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From: festevam@gmail.com (Fabio Estevam)
To: linux-arm-kernel@lists.infradead.org
Subject: [CFT] Always enable SMP mode on MP capable CPUs
Date: Fri, 19 May 2017 14:07:28 -0300	[thread overview]
Message-ID: <CAOMZO5Dc=i7UdQH=r5RRr_4GmyZZT+rh7BTNV4WbfqKvtVDfsw@mail.gmail.com> (raw)
In-Reply-To: <CAOMZO5Da2R2_t2nU+MdrJiSzvcBQKS4pwYS96r4UyfGc8DtWww@mail.gmail.com>

On Thu, May 18, 2017 at 3:09 PM, Fabio Estevam <festevam@gmail.com> wrote:

> I tested this patch on a mx6ul, which is CortexA7 UP using USB serial
> download mode.
>
> In this boot mode the ROM code does not set the SMP bit and I can
> notice a very slow boot progress with CONFIG_SMP=n with an original
> 4.12-rc1.
>
> With this patch applied it boots with the correct speed, so:

However the kernel still takes a long time to decompress when the
bootloader or ROM does not set the SMP bit.

After it decompress, then it boots quickly.

Should the SMP bit be set inside arch/arm/boot/compressed/head.S?

Thanks

  reply	other threads:[~2017-05-19 17:07 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-18 10:52 [CFT] Always enable SMP mode on MP capable CPUs Russell King - ARM Linux
2017-05-18 18:09 ` Fabio Estevam
2017-05-19 17:07   ` Fabio Estevam [this message]
2017-05-19 17:15     ` Russell King - ARM Linux
2017-05-24 15:38       ` Tony Lindgren
2017-05-24 15:38         ` Tony Lindgren
2017-05-25 14:48         ` Russell King - ARM Linux
2017-05-25 14:48           ` Russell King - ARM Linux
2017-05-25 15:11           ` Tony Lindgren
2017-05-25 15:11             ` Tony Lindgren
2017-05-25 18:05             ` Russell King - ARM Linux
2017-05-25 18:05               ` Russell King - ARM Linux
2017-05-25 22:13               ` Tony Lindgren
2017-05-25 22:13                 ` Tony Lindgren
2017-05-26 11:22                 ` afzal mohammed
2017-05-26 11:22                   ` afzal mohammed
2017-05-27 13:22                   ` Russell King - ARM Linux
2017-05-27 13:22                     ` Russell King - ARM Linux
2017-05-31 14:39                     ` Tony Lindgren
2017-05-31 14:39                       ` Tony Lindgren
2017-05-31 14:59                       ` Russell King - ARM Linux
2017-05-31 14:59                         ` Russell King - ARM Linux
2017-05-31 15:07                         ` Tony Lindgren
2017-05-31 15:07                           ` Tony Lindgren
2017-05-24 15:50 ` afzal mohammed
2017-05-24 15:50   ` afzal mohammed
2017-05-25 16:15 ` Florian Fainelli
2017-05-25 16:56   ` Russell King - ARM Linux
2017-05-25 17:10     ` Tony Lindgren
2017-05-25 17:10       ` Tony Lindgren
2017-05-25 17:24     ` Florian Fainelli
2017-05-26  9:44 ` Vladimir Murzin

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