Red Hat LINUX 7.2 Reference Manual page 84

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multcount
nice1
nowerr
number
pio_mode
slow
unmaskirq
using_dma
4.3.6 /proc/irq
This directory is used to set IRQ to CPU affinity, which allows you to connect a particular IRQ to only
one CPU. Alternatively, you can exclude a CPU from handling any IRQs.
Each IRQ has its own directory, allowing for each IRQ to be configured different from any other.
The /proc/irq/prof_cpu_mask file is a bitmask that contains the default values for the
smp_affinity file in the IRQ directory. The values in smp_affinity specify which CPUs
handle that particular IRQ.
More information is available in the /usr/src/linux-2.4/Documentation/filesys-
tems/proc.txt file.
4.3.7 /proc/net
This directory provides a comprehensive look at various networking parameters and statistics. Each
of the files covers a specific range of information related to networking on the system:
• arp — Contains the kernel's ARP table. This file is particularly useful for connecting hardware
address to an IP address on a system.
• atm — A directory containing files with various Asynchronous Transfer Mode (ATM) settings
and statistics. This directory is primarily used with ATM networking and ADSL cards.
• dev — Lists the various network devices configured on the system, complete with transmit and
receive statistics. This file will quickly tell you the number of bytes each interface has sent and
received, the number of packets inbound and outbound, the number of errors seen, the number of
packets dropped, and much more.
• dev_mcast — Displays the various Layer2 multicast groups each device is listening to.
• igmp — Lists the IP multicast addresses which this system joined.
• ip_fwchains — Reveals any current firewall chains.
• ip_fwnames — Lists all firewall chain names. By default, with no firewall chains configured,
the three original chains are given:
64 1
8 0
1 0
0 0
0 0
write-only 0
0 0
0 0
1 0
Chapter 4:The /proc Filesystem
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