[coreboot] Dual Channel RAM issue F2a85m

[kinky_nekoboi]

It seems like Dual Channel is not working properly on F2a85m.

sysbench memory test gives me only a bandwidth of 1700MB/s with my used
2x 4GB DDR3 1333MHz Ram sticks.

on my thinkpad W520 with 2x 4GB DDR3 it gives me the double bandwidth of
3400MB/s

thats one issue of many of the current status of the f2a85m board.

Anybody knows if there is still WIP on this board?

is there anything one could to do to improve the situation?

[Mike Banon]

Finally I've done these memory benchmarks at G505S as you requested
( memory installed: 2*8GB 1600MHz 9-9-10-27 )
memtest: 4874 MB/sec
sysbench at Kubuntu 16.04.5 LiveUSB (systemd, very old kernel) - just
1325 MB/sec
sysbench at Void Linux Nov2018 LiveUSB (no systemd, 4.18 kernel) - 2540 MB/sec
Almost 2x difference just by changing OS. Same parameters have been used:
./sysbench --test=memory --memory-total-size=4G --num-threads=4 run
or
./sysbench memory --memory-total-size=4G --threads=4 run
Also tried 12G for both cases with similar respective results

As you see, it really matters under which OS you're running that sysbench

Best regards,
Mike Banon


On Thu, Nov 8, 2018 at 11:49 AM kinky_nekoboi

Post by kinky_nekoboi
It seems like Dual Channel is not working properly on F2a85m.
sysbench memory test gives me only a bandwidth of 1700MB/s with my used
2x 4GB DDR3 1333MHz Ram sticks.
on my thinkpad W520 with 2x 4GB DDR3 it gives me the double bandwidth of
3400MB/s
thats one issue of many of the current status of the f2a85m board.
Anybody knows if there is still WIP on this board?
is there anything one could to do to improve the situation?
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