* [2.6 patch] let LOG_BUF_SHIFT default to 17
@ 2008-01-28 22:12 Adrian Bunk
2008-01-28 22:37 ` Randy Dunlap
` (2 more replies)
0 siblings, 3 replies; 7+ messages in thread
From: Adrian Bunk @ 2008-01-28 22:12 UTC (permalink / raw)
To: linux-kernel
16 kB is often no longer enough for a normal boot of an UP system.
And even less when people e.g. use suspend.
17 seems to be a more reasonable default for current kernels on current
hardware (it's just the default, anyone who is memory limited can
still lower it).
Signed-off-by: Adrian Bunk <bunk@kernel.org>
---
f02213e3c1cb90ec1c66227f037110d489f30bfd
diff --git a/init/Kconfig b/init/Kconfig
index 0eda68f..81a1255 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -272,17 +272,14 @@ config IKCONFIG_PROC
config LOG_BUF_SHIFT
int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
range 12 21
- default 17 if S390 || LOCKDEP
- default 16 if X86_NUMAQ || IA64
- default 15 if SMP
- default 14
+ default 17
help
Select kernel log buffer size as a power of 2.
- Defaults and Examples:
- 17 => 128 KB for S/390
- 16 => 64 KB for x86 NUMAQ or IA-64
- 15 => 32 KB for SMP
- 14 => 16 KB for uniprocessor
+ Examples:
+ 17 => 128 KB
+ 16 => 64 KB
+ 15 => 32 KB
+ 14 => 16 KB
13 => 8 KB
12 => 4 KB
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [2.6 patch] let LOG_BUF_SHIFT default to 17
2008-01-28 22:12 [2.6 patch] let LOG_BUF_SHIFT default to 17 Adrian Bunk
@ 2008-01-28 22:37 ` Randy Dunlap
2008-01-29 6:35 ` Andi Kleen
2008-02-01 16:20 ` Ingo Molnar
2 siblings, 0 replies; 7+ messages in thread
From: Randy Dunlap @ 2008-01-28 22:37 UTC (permalink / raw)
To: Adrian Bunk; +Cc: linux-kernel
On Tue, 29 Jan 2008 00:12:23 +0200 Adrian Bunk wrote:
> 16 kB is often no longer enough for a normal boot of an UP system.
s/16/64/ then agreed.
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
> And even less when people e.g. use suspend.
>
> 17 seems to be a more reasonable default for current kernels on current
> hardware (it's just the default, anyone who is memory limited can
> still lower it).
>
> Signed-off-by: Adrian Bunk <bunk@kernel.org>
>
> ---
> f02213e3c1cb90ec1c66227f037110d489f30bfd
> diff --git a/init/Kconfig b/init/Kconfig
> index 0eda68f..81a1255 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -272,17 +272,14 @@ config IKCONFIG_PROC
> config LOG_BUF_SHIFT
> int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
> range 12 21
> - default 17 if S390 || LOCKDEP
> - default 16 if X86_NUMAQ || IA64
> - default 15 if SMP
> - default 14
> + default 17
> help
> Select kernel log buffer size as a power of 2.
> - Defaults and Examples:
> - 17 => 128 KB for S/390
> - 16 => 64 KB for x86 NUMAQ or IA-64
> - 15 => 32 KB for SMP
> - 14 => 16 KB for uniprocessor
> + Examples:
> + 17 => 128 KB
> + 16 => 64 KB
> + 15 => 32 KB
> + 14 => 16 KB
> 13 => 8 KB
> 12 => 4 KB
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
>
---
~Randy
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [2.6 patch] let LOG_BUF_SHIFT default to 17
2008-01-28 22:12 [2.6 patch] let LOG_BUF_SHIFT default to 17 Adrian Bunk
2008-01-28 22:37 ` Randy Dunlap
@ 2008-01-29 6:35 ` Andi Kleen
2008-01-29 7:36 ` Adrian Bunk
2008-02-01 16:20 ` Ingo Molnar
2 siblings, 1 reply; 7+ messages in thread
From: Andi Kleen @ 2008-01-29 6:35 UTC (permalink / raw)
To: Adrian Bunk; +Cc: linux-kernel
Adrian Bunk <bunk@kernel.org> writes:
> 16 kB is often no longer enough for a normal boot of an UP system.
Better would be to just disable by default/remove noisy messages
to make the kernel boot output shorter.
I think we got a lot of IMHO useless messages in there.
-Andi
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [2.6 patch] let LOG_BUF_SHIFT default to 17
2008-01-29 6:35 ` Andi Kleen
@ 2008-01-29 7:36 ` Adrian Bunk
0 siblings, 0 replies; 7+ messages in thread
From: Adrian Bunk @ 2008-01-29 7:36 UTC (permalink / raw)
To: Andi Kleen; +Cc: linux-kernel
On Tue, Jan 29, 2008 at 07:35:00AM +0100, Andi Kleen wrote:
> Adrian Bunk <bunk@kernel.org> writes:
>
> > 16 kB is often no longer enough for a normal boot of an UP system.
