The 1 and 2 cycles listed in the databook are throughputs in the undocumented FPU pipeline, which means that if you run your program on a big enough buffer so consecutive elements can be processed in parallel then you can achieve almost the listed cycle counts. Indicates instruction length back to the Prefetch Unit, allowing the Prefetch Unit to shift the appropriate number of bytes to the beginning of the next instruction. That is making the processor run faster than it’s designed to do. I’m pretty sure the OLPC engineers already thought of this and ran into problems, otherwise they’d have shipped it overclocked. Still, for the serious geek, there is an easy fix for a slow processor: OLPC is not death; eg.

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If the queue is full then it stalls the IU. Bill Stewart March 28, 8: In prefetch mode it can load one additional cache line from RAM for each access. Incomments by AMD indicated that there are no plans for any future micro architecture upgrades to the processor and that there will be no successor; however, the processors will still be available with the planned availability of the Geode LX extending through FIFO containing decoded x86 instructions. An overclocked or overheated XO that goes south should just quietly crap out.

It adds grode clocks of cache latency, if memory operand is not in last accessed way of data cache. I just bought 2 shelves XO.


The power consumption is However, they have come under competitive pressure from VIA on the x86 side, and ARM processors from various vendors taking much of the low-end business. For this to work, you must have a developer key, or have previously disabled security on your OLPC. No, the cpu and ram is important. It is expected that the Geode line of processors will be updated less frequently due to the closure of the Geode design center.

Waves of XO speed. It can be configured to be data-only, instruction-only, or combined.

Geode LX – OLPC

About the tablet Specifications Buying Help using Support for. Computes linear address of operand data if required geodd issues request to the Data Memory Cache. LX brought many improvements, such as higher speed DDR, a re-designed instruction pipe, and a more powerful display controller. The instruction and data L1 TLBs are both entry, fully associative. One Laptop per Child.

List of AMD microprocessors.

I would not suggest overclocking in Mali or Sudan, but in Peru, at higher elevations where its cold and wet, the speed does make a difference. There are no official references to this processor except officials explaining that the batch of CPUs were “being shipped to specific customers”, though it is clear it has no relation with the other Geode NX CPUs other than sharing the same CPU socket Socket A.

Geode processors are optimized for low power consumption and low cost while still remaining compatible with software written for the x86 platform. That’s why there’s always some additio ….


It can increase sequential read speed, but the latence for random access will be increased in that case. The L2 cache is KB, 4-way set associative, with an undocumented line size. Retrieved from ” http: Note that these cycle counts and delays geoe not mean that I know the FPU pipeline and it really takes that many cycles to execute an instruction, it just means that from the perspective of the IU it looks like that and that is what is needed for assembly optimization.

This page was last edited on 25 Octoberat Notes about L1 Data Cache: The L2 TLB is entry, 2-way set associative. Advanced Micro Devices x86 microprocessors Embedded microprocessors.

AMD Geode LX

This decode looks-ahead to the next instruction and the bubble can be squashed if the pipeline stalls down stream.

Juan Vera July 12, 9: There mostly is a reason CPUs are sold at a specific clock frequency.

I’m pretty sure the OLPC engineers already thought of this and ran into problems, otherwise they’d have shipped it overclocked.