Message: 1 Date: Mon, 25 Mar 2013 15:25:31 -0400 From: "Kent A. Reed" <kentallanr...@gmail.com> Subject: Re: [Emc-users] Latency problem To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Message-ID: <5150a4ab.6050...@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed On 3/25/2013 9:56 AM, Bj?rn wrote: >> <snipping off previous discussion> now i have tested: boot with isolcpu(big >> improvement in general latency but still spikes) >> turn of smi, (improvement in general latency but still spikes) >> 'idle=poll' and 'nohlt'(little or no effect) >> >> acpi = off and api=off (little or no effect) >> >> For the moment i have been running the system for 1,5 hour and have - >> servothread interval 999655 and max jitter 4495 ns - base thread interval >> 32069 max jitter 7190. >> >> witch i am very happy with, but if i run for several hours i still get >> spikes up to 50000 and above. >> i suspect Michael are right, the problem is related toidle/powersave states. >> >> I have no settings in bios to turn of ACPI >> my bios is: MWNT10N.86A.0083.2011.0524.1600 >> is this the same as others are running? and do you have option to turn off >> ACPI from bios? > Bj?rn: > > I don't have an Intel D525MW in my stable of motherboards but I do have > an ASUS AT5NM10-I whose numbers I posted last year to the table of > latency-test results in the Wiki. Your "pre-spike" numbers are > reasonably consistent with the numbers I got. The "best" numbers I > posted were obtained with hyperthreading turned off in the BIOS and > isolcpus=1 set in the boot parameters. Nothing heroic. I did my tests > long before list discussions brought out the importance of other > parameter settings like idle=poll. In recent shortterm tests, I also > have not seen dramatic improvements manipulating these parameters. > > Testing this ASUS board, I haven't seen the kinds of spikes you are > experiencing. (Just for the record, I was testing LinuxCNC over 10.04LTS > with the RTAI kernel). > > I'm curious to know what all is attached to your motherboard, especially > anything attached via USB. I once had a motherboard that started > misbehaving when I switched from a PS/2 mouse to a USB mouse and a > number of us have seen the simple act of plugging in a USB thumbdrive > cause bursts in latency numbers. Is it possible you have a peripheral > interface/device that is waking up on the same time scale as the > occurrence of your spikes? > > My system guy never failed to ask if the computer were plugged to a live > outlet as his first step in diagnosing problems. Obviously your computer > is plugged in but how are the power supply and the AC mains? Adequate, > stable, clean? > > Regards, > Kent > > I bought the power supply together with the D525MW board. here are a link - http://www.ebay.com/itm/160721043666?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649 it says 60w but i don't know the quality of it. I will test another one when i get it in a week.
I to have seen the problem regarding USB and latency on my mill and plasma table. I told the guys in the shop to transfer files from USB thumbdrive to desktop and remove USB thumbdrive before running Linuxcnc at first i started out with a wireless mouse and keypad with a USB dongle, but replaced it with USB when the spikes appeared. i have now tested using a ps2 mouse, i do not have a ps2 keyboard so that's still USB. but i have tried to disconnect and connect it while the latency-test where running and no spikes i left it out and no other USB devices connected, let the test run for 5-6 hours but still spikes at 50000 - 60000. just a tought, what about SATA and SSD disk could that have some influence on the latency? But anyway i still think i have some powersave funktion running. I noticed that the screen was black when i come back to the office, witch i havent seen before. I think i have to go back to check my bios version to see if there are an uppgrade or alternative. Regards Bjørn ------------------------------------------------------------------------------ Own the Future-Intel® Level Up Game Demo Contest 2013 Rise to greatness in Intel's independent game demo contest. Compete for recognition, cash, and the chance to get your game on Steam. $5K grand prize plus 10 genre and skill prizes. Submit your demo by 6/6/13. http://p.sf.net/sfu/intel_levelupd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
