HIGHMEM and latency
03 Apr 2009 22:29 #48
by WildRice
HIGHMEM and latency was created by WildRice
I noticed a message in my dmesg log saying to use a kernel with HIGHMEM enabled. Is there a reason it is not, and would installing more memory help latency?
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04 Apr 2009 11:26 #49
by BigJohnT
Replied by BigJohnT on topic Re:HIGHMEM and latency
I'm not sure if more memory would help. Here is a couple of links on latency.
wiki.linuxcnc.org/cgi-bin/emcinfo.pl?TroubleShooting
rtai.dk/cgi-bin/gratiswiki.pl?Latency_Killer
John
wiki.linuxcnc.org/cgi-bin/emcinfo.pl?TroubleShooting
rtai.dk/cgi-bin/gratiswiki.pl?Latency_Killer
John
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04 Apr 2009 21:43 #50
by alex_joni
Replied by alex_joni on topic Re:HIGHMEM and latency
Are you using dapper? On dapper we have HIGHMEM disabled, because memory > 1G cause problems with the rtai version that is packaged.
More memory certainly won't help much with latency.
Regards,
Alex
More memory certainly won't help much with latency.
Regards,
Alex
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04 Apr 2009 23:16 #51
by WildRice
Replied by WildRice on topic Re:HIGHMEM and latency
Yes, I am running Dapper. I originally tried to install Hardy, but the liveCD would not install on my SherlineCNC. It has been several weeks since I tried, but but it told me that there was some kind of IO error on my hard disk. Dapper did not find any error.
I never have a problem, unless I have a VNC session active, then I get glitches and get messages to check my latency. I know that Linux likes lots of memory, so I thought that it might help.
I never have a problem, unless I have a VNC session active, then I get glitches and get messages to check my latency. I know that Linux likes lots of memory, so I thought that it might help.
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