* Aaron Thompson <dev@xxxxxxxxxx> wrote: > > On 2023-01-05 02:48, Ingo Molnar wrote: > > * Aaron Thompson <dev@xxxxxxxxxx> wrote: > > > > > For example, on an Amazon EC2 t3.micro VM (1 GB) booting via EFI: > > > > > > v6.2-rc2: > > > # grep -E 'Node|spanned|present|managed' /proc/zoneinfo > > > Node 0, zone DMA > > > spanned 4095 > > > present 3999 > > > managed 3840 > > > Node 0, zone DMA32 > > > spanned 246652 > > > present 245868 > > > managed 178867 > > > > > > v6.2-rc2 + patch: > > > # grep -E 'Node|spanned|present|managed' /proc/zoneinfo > > > Node 0, zone DMA > > > spanned 4095 > > > present 3999 > > > managed 3840 > > > Node 0, zone DMA32 > > > spanned 246652 > > > present 245868 > > > managed 222816 # +43,949 pages > > > > [ Note the annotation I added to the output - might be useful in the > > changelog too. ] > > > > So this patch adds around +17% of RAM to this 1 GB virtual system? That > > looks rather significant ... > > > > Thanks, > > > > Ingo > > It is significant, but I wouldn't describe it as being added. I would say > that the system is currently losing 17% of RAM due to a bug, and this patch > fixes that bug. To the end-user gaining +17% [or +3%] extra usable RAM compared to what they had before is what matters, and it's a big deal. :-) Thanks, Ingo
