Hi Mikulas, Got around to checking the patches today, apologies for the delay. On Monday, 26 April 2021 17:33:32 CEST Mikulas Patocka wrote: > I tried it on my nvme device (Samsung SSD 960 EVO 500GB) and I could > discard 32GB in 5 seconds. > > I assume that it is specific to the nvme device you are using. The device > is perhaps slow due to a mix of dicard+read+write requests that > dm-integrity generates. This makes sense to me as well. > Could you try it on other nvme disks? I cannot myself personally, but I asked a friend with Crucial P5 NVMe SSD to test and there the discards passed through dm-integrity are also well performing, so it seems specific so Seagate FireCuda 520. I contacted Seagate about this problem with some refs and reproduction steps, hopefully they will resolve this in a firmware update or I will have to return the drives eventually. (The worst part is all I/O blocks hard while handling integrity discards, causing really system freeze like experience.) Thanks, -- Melvin Vermeeren Systems engineer
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