max number of slabs per kernel module (kernel 2.6.17, suse) Post: 302160416

Sponsored Content

Operating Systems Linux SuSE max number of slabs per kernel module (kernel 2.6.17, suse) Post 302160416 by Perderabo on Monday 21st of January 2008 08:29:37 PM

01-21-2008

Administrator Emeritus

There is no arbitrary limit on the number of slabs that a kernel routine (whether or not it is a module) can use, but no computer has an infinite amount of memory either. Zones are different than slabs. Memory locations have an address and not all addresses are identical in nature. This stuff varies greatly depending on the cpu. As an example, on a typical Pentium, ZONE_DMA memory has an addresss below 16 MB and is usable for DMA transfers. There are only a very few zones. This stuff is documented in "Understanding the Linux Kernel", by Bovet and Cesati, ISBN 0-596-00565-2.

Perderabo

View Public Profile for Perderabo

Find all posts by Perderabo

4 More Discussions You Might Find Interesting

1. Linux

How to convert Linux Kernel built-in module into a loadable module

Hi all, I am working on USB data monitoring on Fedora Core 9. Kernel 2.6.25 has a built-in module (the one that isn't loadable, but compiles and links statically with the kernel during compilation) to snoop USB data. It is in <kernel_source_code>/drivers/usb/mon/. I need to know if I can...

2. IP Networking

kernel module

Hi All, I need to develop a kernel module which changes the IP address of a package according to its mac address. It would be a sort of L2 Nat. Somebody know if I can do this using netfilter?? Thanks.

3. Linux

kernel module parameters

Hi, if I install a module with specific parameter, will this parameters applied next time system boots? for exampe, I want to disable InterruptThrottleRate modprobe e1000e InterruptThrottleRate=0 Is this parameter apllied only for this run, or this module will always use this parameter when...

4. Linux

Unload kernel module at boot time (Debian Wheezy 7.2, 3.2.0-4-686-pae kernel)

Hi everyone, I am trying to prevent the ehci_hcd kernel module to load at boot time. Here's what I've tried so far: 1) Add the following line to /etc/modprobe.d/blacklist.conf (as suggested here): 2) Blacklisted the module by adding the following string to 3) Tried to blacklist the module...

LEARN ABOUT DEBIAN

rpcdebug

rpcdebug(8)						      System Manager's Manual						       rpcdebug(8)

NAME

       rpcdebug - set and clear NFS and RPC kernel debug flags

SYNOPSIS

       rpcdebug -vh
       rpcdebug -m module
       rpcdebug -m module -s flags...
       rpcdebug -m module -c flags...

DESCRIPTION

       The  rpcdebug  command  allows an administrator to set and clear the Linux kernel's NFS client and server debug flags.  Setting these flags
       causes the kernel to emit messages to the system log in response to NFS activity; this is typically useful when debugging NFS problems.

       The first form in the synopsis can be used to list all available debug flags.  The second form shows the currently set debug flags for  the
       given module.  The third form sets one or more flags, and the fourth form clears one or more flags.

       The value all may be used to set or clear all the flags for the given module.

OPTIONS

       -c     Clear the given debug flags.

       -h     Print a help message and exit.  When combined with the -v option, also prints the available debug flags.

       -m module
	      Specify which module's flags to set or clear.  Available modules are:

	      nfsd   The NFS server.

	      nfs    The NFS client.

	      nlm    The Network Lock Manager, in either an NFS client or server.

	      rpc    The Remote Procedure Call module, in either an NFS client or server.

       -s     Set the given debug flags.

       -v     Increase the verbosity of rpcdebug's output.

FILES

       /proc/sys/sunrpc/{rpc,nfs,nfsd,nlm}_debug
	      procfs-based interface to kernel debug flags.

SEE ALSO

       rpc.nfsd(8), nfs(5), syslogd(8).

BUGS

       Bugs can be found or reported at http://nfs.sf.net/.

AUTHOR

       Program by Olaf Kirch <okir@suse.de> and <frederic.jolly@bull.ext.net>.	Manpage by Greg Banks <gnb@melbourne.sgi.com>.

								    5 Jul 2006							       rpcdebug(8)