ragemem benchmark results thread !

@Thread

Crisot gave an explanation (in French) on Amiga-NG:

"Sur SAM460, la RAM tourne à la vitesse du L2... Soit le L2 du 460EX est pas terrible, soit j'ai loupé un truc (mais quoi...)

(On Sam460, RAM goes as fast as L2 cache. Either L2 from the Sam460 is rubbish or I missed someting)

Sur X1000, c'est encore pire, l'écriture RAM est supérieure à l'écriture L2, ce qui est matériellement impossible, la RAM passant forcément par le L2... Je me demande si ma loop est pas trop courte pour bencher à ces vitesses là.

(It's even worse on X1000 : writing in RAM is faster than writing in L2, which in impossible since RAM goes through the L2 cache... I'm wondering if my Loop is too short to bench such speeds)

Pour le tricky super lent, c'est parceque mon code n'est pas adapté à la Cache Line du PA6T.

(Regarding the super slow tricky test, it's because my code is not adapted to the PA6T Cache Line)

Pour les MIPS. Je n'ai que des hypothèses mais pas de réponse:

(Regarding MIPS, I have only hypothesis but no answers)

-Déjà, mon bench n'est pas multi-threadé, il n'utilise qu'un seul core, donc il faut multiplier par 2 ce chiffre.

(First, my bench is not multithreaed, it uses only one core so we must multiply x2 this value)

-Dans tous les cas le PA6T@2.0 Ghz est donné constructeur pour 8800 MIPS, ça fait 3960 MIPS par core@1.8 Ghz.

(Anyway, PA6T@2.0Ghz should give, from the manufaturer, 8800MIPS, so 3960 MIPS by core@1.8Ghz.)

-Ma loop n'est pas du tout optimisée pour le PA6T, elle a été écrite avec les datasheet des 604e/G3/G4/460EX. Je pense que le PA6T ne dispatche pas du tout les instructions de la même manière, mais sans datasheet je peux rien écrire.

(My loop is not at all optimized for the PA6T, it was written with 604e/G3/G4/460EX datasheets. I suspect the PA6T to not dispatch instructions the same way than the others but without the datasheets, I cannot be sure nor enhance Ragemem[i]).

-Au dela des MIPS la rapidité des caches et de la ram ont une énorme influence sur les performances CPU. A titre d'exemple, lire un seul octet en mémoire sur un XE (240 mo/sec) équipé d'un G4@1.0Ghz (3000 MIPS), c'est en temps machine l'équivalent de 104 instructions perdues (!!!) pendant lesquelles le CPU attend. En clair, un G4 attend continuellement après le reste de la machine, si on pouvait convertir le temps machine perdu en taches ménagères, la pelouse serait toujours tondue et la maison propre.

([i]Beyond MIPS, caches and RAM speed make a huge difference in CPU performances. For example, reading only on byte in memory on the XE (240MB/s) with a G4@1Ghz (3000MIPS), is equivalent of 104 lost instructions (!!!) while the CPU is waiting. To simplfy : a G4 is always waiting for the the other parts of the comuter. If we could convert the lost time by the system in household tasks, the house would always be clean.)

Je pense pas que core à core (ahah) le PA6T soit beaucoup plus puissant que le G4, mais tout ce qui tourne autour (caches, bus, ram) lui laisse infiniment plus de marge de manoeuvre. Le G4 ira beaucoup moins vite, mais paradoxalement glandera beaucoup plus.

(I don't think that the PA6T core is much more powerful than the G4 core, but everything that makes the X1000 (caches, FSB, RAM) gives him more latitude. G4 will be way slower but, paroxally, will wait a lot more for the rest of the architecture.)."

I hope I have translated everything correctly

wow just realized I never updated my old ragemem thread with results from my X1000 as I started it with my old Samflex@800.

well better late than never

X1000,4GB ram, Radeon HD7750-1GB VRam (low profile, single slot)

[img width=300]RageMem-June14-15-HD7750 [/url], [/img]

well now, very interesting seeing my much stronger Gigabyte HD7950, 3GB Ram performing worse here compared to my older single slot low profile HD7750 above??

also noticed that SuperTuxkart ran very smooth with my HD7750 and is running very slow & choppy with my HD7950?? more testing later with my 7950


[img]RageMem-HD7950-Jun16-15 by G S, [/img]

@angelheart

Quote:

The newer AMMC PowerPC SOCs only scale to 1.3Ghz.

The LSI Axxia PowerPC SOCs look much more interesting on paper. They scale as high as 1.8Ghz on a 4 core SOC and the 476fp core is rated at 2.7 DMIPs per Mhz. It also has bigger L2 cache than the 465 cores as well as large L3 cache.
It also has a SIMD unit although I'm not sure if this is Altivec/VMX* although it would make sense for IBM to have designed a a new vector unit for the 476fp.
LSI don't specify what version of PCIe is used on there product pages but I did see a product breif that sugested that it was PCIe 3.0

A system based on that faster Axxia SOCs should be able to trounce the X1000 in every aspect.

Both the Axxia ACP3500 and ACP3400 have a 1295 pin/ball count so in theory should be able to use the same board for both. That would give a good range of speeds and cores. The 3500 can have 2 cores at 1.1Ghz, 2 cores at 1.26Ghz, 4 cores at 1.26Ghz and 6 cores at 1.26Ghz while the 3400 can have 2 cores at 1.6Ghz or 4 cores at 1.8Ghhz

*VMX is IBM's name for Altivec.

@TSK

HI, I have the exact same machine, and G3 CPU.
What voltage do you run your CXe CPU on ?

I'm running mine at 666MHz at 1.64V, had to step it up from 1.59V.

Have you tried any higher ?

Thanks.

Anyone with the AmigaOne G3-SE 600MHz machine ?

I'm running mine at 666MHz at 1.64V, had to step it up from 1.59V to run stable.
Has anyone tired higher?

Also, what is a good calibration for the CPUTemp docky ? In terms of showing accurate temperature.

Thanks.