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From: Bill Davidsen <davidsen@tmr.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [ANN] Userspace M-on-N threading model implementation. Alpha release.
Date: Sun, 04 Feb 2007 15:12:32 -0500	[thread overview]
Message-ID: <45C63E30.4010106@tmr.com> (raw)
In-Reply-To: <1170516376.3073.1015.camel@laptopd505.fenrus.org>

Arjan van de Ven wrote:
>> Because user threading can avoid context switches, there will always be 
>> cases where it will outperform o/s threads for hardware reasons.
> 
> actually.. switching from one "real" thread to another in Linux is not
> an actual context switch in the hardware sense... at least this part of
> your argument seems to be incorrect ;)
> 
How does that work? Switching between kernel threads requires going into 
the kernel, user level thread switches are all done in user mode.

Do you have some way to change o/s threads w/o going into the kernel?

-- 
Bill Davidsen <davidsen@tmr.com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot

  reply	other threads:[~2007-02-04 20:12 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-30 21:16 Kaz Kylheku
2007-01-31  8:47 ` Evgeniy Polyakov
2007-02-02 16:12 ` Bill Davidsen
2007-02-03 15:26   ` Arjan van de Ven
2007-02-04 20:12     ` Bill Davidsen [this message]
2007-02-04 20:20       ` Jakub Jelinek
2007-02-04 21:42         ` Bill Davidsen
2007-02-05  6:14           ` Arjan van de Ven
2007-02-14 12:17           ` Pavel Machek
2007-02-04 22:52         ` Davide Libenzi
  -- strict thread matches above, loose matches on Subject: below --
2007-01-29 14:52 Evgeniy Polyakov
2007-01-29 14:57 ` Evgeniy Polyakov
2007-01-29 16:40 ` Chris Friesen
2007-01-30  9:46   ` Evgeniy Polyakov
     [not found] ` <40f323d00701290747y68c8e27ege824694bfa378f58@mail.gmail.com>
2007-01-30  1:18   ` Samuel Thibault
2007-01-30  9:53     ` Evgeniy Polyakov
2007-01-30 10:24       ` Samuel Thibault
2007-01-30 10:43         ` Evgeniy Polyakov
2007-02-01  4:28 ` Lee Revell
2007-02-01  7:09   ` Evgeniy Polyakov

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