linux-kernel - Re: is kernel slower at loading for some hardware ?

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Date:	Mon, 4 May 2015 09:50:35 +0200
From:	Frans Klaver <fransklaver@...il.com>
To:	linux cbon <linuxcbon@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: is kernel slower at loading for some hardware ?

On Mon, May 4, 2015 at 7:21 AM, linux cbon <linuxcbon@...il.com> wrote:
> Hi,
>
> during boot up, I am trying to find where the kernel takes more time
> to do actions (is slower ?).
> I looked at dmesg and found some places where it takes more time, but
> not sure if this is normal :
>
> [    0.070964] smpboot: CPU0: AMD Athlon(tm) 7750 Dual-Core Processor
> (fam: 10, model: 02, stepping: 03)
> [    0.175415] Performance Events: AMD PMU driver.
>
> [    0.248501] NET: Registered protocol family 1
> [    0.248515] pci 0000:00:01.0: MSI quirk detected; subordinate MSI disabled
> [    1.878384] pci 0000:01:05.0: Video device with shadowed ROM
>
> [    2.225414] ata3: SATA link down (SStatus 0 SControl 300)
> [    2.392196] ata1: softreset failed (device not ready)
> [    2.392199] ata1: applying PMP SRST workaround and retrying
> [    2.422234] usb 3-1: new low-speed USB device number 2 using ohci-pci
> [    2.559072] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
>
> [    2.695906] hid-generic 0003:04F3:0103.0002: input: USB HID v1.11
> Device [HID 04f3:0103] on usb-0000:00:12.0-1/input1
> [    2.882804] tsc: Refined TSC clocksource calibration: 2712.351 MHz
> [    3.059684] ata1: softreset failed (device not ready)
> [    3.059687] ata1: applying PMP SRST workaround and retrying
>
> [    3.236722]  sda: sda1 sda2
> [    3.236880] sd 0:0:0:0: [sda] Attached SCSI disk
> [    3.472247] input: ImPS/2 Logitech Wheel Mouse as
> /devices/platform/i8042/serio1/input/input2
> [    3.475012] md: Waiting for all devices to be available before autodetect
>
> [    3.526543] Freeing unused kernel memory: 796K (ffffffff816a3000 -
> ffffffff8176a000)
> [    3.887420] Switched to clocksource tsc
> [    4.953361] random: nonblocking pool is initialized
>
> Not sure if it is normal or not...maybe it's just normal behavior or
> cannot get any faster...

All hardware is different and therefore initialization time can be
different per component. Besides that, you're looking at something
that depends on how verbose the driver's logs are. It may well be that
the kernel is doing a lot of work, but just doesn't output anything
that clears the minimum log level.

Frans
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