IO_Wait when downloading torrents to cache SSD

[removinggoose]

Hi, I am getting high IO_Wait when downloading torrents directly to my cache drive. I have all drives in the array spun down to ensure nothing is using them instead. None of the disks spin up so I am able to confirm that only the ssd is being used.

 

Download speeds are usually 45 MiB/s but suddenly drop to 4 MiB/s with high IO_Wait and then speed back up.

 

IO_wait also happens during unpacking in SABnzbd

 

perhaps nvme pcie ssd would fix it? I only recently upgraded the motherboard so now have that as an option

 

CPU: Ryzen 5 5600g

16gb ddr4

Kingston SATA SSD

 

[BRiT]

Is preallocation for full size of download enabled in your torrent software?

[removinggoose]

It wasn't but I just added it and then started a new download, ensuring it was checked. Seems to be more stable but a couple times still slowed down massively with 53 and 71 percent IO_Wait

[removinggoose]

I have noticed that when the torrent slows down, cpu looks like this

[removinggoose]

Ok so I changed it to Cache - no and started a new torrent. 35gb download and never went under 50MiB/s no crazy CPU load. So I need to figure out why downloading to the SSD causes crazy CPU load randomly. When I had a low power system, changing the mount folder to /mnt/cache helped with speeds but surely with a ryzen 5600g and 16gb ram, I shouldn't be seeing one single torrent maxing out cores?

[removinggoose]

I see that it is possible to change the cache drive to xfs. do you think this is worth trying?