I just bought one of these:

http://www.amazon.com/CompuLab-fit-PC2- ... pd_cp_pc_1

It came with Ubuntu 9.10 preinstalled, running kernel 2.6.31-34-fitp. I've barely even done anything with it yet, just get it to boot up in text mode, copy some of my files over, and do apt-get update, apt-get upgrade ... but it seems that at least once a day, I get a kernel bug that causes me to lose all network connectivity.

It begins: ...and I have the full text posted at http://serverfault.com/questions/137631 ... kernel-bug

Has anyone seen this before? I'm considering reporting it, but Ubuntu seems to want a great deal of information in their kernel bug reports, and I'd hate to go through all the trouble of meticulously gathering that information just to find out that it's a well-known bug with a workaround, or even a completely solved one.

How can I find out if the bug is known, short of picking what appear to be interesting strings and typing them into Google? (Note: that approach hasn't been working.)

Do you have "Processur full speed" set to "GV3 Only" instead "C-States" in the BIOS?

I haven't changed anything in the BIOS; Processor Full Speed is set to "Enabled" .. should I change it?

Yes, set it to "GV3 Only"

Will do. Is this a known issue? If you have a link to all the nerdful details, I'd love to read it.

I'm afraid the problem is still happening. I'll mention it on the other thread.

As mentioned on the other thread, turning off hyperthreading made the problem go away.

Then my guess is that it's a software issue. If you still want hyper threading enabled there are some things you can try:

* Do you have any usb devices attached? You seem to have some modules loaded that indicates this. Try disconnecting them and reboot.

* When putting heavy load on the ethernet interface, do you route this through the Wifi interface? Might be a bug in the rt2860sta driver.

* Try blacklisting modules that aren't critical for normal operation to see if you can narrow down the problem. Just unloading them after a boot is not enough since the damage may already have been done when the driver loads.

* IEGD is a proprietary driver for a very complicated piece of hardware. Try blacklisting it and use the VESA driver (will be slow) when trying to reproduce the problem.

Good luck

C-States and Hyperthreading working

I have a Fit-pc2i 1.2 from two weeks ago, I tried several distributions and Ubuntu 9.10 is the best work by following the instructions on the wiki ( http://www.fit-pc2.com/wiki/index.php?t ... buntu_9.10 ). Finally I decided to use Ubuntu 9.10 but became unstable when activated Hiperthreading and C-States in the Bios.

I compiled a new kernel based on the original 2.6.31-34-fitpc2 to add a patch that enables support for Reiserfs4 filesystem, without making any other changes:

zcat /proc/config.gz | diff -uN /boot/config-2.6.31-34-fitpc2 -
--- /boot/config-2.6.31-34-fitpc2 2010-06-16 11:01:59.000000000 +0200
+++ - 2010-07-06 18:28:55.478595100 +0200
@@ -1,9 +1,7 @@
-
-
#
# Automatically generated make config: don't edit
-# Linux kernel version: 2.6.31-34-fitpc2
-# Wed Jun 16 11:23:06 2010
+# Linux kernel version: 2.6.31-34-fitpc2i
+# Sun Jun 27 18:56:14 2010
#
# CONFIG_64BIT is not set
CONFIG_X86_32=y
@@ -3216,7 +3214,7 @@
CONFIG_EXT2_FS_SECURITY=y
# CONFIG_EXT2_FS_XIP is not set
CONFIG_EXT3_FS=y
-# CONFIG_EXT3_DEFAULTS_TO_ORDERED is not set
+CONFIG_EXT3_DEFAULTS_TO_ORDERED=y
CONFIG_EXT3_FS_XATTR=y
CONFIG_EXT3_FS_POSIX_ACL=y
CONFIG_EXT3_FS_SECURITY=y
@@ -3230,6 +3228,8 @@
CONFIG_JBD2=y
# CONFIG_JBD2_DEBUG is not set
CONFIG_FS_MBCACHE=y
+CONFIG_REISER4_FS=m
+# CONFIG_REISER4_DEBUG is not set
CONFIG_REISERFS_FS=m
# CONFIG_REISERFS_CHECK is not set
CONFIG_REISERFS_PROC_INFO=y

From yesterday I get working well with C-States Hiperthreading when I added on boot the following parameters to the kernel: acpi_irq_balance acpi_osi=Linux

menuentry "Ubuntu, Linux 2.6.31-34-fitpc2i" {
recordfail=1
if [ -n ${have_grubenv} ]; then save_env recordfail; fi
set quiet=1
insmod reiserfs
set root=(hd0,1)
search --no-floppy --fs-uuid --set 3b2e9f50-b894-4eca-a8e4-959ca4b2cb30
linux /boot/vmlinuz-2.6.31-34-fitpc2i root=UUID=3b2e9f50-b894-4eca-a8e4-959ca4b2cb30 ro quiet splash acpi_irq_balance acpi_osi=Linux
initrd /boot/initrd.img-2.6.31-34-fitpc2i
}

# uptime
18:46:35 up 1 day, 2:14, 6 users, load average: 0.40, 0.55, 0.66

# powertop
PowerTOP 1.11 (C) 2007, 2008 Intel Corporation

Collecting data for 5 seconds

Your CPU supports the following C-states : C1 C2 C4 C6
Your BIOS reports the following C-states : C1 C2 C4 C6
Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 8.1%) 1.60 Ghz 4.2%
polling 0.0ms ( 0.0%) 1333 Mhz 0.1%
C1 mwait 0.0ms ( 0.8%) 1067 Mhz 0.1%
C2 mwait 0.1ms ( 0.2%) 800 Mhz 95.7%
C4 mwait 0.4ms ( 0.1%)
C6 mwait 8.0ms (90.8%)
Wakeups-from-idle per second : 351.4 interval: 15.0s
no ACPI power usage estimate available

Top causes for wakeups:
68.5% (541.4) <kernel IPI> : Function call interrupts
8.9% ( 70.5) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
3.0% ( 23.8) USB device 4-1.3 : Microsoft Wireless Optical Mouse® 1.00 (Microsoft)
2.6% ( 20.7) <interrupt> : iegd@pci:0000:00:02.0, eth0
2.6% ( 20.3) <interrupt> : uhci_hcd:usb4, mmc2
2.5% ( 19.7) <kernel core> : hrtimer_start (tick_sched_timer)
2.2% ( 17.4) <kernel IPI> : Rescheduling interrupts
1.5% ( 11.5) USB device 1-1 : NovaT 500Stick (Hauppauge)
1.2% ( 9.9) geyes_applet2 : hrtimer_start_range_ns (hrtimer_wakeup)
1.2% ( 9.6) <interrupt> : ehci_hcd:usb1

# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 28
model name : Intel(R) Atom(TM) CPU Z530 @ 1.60GHz
stepping : 2
cpu MHz : 800.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl vmx est tm2 ssse3 xtpr pdcm movbe lahf_lm tpr_shadow vnmi flexpriority
bogomips : 3191.63
clflush size : 64
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 28
model name : Intel(R) Atom(TM) CPU Z530 @ 1.60GHz
stepping : 2
cpu MHz : 800.000
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
apicid : 1
initial apicid : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl vmx est tm2 ssse3 xtpr pdcm movbe lahf_lm tpr_shadow vnmi flexpriority
bogomips : 3191.94
clflush size : 64
power management: