Date: Sun, 21 Jan 2007 22:10:23 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Luigi Rizzo <rizzo@icir.org> Cc: Ivan Voras <ivoras@fer.hr>, freebsd-arch@freebsd.org Subject: Re: bzero & bcopy alignment Message-ID: <18141.1169417423@critter.freebsd.dk> In-Reply-To: Your message of "Sun, 21 Jan 2007 14:00:19 PST." <20070121140019.A83688@xorpc.icir.org>
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In message <20070121140019.A83688@xorpc.icir.org>, Luigi Rizzo writes: >On Sun, Jan 21, 2007 at 10:41:09PM +0100, Ivan Voras wrote: >> Following recent discussion on alignment of bzero() and bcopy(), I've >> added some statistics collecting code to bzero() and bcopy() for >> practice (on a RELENG_6 box), and here are the cumulative results for >> argument alignment: > >i think these profiles depend heavily on the hardware >and usage patterns. Undoubtedly, but on the other hand, a lot of them operate on structs and other data laid out by the compiler, so the unaligned calls are special cases. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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