OpenVPN 是透過 PPPoE 上網時，因為固定時間 IP 會變化，此時 OpenVPN 預設的 client 會因為斷線而無法重新連上，而且設了 maximum connection 之類的參數也沒有用
這時候就要拿掉 persist-tun 這個參數，將該行 Mark 起來就好
; persist-tun
Category Archives: Computer
OpenVPN Client Re-connect Problem When IP Changed
Posted by richliu
on 2022/04/26
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Build Linux kernel 5.x on CentOS 7
Posted by richliu
on 2021/11/15
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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.
ARM64 Linux Performance Tuning
Posted by richliu
on 2021/05/19
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Intel Coffee Lake Ubuntu Linux 速度太慢
Posted by richliu
on 2021/04/15
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這個也是怪自己，最近因為 Windows VM 不知道為什麼速度變很慢，所以改用 Linux 跑 VM ，雖然 Linux 下 VM 速度比 Windows 快，但是整體的感覺還是慢．本來以為是我的 i5-9600k VM 表現不好，但是看著 CPU utilization 感覺還是怪
Read more »Windows 10 存取 Ubuntu Samba 問題
Posted by richliu
on 2021/04/15
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[Gentoo][ARM64] Compile qtwebengine fail
Posted by richliu
on 2021/03/23
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If CPU number is too much, compile qtwebengine will fail, seems ninja compile issues.
it better to reduce CPU number under 8, batter number is 4 or 6.
just put MAKEOPTS=”-j 4″ on your /etc/portage/make.conf
It can be roll back after compile qtwebengine.
modify package.env can support special MAKEOPTS command on some packages.
ex:
echo "dev-qt/qtwebengine lowcpu.conf" | sudo tee -a /etc/portage/package.env
mkdir -p /etc/portage/env
echo "MAKEOPTS=\"-j4\"" | sudo tee /etc/portage/env/lowcpu.confref.
[SOLVED] emerging qtwebengine-5.7.1
Memory problems on QtWebEngine build
htop more column for mass CPUs
Posted by richliu
on 2021/03/22
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htop can support multiple columns in one screen, just press F2 enter setup mode, and change left column and right column to CPUs (1-4/8) [Bar] and CPUs (5-8/8) [Bar]
htoprc , put it on /etc/htoprc or ~/.config/htop/htoprc
# Beware! This file is rewritten by htop when settings are changed in the interface.
# The parser is also very primitive, and not human-friendly.
fields=0 48 17 18 38 39 40 2 46 47 49 1
sort_key=1
sort_direction=1
hide_threads=0
hide_kernel_threads=1
hide_userland_threads=0
shadow_other_users=0
show_thread_names=0
show_program_path=1
highlight_base_name=0
highlight_megabytes=1
highlight_threads=1
tree_view=0
header_margin=1
detailed_cpu_time=0
cpu_count_from_zero=0
show_cpu_usage=1
show_cpu_frequency=0
update_process_names=0
account_guest_in_cpu_meter=0
color_scheme=0
enable_mouse=1
delay=15
left_meters=LeftCPUs4 Memory Swap
left_meter_modes=1 1 1
right_meters=RightCPUs4 Tasks LoadAverage Uptime
right_meter_modes=1 2 2 2
KDE Plasma CPU High Usage After Install Nvidia Driver
Posted by richliu
on 2021/03/07
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My notebook with RTX3060 has this issue after do something I don’t know. OS is Ubuntu 18.04
Everything is ok after first time install RTX3060, there is no high cpu issue, but after install IME(gcin), nomachine and anydesk and do something I don’t remember, plasma high cpu usage issue happened.
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