M.2 NVMe Disk preformance question (RPI-5 16gig)

[webbsmurfen]

I got an M.2 WD SSD Blue SN580 250GB (PCIe 4.0)NVMe connected, however i expected it to preform closer to 500MB/sec,
Is there a way to get more preformance out of that one lane PCIe 2.0

No changes done in config.txt. Everything is on auto. Booting from disk

[thagrol]

You're seeing better performance than I'm getting.

Code: Select all

Non-Volatile memory controller: Hosin Global Electronics Patriot P300 NVMe SSD (DRAM-less)

pi@devpi:~ $ sudo hdparm -t --direct /dev/nvme0n1

/dev/nvme0n1:
 Timing O_DIRECT disk reads: 1202 MB in  3.00 seconds = 400.10 MB/sec

Have you tried forcing PCIe gen3 in config.txt?

edited for typo

[webbsmurfen]

Your seeing better performance than I'm getting.

Code: Select all

Non-Volatile memory controller: Hosin Global Electronics Patriot P300 NVMe SSD (DRAM-less)

pi@devpi:~ $ sudo hdparm -t --direct /dev/nvme0n1

/dev/nvme0n1:
 Timing O_DIRECT disk reads: 1202 MB in  3.00 seconds = 400.10 MB/sec

Have you tried forcing PCIe gen3 in config.txt?

No, thanks for reminding me. It´s "dtparam=pciex1_gen=3" right?

[webbsmurfen]

Well.. That changes things .. A lot actually!! However it seems to work fine for now, but how to check for errors.

Im a bit sceptic about those numbers, however its an Gen4 disk, so maybe.. However can the Raspberry PI handle that amount of data on that single 1x lane?

[thagrol]

Well.. That changes things.. A lot actually!! However it seems to work fine for now, but how to check for errors.

i dont want to trash that disk

Checking your logs/systemd journal/dmesg output and running the occasional fsck is where I'd start.

[thagrol]

Im a bit sceptic about those numbers, however its an Gen4 disk, so maybe.. However can the Raspberry PI handle that amount of data on that single 1x lane?

Probably. Otherwise wouldn't it have reported a lower figure?

[kerry_s]

those are pretty much the numbers i would expect
i just turned on gen3 this mourning