#linuxcnc-devel | Logs for 2012-03-05

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[16:32:27] <GoSebGo> Did you guys see the fp bug that was just fixes in linux 3.3-pre-whatever? That would have bit us and precious few other people
[16:44:19] <cradek> nope
[16:46:34] <GoSebGo> Gp corruption when running a 32-bit kernel on a 64-bit processor, and doing some other specific things
[16:46:43] <GoSebGo> Not gp, fp
[16:46:58] <GoSebGo> But anyway, fixed now
[16:47:14] <cradek> wow, I'd figure that half the world is doing that
[16:47:45] <cradek> doesn't everything still say "if you don't know what you're doing or what your computer is, use the 32 bit install"?
[16:48:51] <cradek> PC (Intel x86) desktop CD: For almost all PCs. This includes most machines with Intel/AMD/etc type processors and almost all computers that run Microsoft Windows, as well as newer Apple Macintosh systems based on Intel processors. Choose this if you are at all unsure.
[16:49:03] <cradek> (from ubuntu.com/precise/)
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[17:00:51] <mozmck> Looks like the Precise "live CD" will not fit on one cd.
[17:01:14] <jepler> some version of kernel (bdi era) corrupted userspace x87 registers when doing FP math in realtime. it actually was hard to notice, and mostly manifested as weird visual artifacts in AXIS.
[17:01:24] <GoSebGo> cradek: huh, you're right
[17:01:32] * GoSebGo is surprised
[17:02:06] <cradek> so far, I've always used 32 bit installs on desktop/laptop machines
[17:02:15] <GoSebGo> I've been installing 64-bit systems everywhere for years, except where i run linuxcnc
[17:02:18] <cradek> (but 64 bit on my freebsd servers)
[17:02:18] <jepler> I've been using 64-bit for ages
[17:02:35] <jepler> it's a moderate pain if you want to use non-Free software that only has 32-bit editions
[17:02:51] <jepler> otherwise it's absoulutely fine
[17:03:07] <cradek> yeah, sometimes painful, and the payoff is exactly zero (for me)
[17:03:21] <jepler> but .. the cred!
[17:03:24] <cradek> ?
[17:04:56] <jepler> the respect and esteem you will receive from others
[17:05:20] <cradek> if I cared about that, I'd wear pants too
[17:05:53] <jepler> GoSebGo: do you have a link to the discussion? I don't follow lkml these days but this sounds interesting
[17:07:00] <jepler> .. I looked around on the lkml.org archive but didn't immediately find it
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[17:10:05] <GoSebGo> It was on lwn last week
[17:10:37] <cradek> was this problem newly introduced and then fixed in 3.3 or is it old and only fixed in 3.3?
[17:11:12] <GoSebGo> I think it was a regression introduced and fixed in 3.3
[17:11:24] <cradek> yay
[17:11:34] <jepler> http://sourceforge.net/mailarchive/forum.php?thread_name=200509190411.05805.paul_c%40users.sourceforge.net&forum_name=emc-developers
[17:11:38] <jepler> boy that was a long time ago
[17:12:20] <jepler> (wow look at all the broken QP in that thread)
[17:14:30] <jepler> this article? http://lwn.net/Articles/484042/
[17:14:43] <cradek> it always bugged me that he didn't say what he did to fix it
[17:15:08] <jepler> if so, it apparently affected 3.2.7
[17:15:15] <cradek> bdi was strictly need-to-know
[17:15:28] <cradek> but yeah, long time ago, and yay for that
[17:18:39] <cradek> whee http://emergent.unpythonic.net/index.cgi-files/sandbox/bdi-gears.png
[17:19:12] <GoSebGo> Heh
[17:23:01] <jepler> there have been a lot of days when I questioned the decision to use OpenGL in AXIS
[17:23:06] <jepler> unfortunately, those days are still going on
[17:24:15] <cradek> you'd think we'd have reliable opengl by now, but thanks to compositing, perhaps we can hope for it in another decade.
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[18:39:04] <skunkworks> It sounds like mach4 will us opengl for its preview. Sounds like whatever is being used now causes issues with step generation on long programs.
[18:39:17] <skunkworks> sounds like.
[18:45:44] <skunkworks> is linuxcnc.org down?
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[19:11:40] <JT-Shop> linuxcnc.org is broken for me too
[19:14:53] <skunkworks> Database Error: Unable to connect to the database:Could not connect to MySQL
[19:15:14] <skunkworks> back up
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