How can I increase downloading speeds for FTP on NetX Duo?

[Hey0256]

Hello, everyone on the forum.
I'm building a system using the STM32H735G-DK, ThreadX, and NetX Duo.

I'm writing logs to a microSD card to keep a record of the system's operation.

I integrated FTP into the system so that log files can be downloaded via Ethernet.

Since the FTP download speed is only about 150 kilobytes per second, it takes a long time to download large log files.
Currently, `nx_ftp_server_create` allocates an 8K-byte stack for the FTP server.

 

What are some ways to increase FTP download speeds?
I would appreciate any advice.

 

[SAHSTM]

Hello ​@Hey0256,

Thank you for your report.

The FTP server stack size is usually not the main limiting factor for download speed. A throughput around 150 KB/s does not, by itself, identify the root cause. The bottleneck can be in the storage path, the network path, or their interaction.

To isolate the bottleneck, first run two measurements:

• Raw fx_file_read() throughput from microSD to RAM (no network transfer)
• Raw TCP throughput from RAM buffer to Ethernet (no FileX access)

These two tests help determine whether the limit is storage-related, network-related, or system-wide.

If raw file reads are slow, investigate SDMMC DMA mode, D-Cache/MPU configuration, and 512-byte aligned accesses.
If raw TCP is fast, tune NetX packet pool sizing, FTP data window size, transmit queue depth, and Ethernet DMA descriptor counts.

 

With Regards,