Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 42)

42 Chapter 2. The /proc File System

nowerr 0 0 1 rw

number 0 0 3 rw

pio_mode write-only 0 255 w

slow 0 0 1 rw

unmaskirq 0 0 1 rw

using_dma 1 0 1 rw

2.3.5. /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 individual conﬁguration of each IRQ. 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/filesystems/proc.txt ﬁle.

2.3.6. /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 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 — If ipchains are in use, this virtual ﬁle reveals any current rule.

• ip_fwnames — If ipchains are in use, this virtual ﬁle lists all ﬁrewall chain names.

• ip_masquerade — Provides a table of masquerading information.

• ip_mr_cache — List of the multicast routing cache.

• ip_mr_vif — List of multicast virtual interfaces.

• netstat — Contains a broad yet detailed collection of networking statistics, including TCP time-

outs, SYN cookies sent and received, and much more.

• psched — List of global packet scheduler parameters.

• raw — List of raw device statistics.

• route — Displays the kernel’s routing table.

• rt_cache — Contains the current routing cache.

• snmp — List of Simple Network Management Protocol (SNMP) data for various networking pro-

tocols in use.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 281 282

Nessun commento

Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 42