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From: Stefan Weil <sw@weilnetz.de>
References: <20170911022839.23231-1-f4bug@amsat.org>
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Date: Tue, 12 Sep 2017 11:20:12 +0200
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Subject: Re: [Qemu-devel] [PATCH] tcg/tci: do not use ldst label (never
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To: Thomas Huth <thuth@redhat.com>
Cc: Peter Maydell <peter.maydell@linaro.org>, Richard Henderson <richard.henderson@linaro.org>, QEMU Developers <qemu-devel@nongnu.org>, =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= <f4bug@amsat.org>, Paolo Bonzini <pbonzini@redhat.com>, Richard Henderson <rth@twiddle.net>

Am 12.09.2017 um 10:52 schrieb Stefan Weil:
> Am 11.09.2017 um 20:24 schrieb Peter Maydell:
>> I've also turned on a tci compile check on my pre-merge tests.
>> (It doesn't pass "make check" for me, though...) thanks -- PMM
> 
> "make check-qtest-ppc64" fails for me, too.
> 
> Thomas, this seems to be again the well known timing problem
> in tests/prom-env-test.c. The time for the test had been
> changedfrom 30 s to 10 s to 120 s in the past.

... changed from 10 s to 30 s to 120 s ...

> For TCI, even that latest value is not sufficient when
> testing with pseries. Of course that also depends on other
> parameters (speed of test machine, compiler flags).
> 
> In my test pseries took nearly 5 minutes, so the test passes
> when the loop upper limit is increased to 30000.

Timing data for prom-env-test with TCI on another test machine:

mac99:   78 s
g3beige: 74 s
pseries: 477 s

> 
> Is there a better way to handle this test? Why does pseries
> still need much more time than the other machines
> (not only with TCI)?
> 
> Regards,
> Stefan