Opterony vs Xeony - aneb cim a jak prelozit program v C

[Jan Kasprzak]

petr.kristan na epos.cz wrote:
: > 	A kdyz jeden z tech CPU vytahnete? Resp. mate maximalni sirku pameti?
: > Tj. u kazdeho CPU sudy pocet pametovych modulu v tech spravnych bankach?
: > Nemate nahodou v BIOSu zapnute prokladani pameti? Linux umi k dual-K8 pristupovat
: > jako k NUMA, takze je lepsi umisteni v pameti ponechat na jadru. Jak rychle jsou
: > pameti v P4 a jak v K8?
: Co je potreba aby Linux pristupoval k pameti u 2xK8 jako NUMA?

	CONFIG_NUMA=y, CONFIG_K8_NUMA=y, a prave to vypnute prokladani pameti
v BIOSu (neco jako "inter-node memory inteleaving" nebo tak podobne).

: Jak se
: pozna, ze tak cini?

	V bootovacich zpravach jadra je neco jako

Scanning NUMA topology in Northbridge 24
Number of nodes 2
Node 0 MemBase 0000000000000000 Limit 0000000100000000
Node 1 MemBase 0000000100000000 Limit 0000000200000000
Using 30 for the hash shift.
Using node hash shift of 30
Bootmem setup node 0 0000000000000000-0000000100000000
Bootmem setup node 1 0000000100000000-0000000200000000
On node 0 totalpages: 1012235
  DMA zone: 2531 pages, LIFO batch:2
  DMA32 zone: 1009704 pages, LIFO batch:64
  Normal zone: 0 pages, LIFO batch:2
  HighMem zone: 0 pages, LIFO batch:2
On node 1 totalpages: 1013647
  DMA zone: 0 pages, LIFO batch:2
  DMA32 zone: 0 pages, LIFO batch:2
  Normal zone: 1013647 pages, LIFO batch:64
  HighMem zone: 0 pages, LIFO batch:2

-Y.

-- 
| Jan "Yenya" Kasprzak  <kas at {fi.muni.cz - work | yenya.net - private}> |
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| http://www.fi.muni.cz/~kas/    Journal: http://www.fi.muni.cz/~kas/blog/ |
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> for implementing software.                              --Linus Torvalds <