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by IRBaboon
Fri Aug 26, 2011 3:16 pm
Forum: General discussion
Topic: Wishes for 2nd gen Raspberry Pi
Replies: 272
Views: 66569

Re: Wishes for 2nd gen Raspberry Pi

<r>Quote from Gert van Loo on August 26, 2011, 14:34<br/> Well... if we are talking wishes...<br/> I want to take the GPU (As it is top of the range and good enough for a few years to come), replace the ARM11 with... lets says a Cortex-A9 running at 1GHz. Throw in a big instruction and data cache an...
by IRBaboon
Tue Aug 16, 2011 10:01 pm
Forum: General discussion
Topic: l2 cache?
Replies: 18
Views: 5903

Re: l2 cache?

<t>Memory Bandwidth (bw_mem)<br/> http://lmbench.sourceforge.net.....mem§ion=8<br/> <br/> Description<br/> <br/> bw_mem allocates twice the specified amount of memory, zeros it, and then times the copying of the first half to the second half. Results are reported in megabytes moved per second.<br/> ...
by IRBaboon
Tue Aug 16, 2011 6:36 pm
Forum: General discussion
Topic: l2 cache?
Replies: 18
Views: 5903

Re: l2 cache?

<t>(edit, forgot first row)<br/> Memory Bandwidth (bw_mem)<br/> http://lmbench.sourceforge.net.....;section=8<br/> <br/> CPU Bandwidth [MB/s]<br/> MX35 (ARM11) 128.02<br/> OMAP-EVM (Cortex-A8) 254.05<br/> OMAP-Beagle (Cortex-A8) 241.13<br/> Atom Z510 601.39<br/> <br/> ARM11 is a 64 bit interface.<br...
by IRBaboon
Tue Aug 16, 2011 3:12 pm
Forum: General discussion
Topic: l2 cache?
Replies: 18
Views: 5903

Re: l2 cache?

As i estimate a bottleneck in the small bandwidth (64bit) of the Broadcom SOC we actually may see a L2 cache on the Raspberry Pi ARM11.

Without graphics, L2 cache maybe 15% to 20% performance gain.
Hard to guess what it would be with heavy graphic load.
by IRBaboon
Tue Aug 16, 2011 2:07 am
Forum: General discussion
Topic: l2 cache?
Replies: 18
Views: 5903

Re: l2 cache?

<t>Ape to the rescue!<br/> <br/> The ARM11 core had a 2 cycle L1 cache, while the A8 has a single cycle L1. In-order cores depend heavily on fast memory access, so an even faster L1 will have a dramatic impact on performance.<br/> ARM11 actually supported a L2 cache but it was rarely used.<br/> <br/...
by IRBaboon
Sun Aug 07, 2011 8:16 pm
Forum: General discussion
Topic: overclocking
Replies: 92
Views: 18630

Re: overclocking

Overclocking is limited by the manufacturing process (TSMC 65GP?).
I estimate 700MHz + 200MHz to 250MHz.
by IRBaboon
Sat Aug 06, 2011 8:54 pm
Forum: General discussion
Topic: What have we missed?
Replies: 286
Views: 53817

Re: What have we missed?

<r>Well there *are* whizzier mobile CPUs available from Broadcom, but they're more expensive. We're striving to keep costs down as much as possible to make the device available for schools, the developing world and so on, which is always going to be our main focus. We had to calculate a balance betw...
by IRBaboon
Sat Aug 06, 2011 6:05 pm
Forum: Staffroom, classroom and projects
Topic: Integration of the PI into schools
Replies: 34
Views: 6706

Re: Integration of the PI into schools

<t>For myself programming in school was boring and a waste of time. (Even for me being interested in science/games/EDV.)<br/> We treat kids like things. Watch those chinese, christian or muslim kids for example.<br/> They are forced to memories books (bible, koran or shakespeare) to satisfy their pa...
by IRBaboon
Sat Aug 06, 2011 4:10 pm
Forum: General discussion
Topic: What have we missed?
Replies: 286
Views: 53817

Re: What have we missed?

<r> Sorry, but I don't get what you mean.<br/> I would use the Raspberry Pi more often then my desktop if it could do more work<br/> and i won't upgrade so fast.<br/> <br/> Well, personally I think it's very fast <E>:)</E> Of course, if you compare it with the latest<br/> smarthphone costing twenty ...
by IRBaboon
Sat Aug 06, 2011 3:30 pm
Forum: General discussion
Topic: overclocking
Replies: 92
Views: 18630

Re: overclocking

Thermal paste electrical resistivity can change over time....

Personally i would use superglue.
by IRBaboon
Sat Aug 06, 2011 2:24 pm
Forum: General discussion
Topic: What have we missed?
Replies: 286
Views: 53817

Re: What have we missed?

That ARM11 CPU seems very slow. :( (only 1 integer unit + 1 32bit vector FP coprocessor?)
I wish there was dual core support to promote multi threaded programming.

Funny enough we should save the enviroment with a faster CPU.
by IRBaboon
Sat Aug 06, 2011 1:46 pm
Forum: General discussion
Topic: overclocking
Replies: 92
Views: 18630

Re: overclocking

@AmyS3
Yeah sure Eben builds a custom SOC for every user.
I bet this will be cheap and you will save your 50 cents fot that NIC.
You should try to buy a car with one less door as well.

@Michael
Thermal paste could short circuit the ICs on tha PoP.

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