<div dir="ltr"><font face="georgia,serif"><br></font><br><div class="gmail_quote">On Wed, Jul 18, 2012 at 1:54 PM, Oleg Goldshmidt <span dir="ltr"><<a href="mailto:pub@goldshmidt.org" target="_blank">pub@goldshmidt.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><font face="georgia,serif">Hi,<br><br>I have a new computer with CentOS 6. I happened to start a rather long task that I think is memory-, but not CPU-, intensive. Just for the fun of it I started top, and was very surprised to see that the first two lines were always<br>
<br style="font-family:courier new,monospace"><span style="font-family:courier new,monospace"> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND </span><br style="font-family:courier new,monospace">
<span style="font-family:courier new,monospace"> 38 root 20 0 0 0 0 R 66.2 0.0 2671:58 kacpid </span><br style="font-family:courier new,monospace">
<span style="font-family:courier new,monospace"> 39 root 20 0 0 0 0 S 32.6 0.0 1320:31 kacpi_notify </span><br style="font-family:courier new,monospace" clear="all">
</font><br clear="all"><span style="font-family:georgia,serif">It looks a lot like various issues with laptops from way back, e.g., <a href="https://bugzilla.redhat.com/show_bug.cgi?id=451896" target="_blank">https://bugzilla.redhat.com/show_bug.cgi?id=451896</a>, <a href="https://bugzilla.redhat.com/show_bug.cgi?id=454954" target="_blank">https://bugzilla.redhat.com/show_bug.cgi?id=454954</a>, etc. This one is a regular PC working as a server in a cool server room, just arrived about a week ago. 2CPUs, 4G of RAM, 2 HDs in software RAID1, nothing special. Kernel 2.6.32-220.23.1.el6.x86_64 (RedHat).</span><br style="font-family:georgia,serif">
<br style="font-family:georgia,serif"><span style="font-family:georgia,serif">I understand it may be a BIOS issue with ACPI implementation, or it may be a kernel bug (though I'd expect those to be sorted out by now, given that the general issue is old). I have not yet tinkered with the BIOS or the kernel (may do it on Sunday when customers sleep), but I am vaguely concerned that if I manage to switch ACPI off in the BIOS I may miss real overheating (of which this may be a symptom - ?).</span><br clear="all">
<br></div></blockquote><div><br><span style="font-family:georgia,serif">Nothing helped - upgraded the kernel (well, not much, to 2.6.32-279), tried to boot with "acpi_osi=", tinkered with BIOS power settings (disabled everything), but the offending tasks disappeared from the top of top(1) only after I did</span><br style="font-family:georgia,serif">
<br style="font-family:georgia,serif"><span style="font-family:georgia,serif">echo disable > /sys/firmware/acpi/interrupts/gpe_all</span><br style="font-family:georgia,serif"></div></div><br style="font-family:georgia,serif">
<span style="font-family:georgia,serif">As far as I understand the issue may be flaky HW or cable or something, but I do not know what it is. I also do not understand completely what the possible ramifications of the above action may be. So far I added the above command to /etc/rc.local.</span><br style="font-family:georgia,serif">
<br style="font-family:georgia,serif"><span style="font-family:georgia,serif">If anyone has any insights, do let me know.</span><br style="font-family:georgia,serif"><br style="font-family:georgia,serif"><span style="font-family:georgia,serif">-- </span><br style="font-family:georgia,serif">
<span style="font-family:georgia,serif">Oleg Goldshmidt | </span><a style="font-family:georgia,serif" href="mailto:oleg@goldshmidt.org" target="_blank">oleg@goldshmidt.org</a><br>
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