Linux 5.15 Addressing Scalability Issue That Caused Huge IBM Servers 30+ Minutes To Boot

[chuckula]

Making matters worse is that with the 64TB of system memory and IBM Power dividing them into 256MB local blocks exposed via sysfs, a heck of a lot of sysfs nodes are being created.

256,000 [edit: or 262,144 FOR YOU NERDS] sysfs nodes oughta be enough for anybody.

But seriously, why do RAM chunks even need to be referenced via sysfs in the first place?

[phoronix]

Phoronix: Linux 5.15 Addressing Scalability Issue That Caused Huge IBM Servers 30+ Minutes To Boot

Very large IBM mainframes/servers were taking 30+ minutes to boot the Linux kernel... No, just not for POST'ing the system with memory training and the like, but for loading Linux. Fortunately, with the Linux 5.15 kernel there is a set of scalability enhancements to allow these large IBM systems to be able to boot in around five minutes...

https://www.phoronix.com/scan.php?page=news_item&px=Linux-5.15-Kernfs-Scalability