From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC] Make SMP secondary CPU up more resilient to failure.
Date: Sat, 18 Dec 2010 20:04:43 +0000 [thread overview]
Message-ID: <20101218200443.GM9937@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <AANLkTimG8yuCMOJPz9-ANi_2hf7E2HPYPy9sWaxVPXmE@mail.gmail.com>
On Sat, Dec 18, 2010 at 06:10:49AM -0600, Andrei Warkentin wrote:
> Definitely. This would be exactly the right place to place any holding
> logic...
FYI, I've managed to get some timing figures out of my Versatile
Express platform. It takes about 100us for a CPU to come online via
hotplug, and a further 222ms to run the calibration before marking the
CPU online.
That leaves a margin of about 750ms before the timeout in the generic code
fires.
CPU requesting hotplug, times in ns:
SMP: Start: 0
SMP: Booting: 750
SMP: Cross call: 3500
SMP: Pen released: 41167
SMP: Unlock: 42417
SMP: Boot returned: 43250
CPU being brought online, referenced to "SMP: Start" above, times in ns.
SMP: Sec: restart: 3834
SMP: Sec: up: 5334
SMP: Sec: enter: 30667
SMP: Sec: pen write: 38917
SMP: Sec: pen done: 41417
SMP: Sec: exit: 42750
SMP: Sec: calibrate: 91834
SMP: Sec: online: 222054375
next prev parent reply other threads:[~2010-12-18 20:04 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-15 23:45 [RFC] Make SMP secondary CPU up more resilient to failure Andrei Warkentin
2010-12-16 11:34 ` Russell King - ARM Linux
2010-12-16 23:09 ` Andrei Warkentin
2010-12-16 23:28 ` Russell King - ARM Linux
2010-12-17 20:52 ` Andrei Warkentin
2010-12-17 23:14 ` Russell King - ARM Linux
2010-12-17 23:45 ` Andrei Warkentin
2010-12-18 0:08 ` Russell King - ARM Linux
2010-12-18 0:36 ` Russell King - ARM Linux
2010-12-18 7:17 ` Andrei Warkentin
2010-12-18 12:01 ` Russell King - ARM Linux
2010-12-18 12:10 ` Andrei Warkentin
2010-12-18 20:04 ` Russell King - ARM Linux [this message]
2010-12-21 21:53 ` Andrei Warkentin
2010-12-24 17:38 ` Russell King - ARM Linux
2011-01-13 10:19 ` Andrei Warkentin
2011-01-13 11:14 ` Russell King - ARM Linux
2011-01-13 22:03 ` Andrei Warkentin
2010-12-17 0:11 ` murali at embeddedwireless.com
2010-12-18 9:58 ` Russell King - ARM Linux
2010-12-18 11:54 ` Andrei Warkentin
2010-12-18 12:19 ` Russell King - ARM Linux
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