Bug 166651

Summary:	sys-apps/util-linux-2.12r-r5: dmesg does't show all info from boot since kernel 2.6.19
Product:	Gentoo Linux	Reporter:	Toralf Förster <toralf>
Component:	Current packages	Assignee:	Gentoo Kernel Bug Wranglers and Kernel Maintainers <kernel>
Status:	RESOLVED INVALID
Severity:	minor	CC:	vapier
Priority:	High
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Toralf Förster gentoo-dev

2007-02-13 12:34:30 UTC

The problem can be shown by this:

tfoerste@n22 ~ $ ls -l dmesg-2.6.1*; head -n 3 dmesg-2.6.1*
-rw-r--r-- 1 tfoerste users 14711 Jan  2 10:55 dmesg-2.6.18-gentoo-r6
-rw-r--r-- 1 tfoerste users 15433 Feb 12 14:44 dmesg-2.6.19-gentoo-r5
==> dmesg-2.6.18-gentoo-r6 <==
Linux version 2.6.18-gentoo-r6 (root@n22) (gcc version 3.4.6 (Gentoo 3.4.6-r1, ssp-3.4.5-1.0, pie-8.7.9)) #1 Wed Dec 27 15:14:07 CET 2006
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009f000 (usable)

==> dmesg-2.6.19-gentoo-r5 <==
S-e820: 000000003ff67000 - 000000003ff79000 (ACPI NVS)
 BIOS-e820: 000000003ff80000 - 0000000040000000 (reserved)
 BIOS-e820: 00000000ff800000 - 0000000100000000 (reserved)

ANd using the argument "-s" for dmesg doesn't help :-(


Reproducible: Always

Comment 1 SpanKY gentoo-dev

2007-02-13 12:53:25 UTC

dmesg is a simple userspace utility that asks the kernel for its log

Comment 2 SpanKY gentoo-dev

2007-02-13 12:53:55 UTC

however, that still doesnt make this a valid bug ... your newer kernel fills up the buffer faster so the kernel starts to overwrite old messages

Comment 3 Toralf Förster gentoo-dev

2007-02-13 14:11:31 UTC

Ok, is there any chance for an enhancement request to increase the buffer size ?

Comment 4 SpanKY gentoo-dev

2007-02-13 15:25:59 UTC

no because it's already an option; increase it in your kernel config