Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsNo—not as a memory-management function. zram creates a compressed, RAM-backed block device that Linux can use as swap. It can replace a disk swap file or partition for some workloads, but it still uses physical memory, and zram by itself is not a disk-backed target for hibernation.
What zram does—and what “replace swap” can mean
Swap is a way for Linux to move less-active memory pages out of active use. zram is a kernel feature that creates a block device in RAM; pages written to it are compressed and stored in memory. The Linux kernel documentation describes it this way: “Pages written to these disks are compressed and stored in memory itself.” (Linux kernel zram documentation.)
That device can be initialized and activated as swap. So zram does not replace swap as a facility: it is one possible place to put swap. It can, however, replace a machine’s disk-backed swap file or partition if the system’s workload and needs allow it.
How zram differs from disk swap and zswap
| Mechanism | Where pages reside | Does it need disk-backed swap? | Practical distinction |
|---|---|---|---|
| Disk swap file or partition | On a storage device | No; it is the backing swap itself. | Can move pages out of RAM to storage; performance depends on the device and workload. |
| Swap on zram | Compressed in RAM, through a zram block device | No, for zram’s own swap operation. | Provides compressed swap capacity, but the stored pages still consume RAM. |
| zswap | In a compressed in-memory cache in the swap path; pages can be written out when the cache fills. | Yes, for writeback to backing swap. | Acts as a cache in front of a backing swap device rather than supplying a standalone swap device. |
The Linux kernel documents zram as a RAM-based compressed block device and zswap as a compressed cache that can write pages to backing swap. (zram documentation; zswap documentation.)
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Does zram give you more memory?
It can increase how much page data fits in memory, but its configured device size is not the same thing as extra physical RAM. The pages remain in RAM in compressed form, and the net saving depends on how compressible the workload is. Compression also uses CPU time.
Fedora’s 2020 swap-on-zram proposal illustrates the arithmetic with a hypothetical 16 GiB system and a 4 GiB zram device: if 4 GiB of page data compresses at a hypothetical 2:1 ratio, it occupies 2 GiB in RAM, for a net 2 GiB saving. That is an illustration, not a benchmark or guaranteed ratio. (Fedora Project proposal, updated 2020-10-13.)
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When zram can be a sensible substitute for disk swap
- Memory-constrained systems: Compressible pages may fit in RAM more efficiently than they would uncompressed.
- Systems using flash storage: zram may avoid some swap writes, though the benefit depends on the workload.
- Virtualized hosts: the Ubuntu
zramswapmanual lists these as a possible use case.
These are potential benefits, not guarantees. Ubuntu’s manual cautions that gains over a fast SSD can be marginal. Workloads with pages that do not compress well may see little net memory benefit, while CPU cost and the need to move pages fully out of RAM can favor disk swap. (Ubuntu Resolute zramswap manual, zram-tools 0.3.7-1build1.)
Can a zram-only system hibernate?
Do not treat zram as a disk-backed hibernation target. A zram device stores its contents in RAM, so it cannot serve as persistent storage for a hibernation image after power is removed. If hibernation is required, check the system’s hibernation requirements and configure an appropriate drive-backed swap target; zram and disk-backed swap can coexist.
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Fedora’s Fedora 33 proposal, last updated 2020-10-13, describes drive-backed swap being used for hibernation when present. That is a historical proposal, not a guarantee of current behavior across Fedora releases or other distributions. (Fedora Project proposal.)
How to check your system and configure zram
Distribution setup varies, so first check which swap devices are active and how your system configures them. The command sequence below follows the documented zramctl example; it is a reference flow, not a universal setup recommendation. Verify the distribution’s instructions and available devices before changing swap.
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- Create a zram device:
zramctl --find --size 1024M. - Set it up as swap:
mkswap /dev/zram0. - Activate it:
swapon /dev/zram0. - When removing or resetting it: run
swapoff /dev/zram0before resetting the device.
Those commands are from the util-linux zramctl manual (Ubuntu Jammy’s manual covers util-linux 2.37.2-4ubuntu3.6); options and packaging can differ by distribution and release. (Ubuntu Jammy zramctl manual.)
Do not assume a distribution’s default from an old proposal
Fedora’s 2020 Fedora 33 proposal described a planned zram device sized at 50% of RAM, capped at 4 GiB, and a plan not to create disk swap by default. Those figures describe that historical proposal, not Fedora’s current default. Check the active swap devices and the configuration for the specific distribution and release you use. (Fedora Project proposal, updated 2020-10-13.)
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