Date: Thu, 28 Mar 2002 10:46:54 -0700 (MST) From: "M. Warner Losh" <imp@village.org> To: phk@critter.freebsd.dk Cc: kris@obsecurity.org, roberto@eurocontrol.fr, freebsd-current@FreeBSD.ORG Subject: Re: Time counter broken? Message-ID: <20020328.104654.74403212.imp@village.org> In-Reply-To: <17301.1017317101@critter.freebsd.dk> References: <20020328034747.B98857@xor.obsecurity.org> <17301.1017317101@critter.freebsd.dk>
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In message: <17301.1017317101@critter.freebsd.dk>
Poul-Henning Kamp <phk@critter.freebsd.dk> writes:
:
: I think I found a mistake I made, can you try this patch please ?
:
: Index: kern_tc.c
: ===================================================================
: RCS file: /home/ncvs/src/sys/kern/kern_tc.c,v
: retrieving revision 1.117
: diff -u -r1.117 kern_tc.c
: --- kern_tc.c 19 Mar 2002 21:24:06 -0000 1.117
: +++ kern_tc.c 28 Mar 2002 12:00:13 -0000
: @@ -241,7 +241,7 @@
: * The range is +/- 500PPM so we can multiply by about 8500
: * without overflowing. 4398/1024 = is very close to ideal.
: */
: - scale += (tc->tc_adjustment * 4398) >> 10;
: + scale += (tc->tc_adjustment * 4398) >> 11;
: scale /= tc->tc_tweak->tc_frequency;
: tc->tc_scale = scale * 2;
: }
This patch is broken because it doesn't fix the comment, which should
read
... 4398 / 2048 is very close to ideal.
Warner
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