From: Brian Gerst <bgerst@quark.didntduck.org>
To: Dan Kegel <dank@kegel.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Hardware limits on numbers of threads?
Date: Wed, 18 Sep 2002 07:57:11 -0400 [thread overview]
Message-ID: <3D886A17.60509@quark.didntduck.org> (raw)
In-Reply-To: 3D88208E.8545AAA2@kegel.com
Dan Kegel 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.
>>Specifically this applies to IA-32 (and AMD x86_64) where the thread
>>register is a segment register. The processor architecture
>>puts an upper limit on the number of segment register values
>>which can be used (8192 in this case).
>
>
> Is this true? Where does the limit come from?
> - Dan
A long time ago Linux did use one GDT segment for a TSS and LDT for each
process. Then it was changed in 2.3.11 to have one TSS and LDT per cpu,
removing the limit on the number of processes that can exist in the system.
--
Brian Gerst
prev parent reply other threads:[~2002-09-18 11:53 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-18 6:43 Hardware limits on numbers of threads? Dan Kegel
2002-09-18 7:02 ` Ulrich Drepper
2002-09-18 16:30 ` Dan Kegel
2002-09-18 19:19 ` Jamie Lokier
2002-09-19 9:36 ` Andi Kleen
2002-09-18 7:29 ` Giuliano Pochini
2002-09-18 11:37 ` Denis Vlasenko
2002-09-18 7:05 ` Jakub Jelinek
2002-09-18 11:57 ` Brian Gerst [this message]
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