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MFS slow when writing many files to usb-memory

Question asked by Carl-Magnus Moon on Jun 11, 2015
Latest reply on Feb 8, 2018 by patrick caujan,

I am Writing log files to an usb-memory using MFS and the usb-host stack in MQX 4.2. The files are 1.6Mb each. The tests are performed on a TWR-KF120 board using Sandisk Cruzer Blade 8GB usb-memories.


It starts out pretty good with a write speed of about 500kB/s. However, the performance degrades to half after a couple of hundred files and after like 1000 files it is down to 40kB/s. Is this normal? It seems to me that MFS gets very slow when the usb-memory starts to fill up.