2012/7/16 Martín Marqués <martin.marques@xxxxxxxxx>: > I had a problem with my main board and CPU and had to buy a new one. > Also memory, as the old computer had DDR2 memory. > > Th problem is that I see only 3.5Gb of memory, while I had a 4Gb bank > put in the Motherboard (the motherboard says it can handle up to 32Gb > or ram). > > I saw this in dmesg: > > [ 0.000000] Memory: 3491896k/4702208k available (6177k kernel code, > 1053240k absent, 157072k reserved, 7004k data, 1004k init) > > Why do I get this: > > $ free > total used free shared buffers cached > Mem: 3513412 2591976 921436 0 8332 914584 > -/+ buffers/cache: 1669060 1844352 > Swap: 0 0 0 > There are several possible factors: 1) Integrated video card, which uses system memory. 2) Peripheral devices I/O regions are mapped below 4 GB, shadowing the physical ram. Here is (old, but still valid) explanation given by IBM for their servers: https://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-4E4RRF and here's the same issue addressed by Microsoft: http://support.microsoft.com/kb/978610 I did not manage to find Red Hat's take on the issue. In short: Works as designed. You may try to disable devices you do not use to salvage some address space, but you won't reach 4096 MB available. > > -- > Martín Marqués > select 'martin.marques' || '@' || 'gmail.com' > DBA, Programador, Administrador > -- > users mailing list > users@xxxxxxxxxxxxxxxxxxxxxxx > To unsubscribe or change subscription options: > https://admin.fedoraproject.org/mailman/listinfo/users > Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines > Have a question? Ask away: http://ask.fedoraproject.org -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
