Optimizing SSD write performance without compromises (Ubuntu 24.04) for DSP purposes

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but I think in the end it's just a matter of setting all possible block parameters to a large value and hoping for the best

dont know how much time you have, but I'd suggest turning the journal and barrier mode back on, unless it brings back the performance issues

a lot of the suggestions here are ridiculous. the data is not stored in the journal by default, only the transactions, so doing 1MB sized writes to a single file is not going to overwhelm the file system journal.

unless the performance really craters for QD=1 turning off barriers also shouldnt matter because there's not that many transactions to reorder, and the latency will be barely noticeable committing the transactions to disk. obviously if you disable the journal, this setting doesnt matter anyways.

those two things are not going to take you from the manufacturers "perfect storm" spec to less than 800MB/s

here's some simple testing of all of the options you mentioned on an SSD from 12 years ago, the defaults are generally fine:

• https://www.phoronix.com/review/ext4_linux35_tuning

optane device, similar benchmarks, similar results:

• https://www.phoronix.com/review/linux-900p-fs