Dmesg command

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-dmesg (for "diagnostic message") is a command on Unix-like operating systems that prints the message buffer of the kernel. This buffer contains a variety of important messages from those printed during boot to those used for debugging software. This information may also be stored to disk via a logging daemon, such as syslog. 
-dmesg is often piped to tail for an easier overview of recent events: 
- 
- dmesg | tail 
- 
-Example output on a Linksys WRT54G router (with CPU overclocked) running DD-WRT v24rc4: 
- 
-<pre>root@DD-WRT:~# dmesg 
-CPU revision is: 00029008 
-Linux version 2.4.35 (root@dd-wrt) (gcc version 3.4.4 (OpenWrt-2.0)) #2530 Wed Oct 10 02:19:55 CEST 2007 
-Setting the PFC to its default value 
-Determined physical RAM map: 
- memory: 01000000 @ 00000000 (usable) 
-On node 0 totalpages: 4096 
-zone(0): 4096 pages. 
-zone(1): 0 pages. 
-zone(2): 0 pages. 
-Kernel command line: root=/dev/mtdblock2 rootfstype=squashfs,jffs2 noinitrd console=ttyS0,115200 
-CPU: BCM5352 rev 0 at 250 MHz 
-Using 125.000 MHz high precision timer. 
-Calibrating delay loop... 249.03 BogoMIPS 
-Dentry cache hash table entries: 2048 (order: 2, 16384 bytes) 
-Inode cache hash table entries: 1024 (order: 1, 8192 bytes) 
-Mount cache hash table entries: 512 (order: 0, 4096 bytes) 
-Buffer cache hash table entries: 1024 (order: 0, 4096 bytes) 
-Page-cache hash table entries: 4096 (order: 2, 16384 bytes) 
-Checking for 'wait' instruction... unavailable. 
-POSIX conformance testing by UNIFIX 
-PCI: no core 
-PCI: Fixing up bus 0 
-Initializing RT netlink socket 
-Starting kswapd 
-devfs: v1.12c (20020818) Richard Gooch (rgooch@atnf.csiro.au) 
-devfs: boot_options: 0x1 
-squashfs: version 3.0 (2006/03/15) Phillip Lougher 
-pty: 256 Unix98 ptys configured 
-Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ SERIAL_PCI enabled 
-ttyS00 at 0xb8000300 (irq = 3) is a 16550A 
-ttyS01 at 0xb8000400 (irq = 3) is a 16550A 
-Software Watchdog Timer: 0.05, timer margin: 60 sec 
-PCI: Setting latency timer of device 00:01.0 to 64 
-Universal TUN/TAP device driver 1.5 (C)1999-2002 Maxim Krasnyansky 
-Physically mapped flash: Found an alias at 0x400000 for the chip at 0x0 
-Physically mapped flash: Found an alias at 0x800000 for the chip at 0x0 
-Physically mapped flash: Found an alias at 0xc00000 for the chip at 0x0 
-Physically mapped flash: Found an alias at 0x1000000 for the chip at 0x0 
-Physically mapped flash: Found an alias at 0x1400000 for the chip at 0x0 
-Physically mapped flash: Found an alias at 0x1800000 for the chip at 0x0 
-Physically mapped flash: Found an alias at 0x1c00000 for the chip at 0x0 
- Amd/Fujitsu Extended Query Table v3.3 at 0x0040 
-number of CFI chips: 1 
-cfi_cmdset_0002: Disabling fast programming due to code brokenness. 
-Flash device: 0x400000 at 0x1c000000 
-bootloader size: 262144 
-Physically mapped flash: Filesystem type: squashfs, size=0x2d1f7c 
-Creating 5 MTD partitions on "Physically mapped flash": 
-0x00000000-0x00040000 : "cfe" 
-0x00040000-0x003f0000 : "linux" 
-0x000c98c8-0x003a0000 : "rootfs" 
-mtd: partition "rootfs" doesn't start on an erase block boundary -- force read-only 
-0x003f0000-0x00400000 : "nvram" 
-0x003a0000-0x003f0000 : "ddwrt" 
-Initializing Cryptographic API 
-IP Protocols: ICMP, UDP, TCP, IGMP 
-IP: routing cache hash table of 512 buckets, 4Kbytes 
-TCP: Hash tables configured (established 1024 bind 2048) 
-ip_conntrack version 2.1 (512 buckets, 4096 max) - 336 bytes per conntrack 
-ip_tables: (C) 2000-2002 Netfilter core team 
-ipt_random match loaded 
-netfilter PSD loaded - (c) astaro AG 
-ipt_osf: Startng OS fingerprint matching module. 
-ipt_IPV4OPTSSTRIP loaded 
-NET4: Unix domain sockets 1.0/SMP for Linux NET4.0. 
-802.1Q VLAN Support v1.8 Ben Greear <greearb@candelatech.com> 
-All bugs added by David S. Miller <davem@redhat.com> 
-VFS: Mounted root (squashfs filesystem) readonly. 
-Mounted devfs on /dev 
-diag boardtype: 00000467 
-PCI: Setting latency timer of device 00:05.0 to 64 
-eth1: Broadcom BCM4320 802.11 Wireless Controller 4.80.56.0 
-vlan0: add 01:00:5e:00:00:01 mcast address to master interface 
-vlan0: dev_set_promiscuity(master, 1) 
-device eth0 entered promiscuous mode 
-device vlan0 entered promiscuous mode 
-device eth1 entered promiscuous mode 
-vlan1: Setting MAC address to 00 1c 10 5a b9 0d. 
-vlan1: add 01:00:5e:00:00:01 mcast address to master interface 
-vlan1: dev_set_promiscuity(master, 1) 
-device vlan1 entered promiscuous mode 
-vlan1: dev_set_allmulti(master, 1) 
-device br0 entered promiscuous mode 
-vlan1: dev_set_allmulti(master, 1) 
-vlan1: add 01:00:5e:7f:ff:fa mcast address to master interface 
-vlan0: dev_set_promiscuity(master, -1) 
-device vlan0 left promiscuous mode 
-device eth1 left promiscuous mode 
-vlan0: dev_set_promiscuity(master, 1) 
-device vlan0 entered promiscuous mode 
-device eth1 entered promiscuous mode 
-device br0 left promiscuous mode</pre> 
- 
-Source: http://en.wikipedia.org/wiki/Dmesg 
- 
-[[Category:English documentation]] 
-[[Category:commandline command reference]] 

Revision as of 06:58, 5 June 2009