New CRAM method offers giant boost to compressed memory reads

Kevin_Flynn | 9 hours ago

Ram Doubler, for Mac and Win 3.x, 1996

https://winworldpc.com/product/connectix-ram-double/windows-...

Nice to see its back, with better performance.

History repeated, with refinement.

vfosnar | 7 hours ago

https://www.phoronix.com/news/Linux-CRAM-Compressed-RAM

x0z | 6 hours ago

Thank you <3

dang | 3 hours ago

Added above. Thanks!

eglintondust | 7 hours ago

So can I finally download more RAM?

smallmancontrov | 2 hours ago

https://downloadmoreram.com/

Whoa, new options! I'm downloading the Quantum RAM with Haptic Feedback.

swed420 | 2 hours ago

You wouldn't download a car

skavi | 2 hours ago

probably not to your current computer. this works on supporting memory types that do compression in hardware.

madduci | 7 hours ago

Finally we can run frontier models locally

throawayonthe | 5 hours ago

one would hope model weights are already high entropy enough and would not be improved by a general-purpose memory compression algo?

sroussey | 2 hours ago

We brute force AI models right now because a) we don’t know better, and b) it’s premature optimization.

I beg to differ on point b, but no one is delaying their next model just so they can concentrate on optimization.

It’s coming though.

One example: https://siliconangle.com/2026/07/28/ai-model-compression-sta...

Another is separating the the intelligence part of the model from the known facts part of the model (which can be better compressed)

tintor | 2 hours ago

Compression doesn't really work for model weights.

Model quantization and model distillation are two techniques to reduce model size.

cwillu | 7 hours ago

The article appears to misunderstand the point of the project, and mostly just describes what zswap already does (writing compressed pages back into ram), rather than talking about cram's hardware-offloaded compression that allows cacheline-level access rather than page-level. (And they appear to be aware that they don't really understand it: “My explanation of CRAM might not be completely correct”)

The phoronix article is better, and I say that as someone who usually detests the quality of phoronix's technical writing.

tancop | 4 hours ago

It's not really about hardware offload, the biggest problem with zswap is that it's swap. The rest of the kernel treats it like a fast SSD (which is still incredibly slow compared to RAM) instead of slower memory that needs a bit of special handling on writes.

NUMA maps a lot closer to what compressed RAM actually is. The subsystem is more aware of CRAMs specifics so it can make better decisions about where to put allocations and everything gets faster. And it's less overhead because swap is not really optimized for frequent direct access but for NUMA it's the most basic function.

cyberclimb | 4 hours ago

the recording of the presentation has got to be on this YT channel but I only scrubbed through 2 videos (8h each) and it's not easy to find

https://www.youtube.com/@LinuxPlumbersConference

not sure where it falls in the schedule here either https://lpc.events/event/20/timetable/#all

tux3 | 2 hours ago

Unfortunately the recording is missing audio for half the talk. A frequent issue for the plumbers livestreams this year.

https://www.youtube.com/live/OPRciCSsdS4?t=2031

cyberclimb | 2 hours ago

Legend! Thanks for digging it up