I'm copying this to -hackers as well.
I tried setting the MD_NSECT to 307200 to accomodate my RAM disk, but
according to md(4):
At boot time the md driver will search for pre-loaded modules of type
`md_image' and instantiate a md device for each of these modules. The
type `mfs_root' is also allowed for backward compatibility. These
devices are backed by the RAM reserved by the loader(8), and as such not
limited by the malloc(9) size constraints.
I am preloading the images using the md_image variable in loader.conf, so
this documentation thinks I *should* be fine.
The kernel with MD_NSECT set to 307200 still failed to boot with my 128MB
md_image.
I'm attaching my kernel config.
-nick
On Mon, Sep 23, 2002 at 02:08:11PM -0400, Lowell Gilbert wrote:
Nicholas Esborn [EMAIL PROTECTED] writes:
I've tried this on two machines:
1 4.7-RC w/ 512 MB of RAM
2 5.0-CURRENT w/ 256 MB of RAM
Both behave the same way with a ~128MB md_image.
Did you check the manual? It says: The default maximum size of a md
disk backed by malloc(9) is 20,000 sectors of 512 bytes each. This
can be changed with the kernel option MD_NSECT.
-nick
On Sun, Sep 22, 2002 at 11:19:18AM -0700, Kris Kennaway wrote:
On Sun, Sep 22, 2002 at 01:11:20AM -0700, Nicholas Esborn wrote:
Hello,
I've been trying to boot a kernel and a preloaded md_image of about 128MB.
The kernel and image load, and then about a quarter of a second after the
kernel executes, before any text even prints, the machine reboots.
Has anyone had better luck with large md_image root filesystems?
You forgot to mention how much RAM you have, and what FreeBSD version.
--
Nicholas Esborn
Unix Systems Administrator
Berkeley, California
#
# COPPER
# Tue Apr 23 05:41:01 GMT 2002
# nick
#
# Based on $FreeBSD: src/sys/i386/conf/GENERIC,v 1.246.2.40 2002/03/27 02:16:26 dd Exp
$
machine i386
cpu I686_CPU
ident COPPERX
maxusers0
options HZ=1000 #increase clock resolution for polling
options INET#InterNETworking
options INET6 #IPv6 communications protocols
options FFS #Berkeley Fast Filesystem
options FFS_ROOT#FFS usable as root device [keep this!]
options SOFTUPDATES #Enable FFS soft updates support
options UFS_DIRHASH #Improve performance on big directories
options MFS #Memory Filesystem
options MD_ROOT #MD is a potential root device
options MD_NSECT=307200 #Maxium MD size
options NFS #Network Filesystem
options NFS_ROOT#NFS usable as root device, NFS required
options MSDOSFS #MSDOS Filesystem
options CD9660 #ISO 9660 Filesystem
options CD9660_ROOT #CD-ROM usable as root, CD9660 required
options PROCFS #Process filesystem
options COMPAT_43 #Compatible with BSD 4.3 [KEEP THIS!]
options SCSI_DELAY=15000#Delay (in ms) before probing SCSI
options UCONSOLE#Allow users to grab the console
options USERCONFIG #boot -c editor
options VISUAL_USERCONFIG #visual boot -c editor
options KTRACE #ktrace(1) support
options SYSVSHM #SYSV-style shared memory
options SYSVMSG #SYSV-style message queues
options SYSVSEM #SYSV-style semaphores
options P1003_1B#Posix P1003_1B real-time extensions
options _KPOSIX_PRIORITY_SCHEDULING
options ICMP_BANDLIM#Rate limit bad replies
options KBD_INSTALL_CDEV# install a CDEV entry in /dev
options CPU_ENABLE_SSE
options CPU_ATHLON_SSE_HACK
#optionsBOOTP
#optionsBOOTP_NFSROOT
#optionsBOOTP_NFSV3
#optionsBOOTP_COMPAT
options IPSEC
options IPSEC_ESP
options IPSEC_DEBUG
options IPFILTER
options IPFILTER_LOG
options DEVICE_POLLING
device isa
device pci
# Floppy drives
device fdc0at isa? port IO_FD1 irq 6 drq 2
device fd0 at fdc0 drive 0
# ATA and ATAPI devices
device ata
device atadisk # ATA disk drives
device atapicd # ATAPI CDROM drives
device atapifd # ATAPI floppy drives
device atapist # ATAPI tape drives
options ATA_STATIC_ID #Static device numbering
# SCSI Controllers
device ahc # AHA2940 and onboard AIC7xxx devices
# SCSI peripherals
device scbus #
