DS;
> >  	regs.xes = __USER_DS;
> > -	regs.xgs = __KERNEL_PDA;
> 
> hm, what tree are you using as a base? The syslet patches are against 
> v2.6.20 at the moment. (the x86 PDA changes will probably interfere with 
> it on v2.6.21-rc1-ish kernels) Note that otherwise the syslet/threadlet 
> patches are for x86 only at the moment (as i mentioned in the 
> announcement), and the generic code itself contains some occasional 
> x86-ishms as well. (None of the concepts are x86-specific though - 
> multi-stack architectures should work just as well as RISC-ish CPUs.)

It is rc1 - and crashes.
I test on i386 via epia (the only machine which runs x86 right now).

If there will not be any new patches, I will create 2.6.20 test tree
tomorrow.

> if you create a threadlet based test-webserver, could you please do a 
> comparable kevents implementation as well? I.e. same HTTP parser (or 
> non-parser, as usually the case is with prototypes ;). Best would be 
> something that one could trigger between threadlet and kevent mode, 
> using the same binary :-)

Ok, I will create such a monster tomorrow :)

I will use the same base for threadlet as for kevent/epoll - there is no
parser, just sendfile() of the static file which contains http header
and actual page.

threadlet1 {
	accept() 
	create threadlet2 {
		send data
	}
}

Is above scheme correct for threadlet scenario?

But note, that on my athlon64 3500 test machine kevent is about 7900
requests per second compared to 4000+ epoll, so expect a challenge.
lighhtpd is about the same 4000 requests per second though, since it can
not be easily optimized for kevents.

> 	Ingo

-- 
	Evgeniy Polyakov
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