随笔分类 -  006_Linux内核/操作系统原理

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kernel module in UEFI secure boot --- insmod: ERROR: could not insert module lkm_hello.ko: Operation not permitted
摘要：# insmod lkm_hello.koinsmod: ERROR: could not insert module lkm_hello.ko: Operation not permitted 解决办法其实就是因为修改.ko文件是修改的linux内核文件，所以被bios的安全启动保护给禁止了而已。 阅读全文
posted @ 2022-11-20 22:58 张同光 阅读(581) 评论(0) 推荐(0) 编辑
Linux各版本源代码-查看-Linux Cross Reference
摘要：https://elixir.bootlin.com/linux/latest/sourceLinux各版本源代码-查看-Linux Cross Reference 阅读全文
posted @ 2022-09-16 08:22 张同光 阅读(159) 评论(1) 推荐(0) 编辑
TCP Dup ACK linux kernel 3.2
摘要：https://serverfault.com/questions/799421/tcp-dup-ack-linux-kernel-3-2 The Problem Your throughput issues appear to be caused by a buggy implementation 阅读全文
posted @ 2022-06-01 17:10 张同光 阅读(291) 评论(0) 推荐(0) 编辑
tcp: avoid min-RTT overestimation from delayed ACKs
摘要：https://patchwork.ozlabs.org/project/netdev/patch/20180117201101.14137-2-ycheng@google.com/ Message ID 20180117201101.14137-2-ycheng@google.comState A 阅读全文
posted @ 2022-01-15 23:45 张同光 阅读(59) 评论(0) 推荐(0) 编辑
Estimating the Round-Trip Time in TCP
摘要：https://networkengineering.stackexchange.com/questions/69562/estimating-the-round-trip-time-in-tcp I was reading a textbook which says: Let’s begin ou 阅读全文
posted @ 2022-01-12 21:49 张同光 阅读(73) 评论(0) 推荐(0) 编辑
内核tcp的定时器管理
摘要：http://abcdxyzk.github.io/blog/2013/09/27/kernel-net-tcp-timer/ 在内核中tcp协议栈有6种类型的定时器： 1 2 3 4 5 6 7 1 重传定时器。 2 delayed ack定时器 3 零窗口探测定时器 上面三种定时器都是作为tcp 阅读全文
posted @ 2022-01-12 19:45 张同光 阅读(334) 评论(0) 推荐(0) 编辑
Can I monitor Linux socket buffer fullness? is it sufficiently "real-time"?
摘要：https://stackoverflow.com/questions/12048116/can-i-monitor-linux-socket-buffer-fullness I work in support for a tech company. I'm trying to troublesho 阅读全文
posted @ 2021-12-28 19:14 张同光 阅读(70) 评论(0) 推荐(0) 编辑
How to query tcp buffer sizes for a certain socket?
摘要：https://access.redhat.com/discussions/3624151 The -m switch of ss gives socket memory info.# ss -ntmpState Recv-Q Send-Q Local Address:Port Peer Addre 阅读全文
posted @ 2021-12-28 18:56 张同光 阅读(159) 评论(0) 推荐(0) 编辑
CONFIG_NET_SCH_NETEM: to emulate network delay, loss, and packet re-ordering.
