Unanswered Questions
1,239 questions with no upvoted or accepted answers
11
votes
0
answers
3k
views
What network connections are not seen by netstat/lsof/ss?
Network monitoring tools ss, lsof -i, netstat -ltupw and similar have limitations like namespace and thus they don't show the whole machine connections. (for namespace created with ip we can see other ...
- 15k
9
votes
1
answer
5k
views
Linux 3.x fails assigning PCI BAR memory
I got an IBM x3850 type 8864 machine, I can successfully boot using a 2.6.32 kernel but when I try to use a 3.10 kernel or newer the kernel fails to initialize all PCI slots (I can fix this (manually),...
CommunityBot
- 1
8
votes
0
answers
2k
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Why are block sizes limited by page size in Linux?
In many (all?) file systems that Linux uses, including ext2/3/4, the maximum block size is the page size of the architecture Linux is running on, ie. 4KiB on x86. Why is there this limit? Might this ...
- 654
7
votes
0
answers
2k
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How to read the output of the show-memory-usage SysRq?
I couldn’t find any (recent) documentation on reading the output of the show-memory-usage SysRq (Alt+SysRq+m). So what can one learn from looking at it?
Here is an example output form my box (Kernel ...
- 203
6
votes
0
answers
6k
views
NFS Cannot allocate memory
The other night I was trying to restart NFS services but then I received the following error messages:
kernel: [81818.428785] nfsd: unable to allocate nfsd_file_hashtbl
rpc.nfsd[15567]: error starting ...
- 173
6
votes
0
answers
190
views
Kernel config for keyboard special LEDs
I'm building a 4.9 linux kernel (which is working great) for my T460s. The F1 key has a led that shows if sound is muted. I can't get this LED to work even when enabling all kinds of LED-relevant ...
- 553
6
votes
0
answers
414
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Kernel config diffs - better way to maintain
I maintain one Linux distro (LEAF) with multiple kernel targets, so it needs to have multiple kernel configs (one reference config + usual patch files for other targets). But this adds headache on ...
6
votes
1
answer
1k
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What does "make install" do in the Makefile that comes with the kernel?
I'm trying to identify what does make install do with the kernel and what does the actual "install" of the kernel once it's been compiled means.
The problem is I can't really identify the target (...
- 101
5
votes
0
answers
3k
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Conflict between linux kernel and nvme drives. Faulty power saving mode enabled? ("nvme_core.default_ps_max_latency_us=0 pcie_aspm=off" didn't help)
I have two barely identical servers. Both with:
BIOSTAR GTA690 motherboard
Intel CPU
Same amount of RAM & disk layout
PVE distribution (debian based hypervisor). Kernel 5.19.17-1-pve.
I have ...
- 1
5
votes
1
answer
2k
views
QEMU kernel for raspberry pi 3 with networking and virtio support
I used the QEMU(qemu-system-aarch64 -M raspi3) for emulating the Raspberry pi3 with the kernel from the working image.
Everything was working but there was no networking.
qemu-system-aarch64 \
-...
- 2,802
5
votes
1
answer
2k
views
How does one disable an option enabled by default in Kconfig?
Let's say I have an option:
config SETTING_WITH_DEFAULT
bool "Some setting which defaults to y"
default y
I want to make an option which would deselect this default:
config ...
CommunityBot
- 1
5
votes
0
answers
1k
views
How does linux decide the load address and entry point when execve an ELF?
When linux execve() an ELF, it will mmap that ELF into the process's memory space and start to run code from the entry point. But how does the kernel decide the load address and entry point of the ELF?...
- 16.9k
5
votes
1
answer
3k
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How to check if If i2c-hid and hid-rmi are not used for touchpad?
I'm seeing the following warning in dmesg:
[ 2.631179] psmouse serio2: synaptics: Your touchpad (PNP: SYN1218 PNP0f13) says it can support a different bus. If i2c-hid and hid-rmi are not used, you ...
CommunityBot
- 1
5
votes
0
answers
5k
views
Kernel compiling - Error during sync of the configuration
I am trying to compile the 4.19 kernel on my Linux Mint machine. I copied my current config (which is from 4.15), opened make menuconfig in order to append a local version string, saved it and then ...
5
votes
0
answers
1k
views
CPU high load native_queued_spin_lock
I'm using Debian 9(stretch edition) kernel 4.9., hp dl385 g7 server with 32 cpu cores. NIC queues are tied to processor cores. Server is shaping traffic (iproute2 and htb discipline + skbinfo + ipset +...
- 2,583