Re: [PATCH] PPC64 iSeries: cleanup viopath
From: Brad Boyer
Date: Tue Mar 15 2005 - 13:05:13 EST
On Tue, Mar 15, 2005 at 11:43:10AM -0600, Linas Vepstas wrote:
> FWIW, keep in mind that a cache miss due to large structures not fitting
> is a zillion times more expensive than byte-aligning in the cpu
> (even if byte operands had a cpu perf overhead, which I don't think
> they do on ppc).
Actually, there is a small overhead to bytes if you make them signed.
That's why char is unsigned by default on ppc.
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