D510MO
09 Jun 2011 11:41 #10389
by BigJohnT
I have a couple of D510MO's and right out of the box I get just under 10,000us latency which is good. After following some conversations on these I decided to see if I could improve on that. I pressed F2 at boot up and turned off hyperthreading and got the latency down to 7,800us... not bad.
John
John
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09 Jun 2011 16:14 - 09 Jun 2011 16:14 #10393
by BigJohnT
That is without isolcpu, I did find this on the wiki site about grub2 and 10.04.
wiki.linuxcnc.org/cgi-bin/emcinfo.pl?The..._Parameter_And_GRUB2
and plan on trying that next just to see if it gains me anything.
And after running the latency test about 6 hours the max latency is 8,835.
John
wiki.linuxcnc.org/cgi-bin/emcinfo.pl?The..._Parameter_And_GRUB2
and plan on trying that next just to see if it gains me anything.
And after running the latency test about 6 hours the max latency is 8,835.
John
Last edit: 09 Jun 2011 16:14 by BigJohnT.
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10 Jun 2011 06:55 - 10 Jun 2011 07:00 #10403
by step4linux
Replied by step4linux on topic Re:D510MO
isolcpu should bring another improvement.
I have been running 2.4.6 on a foxconn dual atom board for a while with HT off and isolcpu 1.
I think there was never jitter well above 3 usec. EDIT: correction 5 usec
It might be I have not stressed it too much, only firefox.
Gerd
I have been running 2.4.6 on a foxconn dual atom board for a while with HT off and isolcpu 1.
I think there was never jitter well above 3 usec. EDIT: correction 5 usec
It might be I have not stressed it too much, only firefox.
Gerd
Last edit: 10 Jun 2011 07:00 by step4linux.
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10 Jun 2011 11:25 - 10 Jun 2011 11:28 #10406
by BigJohnT
After 24 hours of running the latency test it was up to 9400us. I've just did the isolcpu as shown on the wiki so we will see what that does.
wiki.linuxcnc.org/cgi-bin/emcinfo.pl?The..._Parameter_And_GRUB2
Right off the start the latency is 5270us... we will see what we get after running a while.
John
wiki.linuxcnc.org/cgi-bin/emcinfo.pl?The..._Parameter_And_GRUB2
Right off the start the latency is 5270us... we will see what we get after running a while.
John
Last edit: 10 Jun 2011 11:28 by BigJohnT.
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10 Jun 2011 13:45 #10408
by step4linux
Replied by step4linux on topic Re:D510MO
Right off the start I was at 3 us, now after some hours I'm at 7.204.
I have a joypad connected by USB, and did also some files copying back and forth to a USB stick.
Used also firefox, every now and then.
What is your test bench, John ?
Gerd
I have a joypad connected by USB, and did also some files copying back and forth to a USB stick.
Used also firefox, every now and then.
What is your test bench, John ?
Gerd
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10 Jun 2011 14:35 - 10 Jun 2011 14:35 #10410
by BigJohnT
Last edit: 10 Jun 2011 14:35 by BigJohnT.
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10 Jun 2011 15:08 #10411
by step4linux
Replied by step4linux on topic Re:D510MO
I mean, how do you stress your computer, run additional software, attach additional devices, or anything else to force worst case latency
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