摘要：CONFIG_NET_SCH_NETEM: Say Y if you want to emulate network delay, loss, and packet re-ordering. This is often useful to simulate networks when testing 阅读全文
posted @ 2021-03-05 09:24 张同光 阅读(343) 评论(0) 推荐(0) 编辑
Tuning initcwnd for optimum performance
摘要：https://www.cdnplanet.com/blog/tune-tcp-initcwnd-for-optimum-performance/#change-initcwnd Tuning the initial congestion window parameter (initcwnd) on 阅读全文
posted @ 2021-03-04 14:18 张同光 阅读(158) 评论(0) 推荐(0) 编辑
the socket buffer size of linux
摘要：# Most versions of UNIX have a very low default buffer limit, which should be increased to at least 2MB. Also, note that UDP recommendations are only 阅读全文
posted @ 2021-03-04 11:36 张同光 阅读(590) 评论(0) 推荐(0) 编辑
HOW TO CHANGE LINUX KERNEL DMESG BUFFER SIZE
摘要：https://rajanvaja.wordpress.com/2015/06/04/how-to-change-linux-kernel-dmesg-buffer-size/ Printk is implemented by using a ring buffer in the kernel wi 阅读全文
posted @ 2021-02-20 10:07 张同光 阅读(265) 评论(0) 推荐(0) 编辑
Tcpprobe 在网络中的使用 --- tcp_probe has been removed from the kernel. --- Using ip-tcp_metrics --- Using ss (socket statistics)
摘要：https://elixir.bootlin.com/linux/v4.0/source/net/ipv4/tcp_probe.c https://askubuntu.com/questions/1164562/tcp-probe-could-not-insert-tcp-probe/1164634 阅读全文
posted @ 2021-02-13 21:55 张同光 阅读(804) 评论(1) 推荐(0) 编辑
(OK) MPTCP协议---Android手机通过 WIFI 和 4G 两条路径同时传输视频数据
摘要：经过连续数月的日日夜夜，终于解决了MPTCP协议在Android移动端难以大规模应用的技术难题。下图中，Android手机通过 WIFI 和 4G 两条路径同时传输视频数据。然而，目前的Android手机要么通过 WIFI 传输数据，要么通过 4G 传输数据，不能够同时使用两条路径。 刷机包：lin 阅读全文
posted @ 2020-11-13 11:28 张同光 阅读(1732) 评论(0) 推荐(0) 编辑
[ztg@localhost lineage-17.1---dipper]$ brunch dipper --- error --- lineage-17.1-20201027-UNOFFICIAL-dipper---no-MPTCP.zip
摘要：6,2,0,-;Boot CPU: AArch64 Processor [517f803c]6,3,0,-;Powerup reason=0x401806,4,0,-;Machine: Xiaomi Technologies, Inc. Dipper new MP v2.16,5,0,-;Reser 阅读全文
posted @ 2020-10-27 18:59 张同光 阅读(1356) 评论(0) 推荐(0) 编辑
[ztg@localhost lineage-17.1---dipper]$ brunch dipper --- error --- lineage-17.1-20201012-UNOFFICIAL-dipper---no-MPTCP.zip
摘要：6,2,0,-;Boot CPU: AArch64 Processor [517f803c]6,3,0,-;Powerup reason=0x401806,4,0,-;Machine: Xiaomi Technologies, Inc. Dipper new MP v2.16,5,0,-;Reser 阅读全文
posted @ 2020-10-27 18:11 张同光 阅读(1443) 评论(0) 推荐(0) 编辑
brunch dipper --- error
摘要：6,86261,128062630,-;MPTCP - /mnt/android/lineage-17.1 dipper/kernel/xiaomi/sdm845/net/mptcp/mptcp_input.c: 2473: mptcp_handle_options6,86262,128062636 阅读全文
posted @ 2020-10-24 23:51 张同光 阅读(319) 评论(0) 推荐(0) 编辑
[ztg@localhost lineage-17.1---dipper]$ brunch dipper --- error
摘要：6,5,0,-;Reserved memory: created CMA memory pool at 0x00000000fa000000, size 92 MiB6,6,0,-;OF: reserved mem: initialized node secure_display_region, c 阅读全文
posted @ 2020-10-19 01:59 张同光 阅读(948) 评论(0) 推荐(0) 编辑
[ztg@localhost lineage-17.1---dipper]$ brunch dipper --- error
摘要：6,64114,98483615,-;MPTCP - /mnt/android/lineage-17.1 dipper/kernel/xiaomi/sdm845/net/mptcp/mptcp_input.c: 1593: mptcp_process_data_ack6,64115,98483617 阅读全文
posted @ 2020-10-17 00:45 张同光 阅读(253) 评论(0) 推荐(0) 编辑
[ztg@localhost lineage-17.1---dipper]$ brunch dipper --- error
摘要：6,0,0,-;Booting Linux on physical CPU 0x05,1,0,-;Linux version 4.9.232-perf-gf69c1100e2ce-dirty (nobody@android-build) (Android (6052599 based on r353 阅读全文
posted @ 2020-10-16 10:23 张同光 阅读(248) 评论(0) 推荐(0) 编辑

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