On 7/31/2012 11:52 AM, Todd Zuercher wrote: > Ok, This is what I've found so far. > > Board: BOXD2700MUD (from Newegg) > 2g Memory (came with board) > Sata 750g HD > VGA monitor running 1024x768 > LinuxCNC 2.5 on Ubuntu 10.04 (installed from Live CD) > > Running the Latency test from the gui menu with Firefox and 2 sets of > glxgears running I got. > > With no adjustments out of the box: > Jitter on servo thread of 22000 > Base thread of 33000 > A little disappointing. > > Rebooted and turned off hyperthreading: > Jitter on servo thread of 19000 > Base thread of 22000 > A little better. > > Set up isolcpus=1 as per > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?The_Isolcpus_Boot_Parameter_And > _GRUB2 and with hyperthreading still turned off, and things got a whole > lot better. > Jitter on servo thread of 9300 > Base thread of 9600 > But it's only been running 15 min or so. > > At first it was as low as 2200&3500 and I thought wow this is really > good but dragging things to other desktops bumped it up. All in all I > think it will be quite serviceable for our purpose. > > I will play with the bios settings some more when I have a little more > time. > >
Todd: Thanks for your detailed report. Four points: 1) did you use PS/2 or USB ports for keyboard and mouse? If USB, then it would be nice to know if instead using PS2/2 would affect your finding "At first it was as low as 2200&3500 and I thought wow this is really good but ...." Some have seen a USB effect and others have not. I don't think it is just a matter of fancy-schmanzy external devices but also a matter of the BIOS and all the stuff that happens on the "SouthBridge" side of the motherboard. (Ronald Reagan said it well, "Trust but verify.") 2) have you tried running this board headless and interacting with a remote XServer? As you can see from the numbers I posted to the Wiki latency-test page some time ago for my ASUS AT5NM10-I, that combination gave me my best numbers. 3) speaking of the Wiki latency test-page, please post your numbers to it:-) 4) finally, I regret to say that Intel has already officially announced it will discontinue production of the Atom D2700 chip in September of this year (wow, it lasted a whole year!). My guess is all boards of this type will disappear from retail channels before the end of the year. Regards, Kent ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
