On 27.10.21 15:41, Joakim Tjernlund wrote: > On Wed, 2021-10-27 at 14:35 +0100, Matthew Wilcox wrote: >> On Wed, Oct 27, 2021 at 12:48:13PM +0000, Joakim Tjernlund wrote: >>> Linux version 5.11.0 >>> Memory: 24052K/32768K available (3520K kernel code, 684K rwdata, 548K rodata, 320K init, 245K bss, 8716K reserved, 0K cma-reserved) >>> >>> Versus: >>> >>> Linux version 5.10.75 >>> Memory: 11836K/32768K available (3518K kernel code, 684K rwdata, 540K rodata, 320K init, 244K bss, 20932K reserved, 0K cma-reserved) >> >> ... you're complaining that we reduced the amount of reserved ram? >> You know that 5.11.0 is more recent than 5.10.75, right? > > Sort of :) > No kernel I have used earlier has reserved so much RAM in the past so I figure that > 20 MB in 5.10 is a regression. > > Reason for using 5.10 is that it is an LTS kernel that will be around for quite a while. Do you have any comparison against older v5.10 kernels -- IOW, is it a regression within the LTS kernels or has it "simply been optimized" starting with v5.11 ? (a lot of things count as reserved, including the initial ramdisk until eventually freed, but I assume your setup really just exchanges the kernel) -- Thanks, David / dhildenb
