Date: Tue, 14 Feb 2006 09:49:30 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-alpha@freebsd.org Subject: Re: Error in sysctl realmem on alpha Message-ID: <200602140949.31367.jhb@freebsd.org> In-Reply-To: <27dbfc8c0602140252o6ae09399taaedac8266c09c64@mail.gmail.com> References: <27dbfc8c0602140252o6ae09399taaedac8266c09c64@mail.gmail.com>
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On Tuesday 14 February 2006 05:52, Valerio daelli wrote: > Hi > we have an AlphaServer DS10 with FreeBSD 5.4 with 256Mb of RAM. > > root@webgate:~ uname -a > FreeBSD webgate.ifom-ieo-campus.it 5.4-RELEASE-p8 FreeBSD > 5.4-RELEASE-p8 #0: Thu Nov 17 13:13:48 CET 2005 > eldon@webgate.ifom-firc.it:/usr/src/sys/alpha > > It looks like the sysctl of realmem is a bit to high: > > root@webgate:~ sysctl -a|egrep '(real|phys|user)mem' > hw.physmem: 265486336 > hw.usermem: 225648640 > hw.realmem: 2174864064512 > > but the realmem of dmesg is right > > root@webgate:~ dmesg |grep mem > real memory = 265486336 (253 MB) > avail memory = 250503168 (238 MB) > > Maybe everything is due to a shift of 13 bits in > /usr/src/sys/alpha/alpha/machdep.c: > > realmem = alpha_ptob(Maxmem) > > and the realmem is again shifted 13 bits (so it is shifted twice > instead of once) in /usr/src/sys/kern/kern_mib.c: > > val = ctob(realmem); > > Sorry I am not really sure I am not so strong in C and kernel > programming is a bit far from my knowledge. > Thanks Your diagnosis appears correct. I'll fix it shortly. Thanks! -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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