Messages in this thread | | | Date | Tue, 18 Sep 2007 16:35:43 +0200 | From | Wojciech Kromer <> | Subject | Re: Intel-Quad on GA-P35-S3 motherboard with 4*2GB |
| |
>> [root@kromblack ~]# cat /proc/mtrr >> reg00: base=0x100000000 (4096MB), size=8192MB: write-back, count=1 >> reg01: base=0x280000000 (10240MB), size=2048MB: uncachable, count=1 >> reg02: base=0x260000000 (9728MB), size= 512MB: uncachable, count=1 >> reg03: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1 >> reg04: base=0xc0000000 (3072MB), size=1024MB: uncachable, count=1 >> reg05: base=0xa0000000 (2560MB), size= 512MB: uncachable, count=1 >> reg06: base=0x9ff00000 (2559MB), size= 1MB: write-through, count=1 >> > > Yes, it's a bit strange, but there should be a way to configure it in linux. I found only memmap option which does selection of regions, but not remapping. > So first it says there is 8GB ram at 4GB. Then it deletes the top 2GB > of that and then another 512MB. So now there is 5.5GB at 4GB. It then > says there is 4GB at 0GB, then deletes the top 1GB of that, and then > another 512MB, leaving 2.5GB at 0GB. So overall that sounds like 8GB > total. It also seems that if it had mapped 2GB at 0GB and 6GB at 4GB > the MTRR would have been a heck of a lot simpler (but a 32bit OS would > have had 512MB less ram of course). > > I have 64 bit compilation of course. >> [root@kromblack ~]# dmesg|grep mtrr >> mtrr: your CPUs had inconsistent variable MTRR settings >> mtrr: probably your BIOS does not setup all CPUs. >> mtrr: corrected configuration. >> > > Now that does sound odd. How many CPUs does the machine have? > > It's Intel-quad, so there are 4 CPUs. > So what does the dmesg say about the memory table it got from the bios? > That is the e820 table. >
It's in prevoius mail:
# dmesg|grep BIOS-e820 > BIOS-e820: 0000000000000000 - 000000000009f800 (usable) > BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved) > BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved) > BIOS-e820: 0000000000100000 - 000000009fee0000 (usable) > BIOS-e820: 000000009fee0000 - 000000009fee3000 (ACPI NVS) > BIOS-e820: 000000009fee3000 - 000000009fef0000 (ACPI data) > BIOS-e820: 000000009fef0000 - 000000009ff00000 (reserved) > BIOS-e820: 00000000c0000000 - 00000000c4000000 (reserved) > BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved) > BIOS-e820: 0000000100000000 - 0000000260000000 (usable)
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |