Date: Sun, 7 Jul 2024 12:03:36 -0600 From: Warner Losh <imp@bsdimp.com> To: Mark Millard <marklmi@yahoo.com> Cc: bob prohaska <fbsd@www.zefox.net>, Ronald Klop <ronald-lists@klop.ws>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: ntpd vs ntpdate with no hardware clock Message-ID: <CANCZdfqqh2sq6A7kwZTLD-a8zNh=gUUM7PQydnrGht8hHmTYYQ@mail.gmail.com> In-Reply-To: <3C703965-FE57-441D-9A64-0EB72C7E7E6F@yahoo.com> References: <Zoq7xD2BRT6YyF6l@www.zefox.net> <454282477.15929.1720372600841@localhost> <CANCZdfrdFrCkt8VPd%2Bnv=UpVMzqHmX2kw=7wULwZvkQnHDcAhg@mail.gmail.com> <ZorPEr6JtyUEoE9R@www.zefox.net> <3C703965-FE57-441D-9A64-0EB72C7E7E6F@yahoo.com>
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--0000000000004e14cb061cac1e26 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sun, Jul 7, 2024, 11:54=E2=80=AFAM Mark Millard <marklmi@yahoo.com> wrot= e: > On Jul 7, 2024, at 10:23, bob prohaska <fbsd@www.zefox.net> wrote: > > > On Sun, Jul 07, 2024 at 11:18:56AM -0600, Warner Losh wrote: > >> On Sun, Jul 7, 2024, 11:16=E2=80=AFAM Ronald Klop <ronald-lists@klop.w= s> wrote: > >> > >>> I created fakertc for my rpi4. > >>> > >>> https://www.freshports.org/sysutils/fakertc/ > >>> > >>> Saves the time on shutdown and sets it back early at boot. > >>> > >>> Plus I use ntpdate together with ntpd. Works fine. > >>> > >> > >> Curious why the root mod time isn't firing... it whould alrwady do tha= t > >> > > Root mod time seems fairly laggy: > > rprohask@www:~ % date > > Sun Jul 7 10:20:38 PDT 2024 > > rprohask@www:~ % ls -al / > > total 97 > > drwxr-xr-x 20 root wheel 512 Jul 5 13:21 . > > drwxr-xr-x 20 root wheel 512 Jul 5 13:21 .. > > unless I'm misusing ls -al, of course.... > > I mount with noatime in use. Do you? > Doesn't matter since it's in the superblock. Are you trying to show: > > time when file was created (-Ul) > time when file status was last changed (-cl) > time when file was last modified (-l) > time of last access (-ul) > > You implicitly specified "last modified". So > when was the last change to the root directory > representation? It likely is not modified often. > (Modifications to file content and subdirectories > would not modify / of itself.) > It's in the superblock. Time of last unmount / update (I'd recalled incorrectly). linux can have relatime vs. strictatime modes. > relatime mode updates the atime less often, via > a rule set. A linux can have relatime by default. > Yea... none of that matters... Warner =3D=3D=3D > Mark Millard > marklmi at yahoo.com > > --0000000000004e14cb061cac1e26 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"auto"><div><br><br><div class=3D"gmail_quote"><div dir=3D"ltr" = class=3D"gmail_attr">On Sun, Jul 7, 2024, 11:54=E2=80=AFAM Mark Millard <= ;<a href=3D"mailto:marklmi@yahoo.com">marklmi@yahoo.com</a>> wrote:<br><= /div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le= ft:1px #ccc solid;padding-left:1ex">On Jul 7, 2024, at 10:23, bob prohaska = <<a href=3D"mailto:fbsd@www.zefox.net" target=3D"_blank" rel=3D"noreferr= er">fbsd@www.zefox.net</a>> wrote:<br> <br> > On Sun, Jul 07, 2024 at 11:18:56AM -0600, Warner Losh wrote:<br> >> On Sun, Jul 7, 2024, 11:16=E2=80=AFAM Ronald Klop <<a href=3D"m= ailto:ronald-lists@klop.ws" target=3D"_blank" rel=3D"noreferrer">ronald-lis= ts@klop.ws</a>> wrote:<br> >> <br> >>> I created fakertc for my rpi4.<br> >>> <br> >>> <a href=3D"https://www.freshports.org/sysutils/fakertc/" rel= =3D"noreferrer noreferrer" target=3D"_blank">https://www.freshports.org/sys= utils/fakertc/</a><br> >>> <br> >>> Saves the time on shutdown and sets it back early at boot.<br> >>> <br> >>> Plus I use ntpdate together with ntpd. Works fine.<br> >>> <br> >> <br> >> Curious why the root mod time isn't firing... it whould alrwad= y do that<br> >> <br> > Root mod time seems fairly laggy:<br> > rprohask@www:~ % date<br> > Sun Jul=C2=A0 7 10:20:38 PDT 2024<br> > rprohask@www:~ % ls -al /<br> > total 97<br> > drwxr-xr-x=C2=A0 20 root wheel=C2=A0 =C2=A0 =C2=A0512 Jul=C2=A0 5 13:2= 1 .<br> > drwxr-xr-x=C2=A0 20 root wheel=C2=A0 =C2=A0 =C2=A0512 Jul=C2=A0 5 13:2= 1 ..<br> > unless I'm misusing ls -al, of course....<br> <br> I mount with noatime in use. Do you?<br></blockquote></div></div><div dir= =3D"auto"><br></div><div dir=3D"auto">Doesn't matter since it's in = the superblock.</div><div dir=3D"auto"><br></div><div dir=3D"auto"><div cla= ss=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 = .8ex;border-left:1px #ccc solid;padding-left:1ex"> Are you trying to show:<br> <br> time when file was created (-Ul)<br> time when file status was last changed (-cl)<br> time when file was last modified (-l)<br> time of last access (-ul)<br> <br> You implicitly specified "last modified". So<br> when was the last change to the root directory<br> representation? It likely is not modified often.<br> (Modifications to file content and subdirectories<br> would not modify / of itself.)<br></blockquote></div></div><div dir=3D"auto= "><br></div><div dir=3D"auto">It's in the superblock. Time of last unmo= unt / update (I'd recalled incorrectly).</div><div dir=3D"auto"><br></d= iv><div dir=3D"auto"><div class=3D"gmail_quote"><blockquote class=3D"gmail_= quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1= ex"> linux can have relatime vs. strictatime modes.<br> relatime mode updates the atime less often, via<br> a rule set. A linux can have relatime by default.<br></blockquote></div></d= iv><div dir=3D"auto"><br></div><div dir=3D"auto">Yea... none of that matter= s...</div><div dir=3D"auto"><br></div><div dir=3D"auto">Warner</div><div di= r=3D"auto"><br></div><div dir=3D"auto"><div class=3D"gmail_quote"><blockquo= te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so= lid;padding-left:1ex"> =3D=3D=3D<br> Mark Millard<br> marklmi at <a href=3D"http://yahoo.com" rel=3D"noreferrer noreferrer" targe= t=3D"_blank">yahoo.com</a><br> <br> </blockquote></div></div></div> --0000000000004e14cb061cac1e26--
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