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Date:      Mon, 15 Jan 2001 11:28:24 -0800 (PST)
From:      John Baldwin <jhb@FreeBSD.org>
To:        John Baldwin <jhb@FreeBSD.org>
Cc:        cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org
Subject:   RE: cvs commit: src/sys/i386/include atomic.h
Message-ID:  <XFMail.010115112824.jhb@FreeBSD.org>
In-Reply-To: <200101140955.f0E9tL235509@freefall.freebsd.org>

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On 14-Jan-01 John Baldwin wrote:
> jhb         2001/01/14 01:55:21 PST
> 
>   Modified files:
>     sys/i386/include     atomic.h 
>   Log:
>   Fix the atomic_load_acq() and atomic_store_rel() functions to properly
>   implement memory fences for the 486+.  The 386 still uses versions w/o
>   memory fences as all operations on the 386 are not program ordered.
>   The 386 versions are not MP safe.

This has really helped my SMP stability here locally.  The quad xeon has now
built 4 releases back to back w/o any problems.  It never made it through 2
without locking up before.

-- 

John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/
PGP Key: http://www.baldwin.cx/~john/pgpkey.asc
"Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/


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