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Re: [Qemu-devel] spapr guests warn "System page size 0x2000 is not enabl
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From: |
Thomas Huth |
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Subject: |
Re: [Qemu-devel] spapr guests warn "System page size 0x2000 is not enabled in page_size_mask (0x11000). Performance may be slow" on SPARC hosts |
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Date: |
Mon, 19 Jun 2017 12:32:48 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0 |
On 19.06.2017 11:39, Alexander Graf wrote:
> On 06/15/2017 03:33 PM, Peter Maydell wrote:
>> I've just noticed that on a SPARC host, some of the PPC guests
>> warn during make check:
>>
>> /ppc64/prom-env/pseries:
>> qemu-system-ppc64: System page size 0x2000 is not enabled in
>> page_size_mask (0x11000). Performance may be slow
>>
>> Is this really a performance problem on a TCG guest?
>> It makes the 'make check' output a bit noisy, but not
>> unbearably so.
>
> From what I can tell this really only affects DDW which should be page
> size agnostic when only using emulated devices. Maybe Alexey thought of
> using VFIO-pci devices in a TCG guest?
Maybe we could at least silence the warning by checking qtest_enabled()?
Thomas