[pve-devel] some finding avout minimum static memory when pc-dimm exists

Alexandre DERUMIER aderumier at odiso.com
Mon Jan 26 09:18:13 CET 2015


Seem that the current qemu limit is 42bits

target-i386/cpu.c

        if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM) {
            /* 64 bit processor */
/* XXX: The physical address space is limited to 42 bits in exec.c. */
            *eax = 0x00003028; /* 48 bits virtual, 40 bits physical */





----- Mail original -----
De: "datanom.net" <mir at datanom.net>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Dimanche 25 Janvier 2015 19:51:20
Objet: Re: [pve-devel] some finding avout minimum static memory when pc-dimm exists

On Sun, 25 Jan 2015 19:20:12 +0100 (CET) 
Dietmar Maurer <dietmar at proxmox.com> wrote: 

> 
> A real 64bit system is not limited to 4TB, because 2^64 is 18446744073709551616. 
> 
> But I guess current processors do not use 64 address lines ;-) 
> 
Current processors use 48 bits for addresses, so 2^48 -1 = 
2,814749767×10¹⁴ 

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