Linux Patches Allow Changing Hibernation Compression Format For Better Performance

[phoronix]

Phoronix: Linux Patches Allow Changing Hibernation Compression Format For Better Performance

Currently when hibernating a Linux system LZO compression is used for preserving the memory contents while a new patch series posted today by Qualcomm allow for changing out the compression API used and makes LZ4 a new option during Linux hibernation...

https://www.phoronix.com/news/Linux-LZ4-Hibernation-Patches

[pkese]

Any idea on how to setup hybernate on a laptop with full disk encryption (dev mapper & cryptsetup)?

My partition setup is as explained in this article: https://blog.theodo.com/2022/01/disk...with-tutorial/

[skeevy420]

Any idea on how to setup hybernate on a laptop with full disk encryption (dev mapper & cryptsetup)?

My partition setup is as explained in this article: https://blog.theodo.com/2022/01/disk...with-tutorial/

It varies by distribution and how you install it. You either get what you get with the OS's installation tools or can do a lot more exotic setups from a Live environment by doing everything manually.

Based on the link you posted, I'm assuming Ubuntu XX.YY. I'm also assuming that since you're asking these questions that it'd probably be a lot easier for you to backup your $HOME data, get a list of anything you've installed (Snaps and Apt), and then reinstall the OS with Ubuntu's built-in stuff. Worst case scenario, buy an external HDD from Wal-Mart (or your country's equivalent) and return it once you've backed up and restored your data because it's a "crappy" drive that "doesn't work". Those are questions you should query on the Ubuntu forums for better answers from people that use Ubuntu and know its tricks.

Speaking of returning products, I'm returning a circular saw to Lowe's today. Damn thing wouldn't cut a standard 2x4. Anything over 1" thick would jam it up. That's not a joke.

Do not buy the $80 20V Craftsman circular saw. It's actual junk. They shouldn't be allowed to make tools that shitty.

[openminded]

>>When switching over to LZO compression, the decompression rate jumped from 335 MB/s to 501 MB/s

Probably you meant LZ4

[Anux]

Was this tested on some low end ARM chip? Because I remember zstd reaching > 4000 MB/s and LZ4 should be even faster.

[bumblebritches57]

They’ve already got zstd in the linux tree, why not use that?

[stormcrow]

They’ve already got zstd in the linux tree, why not use that?

As people keep saying till their keyboards wear out from the typing every time this topic comes up, not every CPU Linux supports has the hardware instructions or resources necessary to make zstd a viable alternative in all cases.

[skeevy420]

As people keep saying till their keyboards wear out from the typing every time this topic comes up, not every CPU Linux supports has the hardware instructions or resources necessary to make zstd a viable alternative in all cases.

Not to mention that LZ4 is just faster by default. Zstd has to be tuned and configured for raw speed whereas that's LZ4's default. Plus the Linux kernel doesn't support tuning Zstd to LZ4 speeds. It stops at Zstd:1 and LZ4 is closer to Zstd:-5.

zstd 1.4.5 -1	2.884	500 MB/s	1660 MB/s
zlib 1.2.11 -1	2.743	90 MB/s	400 MB/s
brotli 1.0.7 -0	2.703	400 MB/s	450 MB/s
zstd 1.4.5 --fast=1	2.434	570 MB/s	2200 MB/s
zstd 1.4.5 --fast=3	2.312	640 MB/s	2300 MB/s
quicklz 1.5.0 -1	2.238	560 MB/s	710 MB/s
zstd 1.4.5 --fast=5	2.178	700 MB/s	2420 MB/s
lzo1x 2.10 -1	2.106	690 MB/s	820 MB/s
lz4 1.9.2	2.101	740 MB/s	4530 MB/s
lzf 3.6 -1	2.077	410 MB/s	860 MB/s
snappy 1.1.8	2.073	560 MB/s	1790 MB/s

That's why LZ4 is used. It's just faster than everything else in exchange for a slightly lower compression ratio.

And for anyone curious, those are the numbers from Zstd's site. If I was going to pick a biased data point in favor of Zstd, it'd be from them.

[QwertyChouskie]

Was this tested on some low end ARM chip? Because I remember zstd reaching > 4000 MB/s and LZ4 should be even faster.

Probably hitting a storage bottleneck at that point.

[Anux]

Probably hitting a storage bottleneck at that point.

With modern M.2 SSDs these are hardly the bottleneck. In fact I want my disk (de)compression to be massively faster than my storage because else the CPU is at 100% just for some I/O. And Encryption likewise.