Date: Tue, 2 Jul 2013 23:45:57 +0200 (CEST) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Daniel Braniss <danny@cs.huji.ac.il> Cc: freebsd-hackers <freebsd-hackers@freebsd.org> Subject: Re: hw.physmem/hw.realmem question Message-ID: <alpine.BSF.2.00.1307022343590.4738@wojtek.tensor.gdynia.pl> In-Reply-To: <E1Utzkq-000Jin-Ig@kabab.cs.huji.ac.il> References: <E1Utzkq-000Jin-Ig@kabab.cs.huji.ac.il>
next in thread | previous in thread | raw e-mail | index | archive | help
> AMD Features2=0x1<LAHF> > TSC: P-state invariant, performance statistics > real memory = 34359738368 (32768 MB) > avail memory = 32191340544 (30700 MB) 2GB memory "disappears" too even when you don't set anything. i asked such a question for other machine some time ago without much answer. in your laptop it may be shared graphics memory reserved by chipset still on my dell server real memory = 34359738368 (32768 MB) avail memory = 33166921728 (31630 MB) i have over 1GB unavailable and it doesn't have shared graphics memory. it would be nice to be able to look exactly how memory is used. > Event timer "LAPIC" quality 600 > ACPI APIC Table: <DELL DCSRADON> > > and from sysctl: > hw.physmem: 34284916736 > hw.usermem: 32964923392 > hw.realmem: 36507222016 > > after setting > hw.physmem=16G > > from dmesg: > real memory = 34359738368 (32768 MB) > avail memory = 13999382528 (13350 MB) > > and sysctl: > > hw.physmem: 14957563904 > hw.usermem: 10094678016 > hw.realmem: 17179869184 > > from the numbers, I can assume that realmem is the real physical memory, > (or whatever is set in hw.physmem), > if so, where did almost 2G go? (realmem - physmen) > > the only info I found so far is: > from loader(8): > > hw.physmem Limit the amount of physical memory the system will use. > By default the size is in bytes, but the k, K, m, M, g and > G suffixes are also accepted and indicate kilobytes, > megabytes and gigabytes respectively. An invalid suffix > will result in the variable being ignored by the kernel. > > what is physmem and realmem, and what's the relationship - if any - between > them? > > cheers, > danny > > > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" > >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?alpine.BSF.2.00.1307022343590.4738>