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From: Alex =?utf-8?Q?Benn=C3=A9e?= <alex.bennee@linaro.org>
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Date: Wed, 24 Jun 2015 17:39:43 +0100
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Subject: Re: [Qemu-devel] TCG baremetal tests repo
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To: Alexander Spyridakis <a.spyridakis@virtualopensystems.com>
Cc: mttcg@listserver.greensocs.com, Alvise Rigo <a.rigo@virtualopensystems.com>, Mark Burton <mark.burton@greensocs.com>, QEMU Developers <qemu-devel@nongnu.org>, KONRAD =?utf-8?B?RnLDqWTDqXJpYw==?= <fred.konrad@greensocs.com>


Alexander Spyridakis <a.spyridakis@virtualopensystems.com> writes:

> Hello all,
>
> You can find the latest tcg atomic test payload in the following repo:
>> git clone https://git.virtualopensystems.com/dev/tcg_baremetal_tests.git
>
> You also need an arm baremetal cross-compiler like arm-none-gnueabi- (arm)
> and the usual aarch64-linux-gnu- (arm64). Due to a PSCI bug in the current
> multithreading tcg repo, the atomic test was modified to work also on the
> vexpress machine model.

I sent a patch to fix the PSCI hang case to wake up the sleeping CPU. I
couldn't figure out how the vexpress code was waking it's CPUs. Do they
just start powered on?

>
> To run it:
>> make vexpress (or virt/virt64 for other targets)
>> ../mttcg/arm-softmmu/qemu-system-arm -nographic -M vexpress-a15 -kernel
> build-vexpress/image-vexpress.axf -smp 4
>
> On my machine it takes around 30 seconds for one run of the test and the
> results vary from as low as 5 to 30 errors per vCPU per 10 million
> iterations (no errors with KVM). It is also very interesting to note, that
> the current test finishes faster on upstream qemu than multithreaded qemu.
>
> Best regards.

-- 
Alex Bennée