Re: starting qemu: shm problem
On Fri, Nov 24, 2006 at 12:05:06PM +0100, Mirto Silvio Busico wrote: Hi all, I'm trying to star qemu but I have problems. I'm using Etch and qemu 0.8.1-1 When I try to start I receive an error message stating that I have not enough shared memory. the mount command says: devshm on /dev/shm type tmpfs (rw) If I do what qemu suggest: umount /dev/shm mount -t tmpfs -o size=144m none /dev/shm the emulation starts correcty Here my questions: 1. is this the expected behaviour? 2. where can I find documentation about shm device and temporary file systems? For a start, you can read the comments in /etc/init.d/mountvirtfs 3. how can I change the shm device? Create an /etc/default/tmpfs containing the line TMPFS_SIZE=144M The default size is half of available memory, so I suppose your system has 256M or less? -- All I want is a warm bed and a kind word and unlimited power. -- Ashleigh Brilliant -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: starting qemu: shm problem
Bill Marcum wrote:
On Fri, Nov 24, 2006 at 12:05:06PM +0100, Mirto Silvio Busico wrote:
Hi all,
I'm trying to star qemu but I have problems.
I'm using Etch and qemu 0.8.1-1
When I try to start I receive an error message stating that I have not
enough shared memory.
the mount command says:
devshm on /dev/shm type tmpfs (rw)
If I do what qemu suggest:
umount /dev/shm
mount -t tmpfs -o size=144m none /dev/shm
the emulation starts correcty
Here my questions:
1. is this the expected behaviour?
2. where can I find documentation about shm device and temporary file
systems?
For a start, you can read the comments in /etc/init.d/mountvirtfs
Well, in my /etc/init.d/ directory there is no such file.
A grep of shm in this directory says:
=
msb01:/etc/init.d# grep shm *
checkroot.sh: domount tmpfs shmfs /tmp \
mountdevsubfs.sh: # Mount a tmpfs on /dev/shm
mountdevsubfs.sh: domount tmpfs shmfs /dev/shm
-onoexec,nosuid,nodev$SHM_OPT
mtab.sh:# /dev/pts and /dev/shm.
mtab.sh:domtab tmpfs /dev/shm devshm $SHM_OPT
udev: if mountpoint -q /dev/shm/; then
udev:umount -n -l /dev/shm/
umountfs: /|/proc|/dev|/.dev|/dev/pts|/dev/shm|/proc/*|/sys)
umountnfs.sh: /|/proc|/dev|/dev/pts|/dev/shm|/proc/*|/sys)
msb01:/etc/init.d#
=
So, looking at mountdevsubfs.sh (there is no great comment inside) I see:
=
TMPFS_SIZE=
[ -f /etc/default/tmpfs ] . /etc/default/tmpfs
KERNEL=$(uname -s)
. /lib/lsb/init-functions
. /lib/init/mount-functions.sh
do_start () {
#
# Mount a tmpfs on /dev/shm
#
SHM_OPT=
[ ${SHM_SIZE:=$TMPFS_SIZE} ] SHM_OPT=,size=$SHM_SIZE
domount tmpfs shmfs /dev/shm -onoexec,nosuid,nodev$SHM_OPT
=
Looking at /etc/default/tmpfs I find a file containing:
=
# SHM_SIZE sets the maximum size (in bytes) that the /dev/shm tmpfs can use.
# If this is not set then the size defaults to the value of TMPFS_SIZE
# if that is set; otherwise to the kernel's default.
#
# The size will be rounded down to a multiple of the page size, 4096 bytes.
SHM_SIZE=
=
That explains the size determination.
3. how can I change the shm device?
Create an /etc/default/tmpfs containing the line
TMPFS_SIZE=144M
The default size is half of available memory, so I suppose your system
has 256M or less?
Yes it have 256Mb
Thanks for your help
Mirto
--
__
Mirto Silvio Busico ICT Consultant
Tel. +39 333 4562651
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starting qemu: shm problem
Hi all, I'm trying to star qemu but I have problems. I'm using Etch and qemu 0.8.1-1 When I try to start I receive an error message stating that I have not enough shared memory. the mount command says: devshm on /dev/shm type tmpfs (rw) If I do what qemu suggest: umount /dev/shm mount -t tmpfs -o size=144m none /dev/shm the emulation starts correcty Here my questions: 1. is this the expected behaviour? 2. where can I find documentation about shm device and temporary file systems? 3. how can I change the shm device? Thanks Mirto -- __ Mirto Silvio Busico ICT Consultant Tel. +39 333 4562651 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: starting qemu: shm problem
Hello. Mirto Silvio Busico, 24.11.2006 12:05: I'm trying to star qemu but I have problems. I'm using Etch and qemu 0.8.1-1 When I try to start I receive an error message stating that I have not enough shared memory. You could start the VM with less memory. the mount command says: devshm on /dev/shm type tmpfs (rw) If I do what qemu suggest: umount /dev/shm mount -t tmpfs -o size=144m none /dev/shm the emulation starts correcty Here my questions: 1. is this the expected behaviour? If your shared memory is to little, yes. 3. how can I change the shm device? In your /etc/fstab; here is my entry: # file system mount point type options dump pass none/dev/shmtmpfs defaults,size=528M Regards, Mathias -- debian/rules signature.asc Description: OpenPGP digital signature
