One of the few things in the Debian (yes...) setup guide was emphasizing ashift, I remember explicitly setting it to 12.
It's not a laptop, it's a low-end motherboard currently serving as my primary workhorse :) (until I find the money to fix the issues preventing me from working... any day now... :'D). *Checks* It's an ASUS P8H61-M. And no, the disks are directly attached.
TIL ZFS can submit different IO sizes than what reach the disks. I've just been dumbly staring at iotop and thinking that was the last word on the situation. Now to figure out how to get that info from ZFS (and figure out which bcc script to use). Thanks.
Thanks for the layer consideration. The application layer (an ncdu scan I'm currently doing is has been reading 60 files/second for days) and VFS/cache layer (if I do two apt operations in relatively quick succession (seconds apart) with nothing else doing I/O, the second one completes the read step instantly) seem to be the effect/symptom, with file system (all ZFS, but obviously badly tuned) and IO elevator (oooooh that's what that is TIL, I might play with this! :D) seemingly the most interesting, and HBA (onboard SATA3 port *hides*) and disk firmware (I've never upgraded a BIOS in case I irreparably break something lol) beyond the horizon somewhat.
It's not a laptop, it's a low-end motherboard currently serving as my primary workhorse :) (until I find the money to fix the issues preventing me from working... any day now... :'D). *Checks* It's an ASUS P8H61-M. And no, the disks are directly attached.
TIL ZFS can submit different IO sizes than what reach the disks. I've just been dumbly staring at iotop and thinking that was the last word on the situation. Now to figure out how to get that info from ZFS (and figure out which bcc script to use). Thanks.
Thanks for the layer consideration. The application layer (an ncdu scan I'm currently doing is has been reading 60 files/second for days) and VFS/cache layer (if I do two apt operations in relatively quick succession (seconds apart) with nothing else doing I/O, the second one completes the read step instantly) seem to be the effect/symptom, with file system (all ZFS, but obviously badly tuned) and IO elevator (oooooh that's what that is TIL, I might play with this! :D) seemingly the most interesting, and HBA (onboard SATA3 port *hides*) and disk firmware (I've never upgraded a BIOS in case I irreparably break something lol) beyond the horizon somewhat.
Thanks for the info!