Proc/Mtrr; Proc/Partitions - Red Hat ENTERPRISE LINUX 5 - DEPLOYMENT Deployment Manual

Chapter 3. The proc File System
/dev ramfs rw 0 0
/dev/mapper/VolGroup00-LogVol00 / ext3 rw 0 0
none /dev ramfs rw 0 0
/proc /proc proc rw,nodiratime 0 0
/sys /sys sysfs rw 0 0
none /dev/pts devpts rw 0 0
usbdevfs /proc/bus/usb usbdevfs rw 0 0
/dev/hda1 /boot ext3 rw 0 0
none /dev/shm tmpfs rw 0 0
none /proc/sys/fs/binfmt_misc binfmt_misc rw 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw 0 0
The output found here is similar to the contents of /etc/mtab, except that /proc/mount is more up-
to-date.
The first column specifies the device that is mounted, the second column reveals the mount point, and
the third column tells the file system type, and the fourth column tells you if it is mounted read-only
(ro) or read-write (rw). The fifth and sixth columns are dummy values designed to match the format
used in /etc/mtab.

3.2.23. /proc/mtrr

This file refers to the current Memory Type Range Registers (MTRRs) in use with the system. If the
system architecture supports MTRRs, then the /proc/mtrr file may look similar to the following:
reg00: base=0x00000000 (
reg01: base=0xe8000000 (3712MB), size=
MTRRs are used with the Intel P6 family of processors (Pentium II and higher) and control processor
access to memory ranges. When using a video card on a PCI or AGP bus, a properly configured /
proc/mtrr file can increase performance more than 150%.
Most of the time, this value is properly configured by default. More information on manually configuring
this file can be found locally at the following location:
/usr/share/doc/kernel-doc-<version>/Documentation/mtrr.txt

3.2.24. /proc/partitions

This file contains partition block allocation information. A sampling of this file from a basic system
looks similar to the following:
major minor #blocks
3 0 19531250 hda
3 1 104391 hda1
3 2 19422585 hda2
253 0 22708224 dm-0
253 1 524288 dm-1
Most of the information here is of little importance to the user, except for the following columns:
• major — The major number of the device with this partition. The major number in the /proc/
partitions, (3), corresponds with the block device ide0, in /proc/devices.
28
0MB), size= 256MB: write-back, count=1
32MB: write-combining, count=1
name