Date: Sun, 21 Jan 2007 22:41:09 +0100 From: Ivan Voras <ivoras@fer.hr> To: freebsd-arch@freebsd.org Subject: bzero & bcopy alignment Message-ID: <ep0mlv$194$1@sea.gmane.org>
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[-- Attachment #1 --] 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: 128: 117190 64: 46495 32: 745178 16: 35313 8: 64580 4: 131045 2: 17969 1: 25099 This is somewhat early after bootup. First number is the alignment, second argument is the number of calls that passed a pointer having the alignment (e.g. there were 131045 instances of arguments which had data aligned to 4 bytes in either bcopy or bzero). After some compiling (start of a buildkernel), the data is: 128: 341440 64: 66812 32: 1020807 16: 75574 8: 192189 4: 266904 2: 44975 1: 36411 If the data is correct, most data seem to be aligned fairly ok. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFs939ldnAQVacBcgRAk0tAJ0aqms6W+MzFiqWRYKrLiZ7MuuD9gCg8Udc 2hzU0zV9TLUgjEMiWe8ocUU= =/dCH -----END PGP SIGNATURE-----home | help
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