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Date: Sat, 09 Oct 2010 10:26:28 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-help] latency spike when starting opengl windows
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To: Peter Pastor <peter.pastor@domain.hid>
Cc: xenomai@xenomai.org

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Am 08.10.2010 03:44, Peter Pastor wrote:
> Hey there,
>=20
> I noticed a spike in the latency over around 600-800microseconds when
> starting an opengl window.
>=20
> I have the SMI workaround enabled and also included my device id in the=

>=20
> /usr/src/xenomai/ksrc/arch/x86/smi.c
>=20
> file
>=20
> lspci -vvv -nn shows a
>=20
> Intel Corporation 82801JIR (ICH10R) LPC Interface Controller [8086:3a16=
]
>=20
> so I added
>=20
> {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH10_1)},
>=20
> After recompiling the kernel I finally saw
>=20
> [    2.443949] Xenomai: SMI-enabled chipset found
>=20
> ( I did not see that line before )
> but unfortunately I also saw
>=20
> [    2.443957] Xenomai: SMI workaround failed!
>=20
> Well, the latency test still showed spikes of about 600-800microsends w=
hen
> for example starting or closing glxgears. I am using a nvidia FxQuadro =
FX
> 4800 and I am using the latest nvidia driver which I downloaded from th=
e
> nvidia homepage (256.53).

The nice nvdidia driver is known to cause latency peaks during DMA
memory allocation/mapping (wbinvd...). You will have to leave it in a
stable state (no X restarts, no 3D or CUDA setup/tear-down, not sure
about mode switches ATM) as long as the RT load is running.

Jan


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