From: jonas.aberg@stericsson.com (Jonas Aaberg)
To: linux-arm-kernel@lists.infradead.org
Subject: Why call calibrate_delay() in smp.c: secondary_start_kernel()
Date: Tue, 18 Jan 2011 09:43:46 +0100 [thread overview]
Message-ID: <4D3552C2.3020101@stericsson.com> (raw)
Hi,
calibrate_delay() calculates loops_per_jiffy. loops_per_jiffy is not per cpu.
Therefore I wonder why there is a calibrate_delay() call in smp.c:
secondary_start_kernel()?
If you don't set lpj= it looks like it just takes longer time to boot
and bring a secondary cpu online.
u8500 seems to do fine without the calibrate_delay() call.
Best regards,
Jonas Aaberg
next reply other threads:[~2011-01-18 8:43 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-18 8:43 Jonas Aaberg [this message]
2011-01-18 10:16 ` Why call calibrate_delay() in smp.c: secondary_start_kernel() Santosh Shilimkar
2011-01-18 11:31 ` Russell King - ARM Linux
2011-01-18 12:12 ` Santosh Shilimkar
2011-01-18 12:16 ` Russell King - ARM Linux
2011-01-18 12:25 ` Santosh Shilimkar
2011-01-18 15:17 ` Linus Walleij
2011-01-18 15:30 ` Santosh Shilimkar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4D3552C2.3020101@stericsson.com \
--to=jonas.aberg@stericsson.com \
--cc=linux-arm-kernel@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.