>
> Better would be to just disable by default/remove noisy messages
> to make the kernel boot output shorter.
>
> I think we got a lot of IMHO useless messages in there.
Nearly 25% of the messages in my dmesg come from ACPI.
Plus many other messages that cover these generic resources stuff (e.g.
BIOS map or ioport/iomem reservations).
All of these tend to be of great help when debugging driver regressions,
since diff'ing the dmesg's often is enough for determining whether it's
a driver problem or a PCI/ACPI/whatever problem.
> -Andi
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [2.6 patch] let LOG_BUF_SHIFT default to 17
2008-01-28 22:12 [2.6 patch] let LOG_BUF_SHIFT default to 17 Adrian Bunk
2008-01-28 22:37 ` Randy Dunlap
2008-01-29 6:35 ` Andi Kleen
@ 2008-02-01 16:20 ` Ingo Molnar
2008-02-11 22:42 ` Adrian Bunk
2 siblings, 1 reply; 7+ messages in thread
From: Ingo Molnar @ 2008-02-01 16:20 UTC (permalink / raw)
To: Adrian Bunk; +Cc: linux-kernel
* Adrian Bunk <bunk@kernel.org> wrote:
> 16 kB is often no longer enough for a normal boot of an UP system.
>
> And even less when people e.g. use suspend.
>
> 17 seems to be a more reasonable default for current kernels on
> current hardware (it's just the default, anyone who is memory limited
> can still lower it).
agreed - but i think the default should be even higher. Many reported
dmesg's are truncated at the really interesting bits so it's a real
problem in practice.
Ingo
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [2.6 patch] let LOG_BUF_SHIFT default to 17
2008-02-01 16:20 ` Ingo Molnar
@ 2008-02-11 22:42 ` Adrian Bunk
0 siblings, 0 replies; 7+ messages in thread
From: Adrian Bunk @ 2008-02-11 22:42 UTC (permalink / raw)
To: Ingo Molnar; +Cc: linux-kernel
On Fri, Feb 01, 2008 at 05:20:03PM +0100, Ingo Molnar wrote:
>
> * Adrian Bunk <bunk@kernel.org> wrote:
>
> > 16 kB is often no longer enough for a normal boot of an UP system.
> >
> > And even less when people e.g. use suspend.
> >
> > 17 seems to be a more reasonable default for current kernels on
> > current hardware (it's just the default, anyone who is memory limited
> > can still lower it).
>
> agreed - but i think the default should be even higher. Many reported
> dmesg's are truncated at the really interesting bits so it's a real
> problem in practice.
17 is 128 kB.
Do we really have that many truncated dmesg's with LOG_BUF_SHIFT=17?
> Ingo
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
^ permalink raw reply [flat|nested] 7+ messages in thread
* [2.6 patch] let LOG_BUF_SHIFT default to 17
@ 2008-02-17 8:17 Adrian Bunk
0 siblings, 0 replies; 7+ messages in thread
From: Adrian Bunk @ 2008-02-17 8:17 UTC (permalink / raw)
To: linux-kernel; +Cc: Randy Dunlap
16 kB is often no longer enough for a normal boot of an UP system.
And even less when people e.g. use suspend.
17 seems to be a more reasonable default for current kernels on current
hardware (it's just the default, anyone who is memory limited can
still lower it).
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
---
This patch has been sent on:
- 29 Jan 2008
f02213e3c1cb90ec1c66227f037110d489f30bfd
diff --git a/init/Kconfig b/init/Kconfig
index 0eda68f..81a1255 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -272,17 +272,14 @@ config IKCONFIG_PROC
config LOG_BUF_SHIFT
int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
range 12 21
- default 17 if S390 || LOCKDEP
- default 16 if X86_NUMAQ || IA64
- default 15 if SMP
- default 14
+ default 17
help
Select kernel log buffer size as a power of 2.
- Defaults and Examples:
- 17 => 128 KB for S/390
- 16 => 64 KB for x86 NUMAQ or IA-64
- 15 => 32 KB for SMP
- 14 => 16 KB for uniprocessor
+ Examples:
+ 17 => 128 KB
+ 16 => 64 KB
+ 15 => 32 KB
+ 14 => 16 KB
13 => 8 KB
12 => 4 KB
^ permalink raw reply related [flat|nested] 7+ messages in thread
end of thread, other threads:[~2008-02-17 8:18 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2008-01-28 22:12 [2.6 patch] let LOG_BUF_SHIFT default to 17 Adrian Bunk
2008-01-28 22:37 ` Randy Dunlap
2008-01-29 6:35 ` Andi Kleen
2008-01-29 7:36 ` Adrian Bunk
2008-02-01 16:20 ` Ingo Molnar
2008-02-11 22:42 ` Adrian Bunk
2008-02-17 8:17 Adrian Bunk
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