From: Ingo Oeser <ingo.oeser@informatik.tu-chemnitz.de>
To: Scott Huang <SHuang@narus.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: CMPXCHG
Date: Thu, 17 May 2001 13:43:35 +0200 [thread overview]
Message-ID: <20010517134335.F754@nightmaster.csn.tu-chemnitz.de> (raw)
In-Reply-To: <580E532D9F7A9B4BAE8A130848E0DDA70B7842@franklin.narus.com>
In-Reply-To: <580E532D9F7A9B4BAE8A130848E0DDA70B7842@franklin.narus.com>; from SHuang@narus.com on Wed, May 16, 2001 at 03:37:00PM -0700
On Wed, May 16, 2001 at 03:37:00PM -0700, Scott Huang wrote:
> Four adapters need to produce data to a
> descriptor queue which is consumed by a
> user process. A lock mechanism was implemented
> to sync the adapters. However, this causes
> a performance hit. Is it possible to use
> CMPXCHG on Intel's i-386 to avoid the locking?
What about using atomic operations for that? This is more general
and works on ALL architectures. CMPXCHG is just and special
atomic operation on ia32.
> Where can I find some doc and some sample code?
Documentation/DocBook/kernel-hacking.tmpl
But better do
make htmldocs
in the kernel top level directory and read
Documentation/DocBook/kernel-hacking/lk-hacking-guide.html
instead.
Sample code is scattered all around in the kernel.
Regards
Ingo Oeser
--
To the systems programmer,
users and applications serve only to provide a test load.
prev parent reply other threads:[~2001-05-17 11:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-05-16 22:37 CMPXCHG Scott Huang
2001-05-17 11:43 ` Ingo Oeser [this message]
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