From: Randy Dunlap <rdunlap@infradead.org>
To: "Toralf Förster" <toralf.foerster@gmx.de>,
"Linux Kernel" <linux-kernel@vger.kernel.org>
Subject: Re: why does "mem auto-init: clearing system memory may take some time..." takes about 14 sec under 5.4.17 but only few msec under 5.5.1?
Date: Sun, 29 Mar 2020 19:55:38 -0700 [thread overview]
Message-ID: <a8e02d42-a16a-c665-6a55-1c43818fa48c@infradead.org> (raw)
In-Reply-To: <c7a23250-6b23-2a9e-88c8-924c34fb9139@gmx.de>
On 2/1/20 9:52 AM, Toralf Förster wrote:
> I do wonder (and I'm surprised) about increased boot speed according to dmesg for thi9s hardend Gentoo Linux system:
> Linux mr-fox 5.5.1 #1 SMP Sat Feb 1 18:25:21 CET 2020 x86_64 Intel(R) Xeon(R) CPU E5-1650 v3 @ 3.50GHz GenuineIntel GNU/Linux
>
> Under 5.4.17 I do have usually 14 sec to wait:
>
> [ 0.497171] mem auto-init: stack:byref_all, heap alloc:on, heap free:on
> [ 0.497171] mem auto-init: clearing system memory may take some time...
> [ 0.501549] Calgary: detecting Calgary via BIOS EBDA area
> [ 0.501550] Calgary: Unable to locate Rio Grande table in EBDA - bailing!
> [ 14.083235] Memory: 131812972K/134101088K available (12291K kernel code, 1400K rwdata, 1912K rodata, 1272K init, 2040K bss, 2288116K reserved, 0K cma-reserved)
> [ 14.083342] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=12, Nodes=1
> [ 14.083350] Kernel/User page tables isolation: enabled
> [ 14.083403] rcu: Hierarchical RCU implementation.
> [ 14.083404] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
> [ 14.083414] NR_IRQS: 4352, nr_irqs: 928, preallocated irqs: 16
>
> but with 5.5.1 there's no wait?:
>
> [ 0.000000] mem auto-init: stack:byref_all, heap alloc:on, heap free:on
> [ 0.000000] mem auto-init: clearing system memory may take some time...
> [ 0.000000] Memory: 131812876K/134101088K available (12291K kernel code, 1412K rwdata, 1936K rodata, 1260K init, 2012K bss, 2288212K reserved, 0K cma-reserved)
> [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=12, Nodes=1
> [ 0.000000] Kernel/User page tables isolation: enabled
> [ 0.000000] rcu: Hierarchical RCU implementation.
> [ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
> [ 0.000000] NR_IRQS: 4352, nr_irqs: 928, preallocated irqs: 16
> [ 0.000000] random: get_random_bytes called from start_kernel+0x4a8/0x659 with crng_init=0
>
> Do I miss something? (The kernel config was derived via "make oldconfig").
Hi > Toralf,
Curious/odd.
Do you have the kernel .config files for 5.4.17 and 5.5.1?
Looks like it would have to be a config difference AFAICT.
--
~Randy
next prev parent reply other threads:[~2020-03-30 2:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-01 17:52 why does "mem auto-init: clearing system memory may take some time..." takes about 14 sec under 5.4.17 but only few msec under 5.5.1? Toralf Förster
2020-03-30 2:55 ` Randy Dunlap [this message]
2020-03-30 7:12 ` Toralf Förster
2020-03-30 9:12 ` Toralf Förster
2020-04-03 1:33 ` Randy Dunlap
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