[6263] in RedHat Linux List
Re: SMP systems, XING streaming video
daemon@ATHENA.MIT.EDU (Eric Smith)
Tue Nov 26 14:51:04 1996
Date: 26 Nov 1996 20:22:26 -0000
From: Eric Smith <eric@brouhaha.com>
To: Stephen Zedalis <tintype@zedalis.com>
CC: redhat-list@redhat.com
In-reply-to: <Pine.LNX.3.95.961126062406.28462A-100000@ninja.zedalis.com>
(message from Stephen Zedalis on Tue, 26 Nov 1996 06:52:58 -0500
(EST))
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
Stephen Zedalis <tintype@zedalis.com> wrote:
> First, even though it has been included in the stable kernels, SMP support
> is still in an alpha experimental stage. In fact, it definitely does not
> do well in some environments. In its current implementation, only one
> CPU (cpu 0) handles all kernel code and all hardware interrupts.
Is that really true? If so, it's not SMP at all. SMP stands for
*Symmetric* multiprocessing, which means each CPU can execute any process,
even in kernel mode.
On the DECsystem-10, they switched from asymmetric to symmetric
multiprocessing in the early 80s, and it really made a big difference.
Of course, converting a single processor kernel to SMP is more work than
making it support AMP.
Cheers,
Eric
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