Question regarding FAQ - Some Latency Solutions: isol
22 Jun 2020 10:29 #172320
by seuchato
Question regarding FAQ - Some Latency Solutions: isol was created by seuchato
I got a question regarding this section in
FAQ - Some Latency Solutions
:
Maybe I got it all wrong, but shouldn't that read "all bar the >lowest< number processor core are isolated" if for a 4 core cpu isocpus is set at "isolcpus=1,2,3"?
greez chris
Instead of running a CPU Hog, a far more elegant solution can be to use isolcpus
wiki.linuxcnc.org/cgi-bin/wiki.pl?The_Is..._Parameter_And_GRUB2
Here by use of a kernel parameter at boot time, all bar the >highest< number processor core are isolated from use and you are back to a single processor dominated by the real time processes again.
Maybe I got it all wrong, but shouldn't that read "all bar the >lowest< number processor core are isolated" if for a 4 core cpu isocpus is set at "isolcpus=1,2,3"?
greez chris
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22 Jun 2020 10:35 #172321
by tommylight
Replied by tommylight on topic Question regarding FAQ - Some Latency Solutions: isol
Lowest cpu is 0, that remains in use, the others are isolated and not used.
That has the downside of bringing the PC to a single processor so everything will be sluggish, and in recent PC's has low or no real benefit in latency.
That has the downside of bringing the PC to a single processor so everything will be sluggish, and in recent PC's has low or no real benefit in latency.
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