this post was submitted on 07 Apr 2024
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unused is wasted (lemmy.world)
submitted 4 months ago by [email protected] to c/[email protected]
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this is right after closing qemu-kvm

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[–] [email protected] 1 points 4 months ago (2 children)

I was wondering if the extra layer of whatever filesystem the swap file is created on creates overhead? Also i think some filesystems that do COW can negatively impact performance or something? Kind of remember reading that.

[–] [email protected] 1 points 4 months ago

For swap files on btrfs COW and features like compression have to be disabled. I believe for btrfs the swap file even has to sit on a subvolume with those features disabled, so it's not enough to only disable them for the swap file.

[–] [email protected] 1 points 4 months ago

I've never noticed an appreciable performance hit, but I also don't generally swap much. Most of the time on a desktop/workstation I'm surprised to see a gig or 2 in swap. Nvme drives are pretty fast. If you are actually using swap space on a regular basis it might be worth it to upgrade RAM or use a dedicated drive for swap if necessary. I remember btrfs having swap file issues but the details are fuzzy, these days I use zfs on my nas and ext4 everywhere else.