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Message-ID: <3D88AA12.9D52C892@kegel.com>
Date: Wed, 18 Sep 2002 09:30:10 -0700
From: Dan Kegel <dank@kegel.com>
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To: Ulrich Drepper <drepper@redhat.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: Hardware limits on numbers of threads?
References: <3D88208E.8545AAA2@kegel.com> <3D882500.2000105@redhat.com>
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Ulrich Drepper wrote:
> > http://people.redhat.com/drepper/glibcthreads.html says:
> >
> >>Hardware restrictions put hard limits on the number of
> >>threads the kernel can support for each process. ...
> >
> > Is this true?  Where does the limit come from?
> 
> This was and is true with the kernel before 2.5.3<mumble> when Ingo
> introduced TLS support since the thread specific data had to be
> addressed via LDT entries and the LDT holds at most 8192 entries.  The
> GDT based solution now implemented in the kernel has no such limitation
> and the number of threads you can create with the new thread library is
> only limited by system resources.

Thanks.  I've updated http://www.kegel.com/c10k.html#threaded
accordingly.

- Dan
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