From: Richard Henderson <rth@twiddle.net>
To: Michael Cree <cree@waikato.ac.nz>
Cc: linux-kernel@vger.kernel.org, ink@jurassic.park.msu.ru,
mattst88@gmail.com, linux-alpha@vger.kernel.org
Subject: Re: [RFC PATCH 00/10] Alpha support for QEMU
Date: Thu, 18 Jul 2013 15:04:25 -0700 [thread overview]
Message-ID: <51E86669.5040608@twiddle.net> (raw)
In-Reply-To: <20130718212815.GA32459@stolen.phys.waikato.ac.nz>
On 07/18/2013 02:28 PM, Michael Cree wrote:
> The kernel without the patch set has the "Using epoch 2000" line and
> the kernel with the patch set is missing the "Using epoch 2000" line.
Ah hah. You appear to be missing CONFIG_RTC_DRV_ALPHA in the new kernel, so
you have no support for the RTC at all. Please re-try.
> On the kernel without the patch set the dummy-RTC timer interrupt received
> 30876 interrupts in a 30s period which is within measurement uncertainty of
> the expected 30*1024 = 30720 interrupts.
>
> On the kernel with the patch set the dummy-RTC timer interrupt received 14419
> interrupts on CPU-1, 13935 interrupts on CPU-2 and 2619 interrupts on CPU-3
> over a 30s period.
Grr. Naturally, the old kernel obfuscates which timers are being delivered
where. So a direct comparison doesn't appear possible. But those separated
numbers seem uncomfortably low.
I've just pushed a new branch to
git://github.com/rth7680/linux.git axp-qemu-7
Please try that with CONFIG_ALPHA_WTINT disabled. I'd like to eliminate that
as a source of uncertainty for your system.
r~
next prev parent reply other threads:[~2013-07-18 22:04 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-16 17:34 Richard Henderson
2013-07-16 17:34 ` [RFC PATCH 01/10] alpha: Don't if-out dp264_device_interrupt Richard Henderson
2013-07-16 17:34 ` [RFC PATCH 02/10] alpha: Notice if we're being run under QEMU Richard Henderson
2013-07-16 17:34 ` [RFC PATCH 03/10] alpha: Force the user-visible HZ to a constant 1024 Richard Henderson
2013-07-16 17:34 ` [RFC PATCH 04/10] alpha: Allow HZ to be configured Richard Henderson
2013-07-16 17:34 ` [RFC PATCH 05/10] alpha: Primitive support for CPU power down Richard Henderson
2013-07-17 5:17 ` Matt Turner
2013-07-17 13:16 ` Richard Henderson
2013-07-16 17:34 ` [RFC PATCH 06/10] alpha: Reorganize rtc handling Richard Henderson
2013-07-16 17:34 ` [RFC PATCH 07/10] alpha: Add an rtc driver for the qemu wallclock PALcall Richard Henderson
2013-07-16 17:34 ` [RFC PATCH 08/10] alpha: Always enable the rpcc clocksource for single processor Richard Henderson
2013-07-16 17:34 ` [RFC PATCH 09/10] alpha: Switch to GENERIC_CLOCKEVENTS Richard Henderson
2013-07-16 17:34 ` [RFC PATCH 10/10] alpha: Use qemu+cserve provided high-res clock and alarm Richard Henderson
2013-07-18 1:14 ` [RFC PATCH 00/10] Alpha support for QEMU Michael Cree
2013-07-18 13:38 ` Richard Henderson
2013-07-18 21:28 ` Michael Cree
2013-07-18 22:04 ` Richard Henderson [this message]
2013-07-19 10:03 ` Michael Cree
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