History of FuguIta/BBS/13(No. 1)

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- TMPFS optionally enabled at 202212191

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TMPFS optionally enabled at 202212191†

kaw (2022-12-19 (Mon) 15:35:41)

A few weeks ago, a fix was committed for kernel panics caused by TMPFS operations.
https://marc.info/?l=openbsd-cvs&m=166853221306810&w=2

Therefore, in this release FuguIta-*-202212191, TMPFS is now enabled on the FuguIta kernel.

At boot time, /ram is mounted with MFS as before, but to enable TMPFS mounting instead, rewrite the value of memfstype in the system image file fuguita-7.2-ARCH.ffsimg.
The procedure is as follows

To modify LiveUSB, on running FuguIta LiveUSB:
# mount -uw /sysmedia
# mount -uw /fuguita
# sed -i.bak -e '/memfstype=/s/=mfs/=tmpfs/' /fuguita/etc/fuguita/global.conf   <-- or use your preferred editor
# cat /fuguita/etc/fuguita/global.conf 
fuguita_sys_mb=1010  # size of media.img
memfstype=tmpfs        # 'mfs' or 'tmpfs'  <-- make sure memfstype is set to tmpfs
mfs_max_mb=30720     # mfs hard limit - 30GB
# mount -ur /fuguita
# mount -ur /sysmedia
# reboot
To generate modified ISO image, on running FuguIta LiveUSB or LiveDVD:
# cd /
# pax -rwpe sysmedia WORKDIR  <-- WORKDIR is the directory that can have the capacity more than about 2GB
# cd WORKDIR/sysmedia
# vnconfig vnd0 fuguita-7.2-amd64.ffsimg
vnd0
# mount /dev/vnd0a /mnt
# sed -i.bak -e '/memfstype=/s/=mfs/=tmpfs/' /mnt/etc/fuguita/global.confg  <-- or use your preferred editor
# cat /mnt/etc/fuguita/global.conf
fuguita_sys_mb=1010  # size of media.img
memfstype=tmpfs	       # 'mfs' or 'tmpfs'  <-- make sure memfstype is set to tmpfs
mfs_max_mb=30720     # mfs hard limit - 30GB
# umount /mnt
# vnconfig -u vnd0
# remaster_dvd.sh  <-- generate ISO image
mkhybrid 1.12b5.1
Scanning .
Scanning ./etc

Size of boot image is 4 sectors -> No-emulation CD boot sector
Total translation table size: 0
Total rockridge attributes bytes: 1028
Total directory bytes: 2048
Path table size(bytes): 22
512769 extents written (1001 Mb)
# ls -l ..  <-- the ISO image is generated at parent directory
total 2052114
-rw-r--r--  1 root  wheel  1050150912 Dec 18 06:13 FuguIta-7.2-amd64-202212181.iso
drwxr-xr-x  3 root  wheel	  512 Oct 22 17:09 sysmedia
When booting with modified media, size of tmpfs is prompted.
available memory: 239M

Enter tmpfs size (0M is auto).
  You can add suffix K, M, or G.
  % is a percentage of memory size.
  and %% is a percentage of the total memory and swap.
  otherwise considered "megabytes"

[default: 0M] ->
set tmpfs size to 0MB
With the procedures described above, you can use FuguIta with TMPFS. Although note that TMPFS is not completely stable. TMPFS may cause kernel panic when it is heavily being paged out and in. For example, this problem can be reproduced by executing following test script.
#!/bin/sh

# test directory located in tmpfs
#
testdir=/ram  # in case of FuguIta
cd $testdir || exit 1

df -h
swapctl -lk

blk=64  # block size of dd write in MB
i=1
while [[ $(df -h | awk '$6 ~ /\/ram$/ { print 0+$5 }') < 95 ]]; do
    echo "====trying ${i}*${blk}MB ===="
    dd if=/dev/zero of=zerofill_${i} bs=1m count=$blk || break
    df -h
    swapctl -lk
    i=$((i+1))
done
Click to enlarge

Former articles are at FuguIta/BBS/12.

History of FuguIta/BBS/13 (No. 1)

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TMPFS optionally enabled at 202212191†