Hi All
I’ve been testing an NVM Express SSD connected to my Jetson TX1 board with some success and some issues. I wanted to report findings here so others can benefit and also ask about a couple of issues I see. Here are the steps I undertook:
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Stock Jetson TX1 install with 3.10.67-g3a5c467 kernel.
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On a remote host I cross-compiled the stock TX1 kernel after running menuconfig to turn on NVM Express support (as a module). I had to make a couple of changes as noted in other threads to get the code to compile but it went pretty smooth.
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scp’ed the nvme.ko from host to Jetson board.
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sudo insmod nvme.ko
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Installed the nvme-cli tool from source (GitHub - linux-nvme/nvme-cli: NVMe management command line interface.). There is a Ubuntu PPA for this but it does not support arm or aarch64 yet. I am working with Canonical to get that fixed.
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sudo nvme list recognizes the attached device (a PMC NVM Express NVRAM card). Note this is a DRAM backed SSD which is why capacity seems small.
batesste@tegra-ubuntu:~$ sudo nvme list
Node Model Version Namepace Usage Format FW Rev
/dev/nvme0n1 MTR_MLC_TS_4GB 1.0 1 0.00 B / 4.26 GB 512 B + 0 B 2.05.36
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Installed a EXT4 filesystem on the SSD and issue some IO using both dd and fio. All seems to work OK but performance seems a bit low (ping me if you want performance numbers).
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I noticed messages like this in dmesg:
[ 7760.015863] process_cq did something
[ 7760.017047] mc-err: [mcerr] (0) csw_afiw: EMEM address decode error
[ 7760.023479] mc-err: [mcerr] status = 0x20010031; addr = 0x00000000
[ 7760.030281] mc-err: [mcerr] secure: no, access-type: write, SMMU fault: none
Does anyone have any idea what this is?
Thanks
Stephen