severity 987316 minor thanks On Wed, 21 Apr 2021, Roger Lynn wrote:
> Thanks for the clarification. I think that reduces this bug to "Why is my > tmpfs set to 20% of physical RAM rather than 20% of total virtual memory?" There’s a difference betwen setting it to 20% and to 20%VM. The default value is 20%VM though. tmpfs_size_vm uses vm_size which combines RAM and swap size and calculates a size in KiB based on it (with some extra rounding down due to dividing by 100 first in order to stay within values shell arithmetic can do without UB). However ram_size and swap_size rely on /proc/meminfo, grep and a pretty involved sed command, which can even fail badly, as it doesn’t use sed -n. If anything fails in calculating vm_size, or if using 20% instead of 20%VM, the value is passed as '20%' instead of a size in KiB to mount, so the kernel will do the rest. I think our best bet to tracking this down would be: • add “set -x” as first and “set +x” as last line to /lib/init/tmpfs.sh • perhaps also add “grep Total /proc/meminfo” in there for extra debugging • reboot with serial console, so we can actually capture all the debug messages I suspect one of the operations involved fails for you, or swap is initialised later. Hrm. I have TMP_SIZE=80%VM in my /etc/default/tmpfs and I get… $ df -k Filesystem 1K-blocks Used Available Use% Mountpoint tmpfs 6458640 3624664 2833976 57% /tmp $ fgrep Total /proc/meminfo MemTotal: 8073324 kB SwapTotal: 3206140 kB Okaaay, I guess I can reproduce this. Then I can probably debug this in a VM, as to easier get serial console (I do have a physical serial port, but…). > (And the rewording of the manual page would be nice too.) Agreed, but I believe this is now of minor severity. If nobody complains I’ll commit that change for the next regular upload. bye, //mirabilos -- Infrastrukturexperte • tarent solutions GmbH Am Dickobskreuz 10, D-53121 Bonn • http://www.tarent.de/ Telephon +49 228 54881-393 • Fax: +49 228 54881-235 HRB AG Bonn 5168 • USt-ID (VAT): DE122264941 Geschäftsführer: Dr. Stefan Barth, Kai Ebenrett, Boris Esser, Alexander Steeg ************************************************* Mit dem tarent-Newsletter nichts mehr verpassen: www.tarent.de/newsletter *************************************************
