AMD K6 200

Kostas Liakakis kostas at rincewind.techpath.gr
Fri Sep 26 17:24:30 EEST 1997


On Fri, 26 Sep 1997, Stelios Valtzis wrote:

> Oi epeksergastes 686 exoun diaforetiki texnologia apo tous pentium kai
> diaforetiko op-code set. Einai vasismenoi se texnologia Risc, eno oi
> pentium se texnologia Sisc. 

Peripou... Ap'e3o einai cisc kai apo mesa psilo-risc.

> Otan eixe protoanakoino8ei to project tou 686, oi kataskevastes eixan
[xrats!]
> kai ena krousma asimvatotitas gia na xaraktiristei ws provlimatiki i
> anava8misi.

Ma kala, pou ta exeis akousei ola auta? Kai bebaia einai plhros symbatoi. 
Kai bebaia 0a yparxoun psilola0akia (mhpos 3exase kaneis to FDIV bug tou
P5?). Alla oxi toso oste na einai axrhstoi. Auta pou yparxoun (FDIV, to 
bug tou K6) symbainoun se poly akraies syn0hkes.

3ereis ti einai to bug tou K6 gia to opoio leme? Ena la0os ston
microkodika tou epe3ergasth oson afora to branch prediction, kai
emfanizetai kato apo sy0hkes kodika pou metabalei ton eauto tou (self
modifing) pou brhsketai sthn L1 cache tou epe3ergasth, kai epipleon exei
kai akomh 3-4 pramata pou prepei na syntrexoune. 

E3allou, ola auta ta exei anakoinosei h AMD kai dior0onei se ka0e 
revision tou chip oti mporei. Epishs einai diate0hmenoi na sou alla3oun 
ka0e chip pou einai problhmatiko, toulaxiston sthn amerikh. Ama fona3eis 
poly mporei na sto kanoun kai edo.

Kai h texnologia & oi epe3ergastes exoun testaristei kai sta ergostasia 
prin kykloforhsoun kai afotou bghkan den exoun ta tromaktika problhmata. 
Exo doulepsei se arketa PPro (kai dual) opou pragmatika den exo synanthsei 
kanena problhma.

> Prosopika, den exo empeiria apo anava8misi se 686, alla to gegonos oti o
> 2.0.30 kernel exei option gia ppro compilation einai endiktiko.

Endeiktiko tou oti gia tous P6 exoun brei diaforetika optimizations pou
ekmetalleuontai thn arxitektonikh tous kai pou einai diaforetika apo ta
antistoixa gia tous P5, 486, Cyrix, klp klp. 

-K.

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