From: Brad Boyer <flar@allandria.com>
To: Linas Vepstas <linas@austin.ibm.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
akpm@osdl.org, linuxppc64-dev@ozlabs.org, torvalds@osdl.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] PPC64 iSeries: cleanup viopath
Date: Tue, 15 Mar 2005 09:49:30 -0800 [thread overview]
Message-ID: <20050315174929.GC10301@pants.nu> (raw)
In-Reply-To: <20050315174310.GH498@austin.ibm.com>
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.
Brad Boyer
flar@allandria.com
next prev parent reply other threads:[~2005-03-15 17:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-15 3:34 [PATCH] PPC64 iSeries: cleanup viopath Stephen Rothwell
2005-03-15 14:32 ` Hollis Blanchard
2005-03-15 15:53 ` Stephen Rothwell
2005-03-15 17:43 ` Linas Vepstas
2005-03-15 17:49 ` Brad Boyer [this message]
2005-03-16 15:12 ` Hollis Blanchard
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