[gentoo-user] increase the dmesg buffer

[gentoo-user] increase the dmesg buffer

[Philipp Riegger]

Hi!

I get lots and lots of messages in dmesg which results in me only  
seeing stuff from hard disk drivers and some grsec java messages in  
dmesg after rebooting. Is there a way to increase the buffer for  
this, so that i see twice as many messages, for example?

Thanks,
	Philipp
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Re: [gentoo-user] increase the dmesg buffer

[David Relson]

On Sun, 20 May 2007 15:54:52 +0300
Philipp Riegger wrote:

> Hi!
> 
> I get lots and lots of messages in dmesg which results in me only  
> seeing stuff from hard disk drivers and some grsec java messages in  
> dmesg after rebooting. Is there a way to increase the buffer for  
> this, so that i see twice as many messages, for example?
> 
> Thanks,
> 	Philipp


Since the dmesg buffer exists in kernel space, a kernel build is
required to change its size.  If recollection serves, the setting is
named CONFIG_LOG_BUF_SHIFT and the value is a power of 2.  For example

CONFIG_LOG_BUF_SHIFT=18

sets the buffer size to 262144 bytes.

HTH,

David

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Re: [gentoo-user] increase the dmesg buffer

[Dan Farrell]

On Sun, 20 May 2007 15:54:52 +0300
Philipp Riegger <lists@anderedomain.de> wrote:

> Hi!
> 
> I get lots and lots of messages in dmesg which results in me only  
> seeing stuff from hard disk drivers and some grsec java messages in  
> dmesg after rebooting. Is there a way to increase the buffer for  
> this, so that i see twice as many messages, for example?
> 
> Thanks,
> 	Philipp

You can use syslog if you like to log your dmesg output, so that you
can see it at any time.  
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Re: [gentoo-user] increase the dmesg buffer

[Philipp Riegger]

On 20.05.2007, at 17:58, David Relson wrote:
> Since the dmesg buffer exists in kernel space, a kernel build is
> required to change its size.  If recollection serves, the setting is
> named CONFIG_LOG_BUF_SHIFT and the value is a power of 2.  For example
>
> CONFIG_LOG_BUF_SHIFT=18
>
> sets the buffer size to 262144 bytes.

Thanks, that's exactly what i wanted. Now i can see all i want to see.


On 20.05.2007, at 18:59, Dan Farrell wrote:

> You can use syslog if you like to log your dmesg output, so that you
> can see it at any time.

I actually did that, i just remembered after posting. But at the time  
when it is logged, the buffer is already more then full, so it did  
never log the first messages.


Thanks,
	Philipp
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