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RN3220 CPU upgrade -- Negligible effect??
I upgraded the processor of an RN3220 from an i3-3220 3.30GHz, which is dual-core 4-thread CPU, to a Xeon E3-1225 V2 @ 3.20GHz, a quad-core 4-thread CPU as comes in an RN4220 and sysbench shows almo...
OK, I'm not entirely sure what was going on. I upgraded a second one and got way better results. So I swapped the memory between the two and the first one now gave me the improved speed. Just to check, I swapped the memory back, and now they both perform like this:
Test execution summary:
total time: 2.5567s
total number of events: 10000
total time taken by event execution: 20.4385
per-request statistics:
min: 1.02ms
avg: 2.04ms
max: 28.60ms
approx. 95 percentile: 11.02msThreads fairness:
events (avg/stddev): 1250.0000/27.44
execution time (avg/stddev): 2.5548/0.00So, the memory must not have been seated well, even though dmidecode showed both banks properly. Since I swapped out the memory before the CPU, I suspect that the performance shown for the original processor is also bogus.
I wish Netgear had included dmidecode in the tools of the base OS. If it were, you could use the examples from here (https://askubuntu.com/questions/1330514/how-to-check-ram-channel) to make sure that it was running in dual channel.
You might be able to see the memory config from the BIOS if you still have the monitor hooked up.
Laserbait wrote:
I wish Netgear had included dmidecode in the tools of the base OS.
FWIW, I installed it with no problems on my RN526x
apt-get install dmidecodeDmidecode confirms one DIMM in channel A and one in Channel B. But for grins, I put both in Channel A and the result was basically no change (within the normal variation since the OS background tasks are also running).
OK, I'm not entirely sure what was going on. I upgraded a second one and got way better results. So I swapped the memory between the two and the first one now gave me the improved speed. Just to check, I swapped the memory back, and now they both perform like this:
Test execution summary:
total time: 2.5567s
total number of events: 10000
total time taken by event execution: 20.4385
per-request statistics:
min: 1.02ms
avg: 2.04ms
max: 28.60ms
approx. 95 percentile: 11.02msThreads fairness:
events (avg/stddev): 1250.0000/27.44
execution time (avg/stddev): 2.5548/0.00So, the memory must not have been seated well, even though dmidecode showed both banks properly. Since I swapped out the memory before the CPU, I suspect that the performance shown for the original processor is also bogus.
Well, that awesome! Very strange and confusing, but hopefully it stays consistently fast.
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