Date: Sun, 21 Jan 2007 23:25:14 +0100 From: Ivan Voras <ivoras@fer.hr> To: freebsd-arch@freebsd.org Subject: Re: bzero & bcopy alignment Message-ID: <ep0p8i$86q$1@sea.gmane.org> In-Reply-To: <20070121140019.A83688@xorpc.icir.org> References: <ep0mlv$194$1@sea.gmane.org> <20070121140019.A83688@xorpc.icir.org>
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[-- Attachment #1 --] Luigi Rizzo wrote: > 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. Yes, I agree. For what it's worth, this was on vmware, almost no network activity. > e.g. some network drivers force you to aligned buffers > which results in misaligned payload requesting in > turn an unaligned bcopy. Not that one can help with this, > but i think that is also important to locate the locations > in the source where the poorly aligned (1-2, maybe > 4 and 8 to some degree) ops occur. Any magic tricks to identify the caller of "current" function in the kernel? [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFs+hQldnAQVacBcgRAtH1AKC0mBWy3Vo8Bk6fs+U1YAvPDGjNPACeN2T6 R/rpwr714lUqF0g0nBP8vjM= =YKvt -----END PGP SIGNATURE-----
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