Category Archives: Linux

Ubuntu/Fedora PXE Boot

Posted by on 2023/04/16 No comments

Before setting up Ubuntu/Fedora PXE boot, it needs to prepare several items on your PXE server:

  • * The Ubuntu/Fedora rootfs on tftp/nfs server:
    It can refer to the my article MIPS/ARM64 Debian/Ubuntu debootstrap for building the Ubuntu rootfs.
    If want to build the Fedora rootfs, it can install a new system on qemu and copy it from the qcow2 image.
  • NFS Server:
    Assume the rootfs for Ubuntu is on /nfs/ubuntu2204 and Fedora 36 is on /nfs/fedora36.
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Build CentOS 8 Kernel from Source on ARM64 Platform

Posted by on 2022/12/08 No comments

Due to CentOS website document cannot provide a simple instruction to build CentOS 8 stream with some easy steps. So, I make a note to record these procedures about how to build it.

Detail description and instruction, please refer to CentOS document, but if you have read the document and still don’t know how to do that, it can follow my instruction to build the kernel from CentOS 8 kernel source.

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FF14 中華電信 LAG 問題

Posted by on 2022/11/28 No comments

看到有人說改 MTU 可以解決 FF14 FFXIV 的延遲問題，【心得】中華電信FF14晚間卡頓解決方式
這個之前有看到過，但是忘了下去試

猜測原理應該藉由中華電信內部設定會讓小封包先通行的設定，達到穩定 ping 值的目地

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multichase on Centos 8 Compile Issue

Posted by on 2022/11/08 No comments

muttichase is a google open source tool which can run latency, bandwidth and loader-latency tool,
it can support both x86 and ARM64 platforms.
but it will have compile error on CentOS 8

root cause is this package needs static lib support, but regular CentOS doesn’t have it. 

# make                                                                             cc -g -O3 -static -pthread  multichase.o permutation.o arena.o util.o  -lrt -lm -o multichase
/usr/bin/ld: cannot find -lrt                                                                                 /usr/bin/ld: cannot find -lm                                                                                  /usr/bin/ld: cannot find -lpthread
/usr/bin/ld: cannot find -lc                                                                                  collect2: error: ld returned 1 exit status                                                                    make: *** [<builtin>: multichase] Error 1
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BMC Watchdog

Posted by on 2022/10/27 No comments

這個時間有點久了，我也忘了很多細節，畢竟用到的次數太少，不過就將記得的寫一篇，以後可以自己回來查資料
如果是有 BMC 的機器，BMC 內部有一個 watchdog 可以監視 host 系統運行的狀況，這個拿來放在遠端重啟 host 非常好用

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Linux Kernel Install Fail Because Broadcom NetXtreme 100G DKMS Driver Build Failed.

Posted by on 2022/09/27 No comments

Environment is CentOS 8, broadcom 100G NetXtreme-E series driver .
Host : Ampere Altra Platform

if rebuild the CentOS kernel and there was previous Broadcom nic driver alredy installed, it will trigger dkms to rebuild the driver on current kernel.

make install error as following

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CentOS 其他

Posted by on 2022/08/17 No comments

筆記集中文

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Ampere Altra Mt. Jade OpenBMC and EDKII build guide on ARM64 platform

Posted by on 2022/06/23 No comments

Ampere announce Altra CPU, it’s a 80 cores ARM64v8 CPU for cloud native workloads. Altra Max CPU is 128 cores. Follow the CPU, Ampere also has a CRB (customer reference board) named Mt. Jade, and Ampere also open source OpenBMC and EDKII source code for Mt. Jade platform.

This article is personal note, all information can be found from internet. And open source project keeps going, it might be some minor differences when you find this article.

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Build Ampere CentOS Kernel

Posted by on 2022/03/17 No comments

Personal Note

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Build Linux kernel 5.x on CentOS 7

Posted by on 2021/11/15 No comments

This article’s procedure was tested in Ampere Altra CPU platform, but suppose that x86 system also can use this procedure.

CentOS 7’s gcc is too old to compile Linux kernel 5.x, and it can use another package named “software collections(SCL)” to install newer gcc to build Linux kernel.

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