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From: bahadir@l4dev.org (Bahadir Balban)
To: linux-arm-kernel@lists.infradead.org
Subject: Kernel Start-up Time
Date: Tue, 19 Jan 2010 13:04:04 +0200	[thread overview]
Message-ID: <4B5591A4.2050807@l4dev.org> (raw)
In-Reply-To: <201001181010.01975.caglarakyuz@gmail.com>

Caglar Akyuz wrote:
> Hello,
> 
> While measuring Linux start-up time, I see that printing version string in 
> "start_kernel" takes ~1.3 seconds. I guess this is the time between from 
> "bootloader jumping to uImage" and "printing version string in generic 
> start_kernel code".

> Thanks,
> Caglar
> 
> _____________________________________________________________________ 
>                                                                                                                                                                   
> [    4.700896] Starting kernel ...                                                                                                                                                  
> [    4.702971]                                                                                                                                                                      
> [    5.966039] [    0.000000] Linux version 2.6.30-davinci1-06079-g4e73fae-

Hi Caglar,

This sounds like the kernel decompression is taking time. Have you tried
booting an uncompressed kernel? See if you can print on physical uart
address from files under arch/arm/boot/compressed

Thanks,

-- 
Bahadir

  parent reply	other threads:[~2010-01-19 11:04 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-01-18  8:10 Kernel Start-up Time Caglar Akyuz
2010-01-18  8:39 ` Tonyliu
2010-01-18  8:54   ` Caglar Akyuz
2010-01-18 15:39     ` Steve Chen
2010-01-18 19:39       ` Dirk Behme
2010-01-19  8:40         ` Caglar Akyuz
2010-01-19  8:36       ` Caglar Akyuz
2010-01-19  9:02         ` Russell King - ARM Linux
2010-01-19 14:31           ` Caglar Akyuz
2010-01-19 11:04 ` Bahadir Balban [this message]
2010-01-19 14:40   ` Caglar Akyuz
2010-01-19 11:04 ` Johannes Stezenbach
2010-01-19 14:35   ` Caglar Akyuz

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