My CNC computer was purchased several years ago from Sherline with CNC
installed.
I have two disk drives. One has linuxcnc-2.7.14-wheezy.iso and the
other has linuxcnc-stretch-uspace-amd64.iso.
On both OS's, I see 'unexpected latency warning messages', infrequent on
'wheezy' and 99% of the time at linuxcnc startup on 'stretch'. The
latency test shows jitter around 40us for 'wheezy' and 100us for 'stretch'.
The cpu is Intel Atom CPU D2500 @ 1.86GHz
It has 1G memory.
Lots of free disk space.
lspci shows:
00:02.0 VGA compatible controller: Intel Corporation Atom Processor
D2xxx/N2xxx Integrated Graphics Controller (rev 0b)
and lspci -v shows:
00:02.0 VGA compatible controller: Intel Corporation Atom Processor
D2xxx/N2xxx Integrated Graphics Controller (rev 0b) (prog-if 00 [VGA
controller])
Subsystem: Intel Corporation Atom Processor D2xxx/N2xxx
Integrated Graphics Controller
Flags: bus master, fast devsel, latency 0, IRQ 29
Memory at 40100000 (32-bit, non-prefetchable) [size=1M]
I/O ports at 20d0 [size=8]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: [d0] Power Management version 2
Capabilities: [b0] Vendor Specific Information: Len=07 <?>
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Kernel driver in use: gma500
Kernel modules: gma500_gfx
Looks like the on-board video adapter shares main memory with the CPU.
Linuxcnc system requirements says this is a no=no.
Question: Will installing a PCI video card likely to reduce the latency
and eliminate the warnings?
Tom Dean
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