AGX test SSD read and write speed is too low

[jiachang.li]

PCIE4.0 X 4 read and write SSD speed is too low

[jiachang.li]

use this web :New SSD , slow write rate - #12 by DaneLLL

fio test: result output same as nvme_read_write

[DaneLLL]

Hi,
We would expect direct read/write can achieve target performance. Do you connect the NVMe SSD card to AGX Orin developer kit with Jetpack 5.1.3 and run the test? And which Jetpack version you are using?

[jiachang.li]

We use Jeston’s Agx Orin core board, and we have made our own motherboard. Currently, the software version is Jetpack 35.4.1

[jiachang.li]

Please help to review this issue again

[DaneLLL]

Hi,
Please try the command and share the result for reference:

// Direct write
$ sudo su
# echo 3 > /proc/sys/vm/drop_caches
# fio --filename=/mnt/testfile2 --direct=1 --rw=write --bs=10m --iodepth=64 --size=60G --numjobs=1 --time_base=1 --group_reporting --name=test-seq-write --ioengine=sync

// Buffer write
$ sudo su
# echo 3 > /proc/sys/vm/drop_caches
# fio --filename=/mnt/testfile2 --direct=0 --rw=write --bs=10m --iodepth=64 --size=60G --numjobs=1 --time_base=1 --group_reporting --name=test-seq-write --ioengine=sync

On AGX Orin developer kit + Samsung 2TB NVMe SSD card, direct write is 3735MiB/s and buffer write is 1145MiB/s

[jiachang.li]

The command you provided did indeed increase the speed. Now there is another issue, why is the link speed displayed as PCIE3.0 when connecting to a PCIE4.0 x4 SSD

[jiachang.li]

This is the detail of NVIDIA’s PCIE’s bridge

[DaneLLL]

Hi,
Please run the fio commands and see if you can achieve similar throughput as the Samsung NVMe SSD card. Ideally any card should have similar throughput while running the commands.