deprecate warning about stt (#326)

* deprecate warning about stt

Signed-off-by: Mengxin Liu <[email protected]>

* Update docs/advance/performance-tuning.en.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Update docs/advance/performance-tuning.en.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

---------

Signed-off-by: Mengxin Liu <[email protected]>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
(cherry picked from commit 5b0ed95)

Author: oilbeater

docs/advance/performance-tuning.en.md

@@ -7,7 +7,7 @@ The community will continue to iterate on the performance.
 Some general performance optimizations have been integrated into the latest version,
 so it is recommended to use the latest version to get better default performance.
 
-For more on the process and methodology of performance optimization, please watch the video [Kube-OVN 容器性能优化之旅](https://www.bilibili.com/video/BV1zS4y1T73m?share_source=copy_web).
+For more on the process and methodology of performance optimization, please watch the video [Kube-OVN 容器性能优化之旅](https://www.bilibili.com/video/BV1zS4y1T73m?share_source=copy_web){: target="_blank" }.
 
 ## Benchmarking
 
@@ -119,7 +119,7 @@ ethtool -G eno1 tx 4096
 
 ### Optimize with tuned
 
-[tuned](https://tuned-project.org/) can use a series of preconfigured profile files to perform system optimizations for a specific scenario.
+[tuned](https://tuned-project.org/){: target="_blank" } can use a series of preconfigured profile files to perform system optimizations for a specific scenario.
 
 For latency-first scenarios:
 
@@ -208,7 +208,7 @@ yum install -y gcc kernel-devel-$(uname -r) python3 autoconf automake libtool rp
 Compile the OVS kernel module and generate the corresponding RPM:
 
 ```bash
-git clone -b branch-2.17 --depth=1 https://github.com/openvswitch/ovs.git
+git clone -b branch-3.5 --depth=1 https://github.com/openvswitch/ovs.git
 cd ovs
 curl -s  https://github.com/kubeovn/ovs/commit/2d2c83c26d4217446918f39d5cd5838e9ac27b32.patch |  git apply
 ./boot.sh
@@ -220,7 +220,7 @@ cd rpm/rpmbuild/RPMS/x86_64/
 Copy the RPM to each node and install:
 
 ```bash
-rpm -i openvswitch-kmod-2.15.2-1.el7.x86_64.rpm
+rpm -i openvswitch-kmod-3.5.1-1.el7.x86_64.rpm
 ```
 
 If you have previously started Kube-OVN and the older version of the OVS module has been loaded into the kernel.
@@ -237,7 +237,7 @@ apt install -y autoconf automake libtool gcc build-essential libssl-dev
 Compile the OVS kernel module and install:
 
 ```bash
-git clone -b branch-2.17 --depth=1 https://github.com/openvswitch/ovs.git
+git clone -b branch-3.5 --depth=1 https://github.com/openvswitch/ovs.git
 cd ovs
 curl -s  https://github.com/kubeovn/ovs/commit/2d2c83c26d4217446918f39d5cd5838e9ac27b32.patch |  git apply
 ./boot.sh
@@ -261,6 +261,10 @@ It is recommended to reboot the machine to reload the new version of the kernel
 
 ### Using STT Type Tunnel
 
+!!! warning
+
+    Open vSwitch upstream removed support for STT tunnels in version 3.6 [commit](https://github.com/openvswitch/ovs/commit/19b89416203f3b3b212fb01c30c81ea1b77624eb){: target="_blank" }. This solution will no longer receive upstream support in the future.
+
 Common tunnel encapsulation protocols such as Geneve and Vxlan use the UDP protocol to encapsulate packets and are well supported in the kernel.
 However, when TCP packets are encapsulated using UDP, the optimization and offload features of modern operating systems and
 network cards for the TCP protocol do not work well, resulting in a significant drop in TCP throughput.

docs/advance/performance-tuning.md

@@ -5,7 +5,7 @@
 
 社区会不断迭代控制面板和优化面的性能，部分通用性能优化已经集成到最新版本，建议使用最新版本获得更好的默认性能。
 
-更多关于性能优化的过程和方法论，可以观看视频分享：[Kube-OVN 容器性能优化之旅](https://www.bilibili.com/video/BV1zS4y1T73m?share_source=copy_web)。
+更多关于性能优化的过程和方法论，可以观看视频分享：[Kube-OVN 容器性能优化之旅](https://www.bilibili.com/video/BV1zS4y1T73m?share_source=copy_web){: target="_blank" }。
 
 ## 基准测试
 
@@ -113,7 +113,7 @@ ethtool -G eno1 tx 4096
 
 ### 使用 tuned 优化系统参数
 
-[tuned](https://tuned-project.org/) 可以使用一系列预置的 profile 文件保存了针对特定场景的一系列系统优化配置。
+[tuned](https://tuned-project.org/){: target="_blank" } 可以使用一系列预置的 profile 文件保存了针对特定场景的一系列系统优化配置。
 
 针对延迟优先场景：
 
@@ -195,7 +195,7 @@ yum install -y gcc kernel-devel-$(uname -r) python3 autoconf automake libtool rp
 编译 OVS 内核模块并生成对应 RPM 文件:
 
 ```bash
-git clone -b branch-2.17 --depth=1 https://github.com/openvswitch/ovs.git
+git clone -b branch-3.5 --depth=1 https://github.com/openvswitch/ovs.git
 cd ovs
 curl -s  https://github.com/kubeovn/ovs/commit/2d2c83c26d4217446918f39d5cd5838e9ac27b32.patch |  git apply
 ./boot.sh
@@ -207,7 +207,7 @@ cd rpm/rpmbuild/RPMS/x86_64/
 复制 RPM 到每个节点并进行安装：
 
 ```bash
-rpm -i openvswitch-kmod-2.15.2-1.el7.x86_64.rpm
+rpm -i openvswitch-kmod-3.5.1-1.el7.x86_64.rpm
 ```
 
 若之前已经启动过 Kube-OVN，旧版本 OVS 模块已加载至内核，建议重启机器重新加载新版内核模块。
@@ -225,7 +225,7 @@ apt install -y autoconf automake libtool gcc build-essential libssl-dev
 ```bash
 apt install -y autoconf automake libtool gcc build-essential libssl-dev
 
-git clone -b branch-2.17 --depth=1 https://github.com/openvswitch/ovs.git
+git clone -b branch-3.5 --depth=1 https://github.com/openvswitch/ovs.git
 cd ovs
 curl -s  https://github.com/kubeovn/ovs/commit/2d2c83c26d4217446918f39d5cd5838e9ac27b32.patch |  git apply
 ./boot.sh
@@ -248,6 +248,10 @@ cp debian/openvswitch-switch.init /etc/init.d/openvswitch-switch
 
 ### 使用 STT 类型隧道
 
+!!! warning
+
+    OpenVswitch 上游在 3.6 版本[移除对 STT 类型 Tunnel 的支持](https://github.com/openvswitch/ovs/commit/19b89416203f3b3b212fb01c30c81ea1b77624eb){: target="_blank" }，该方案未来将无法得到上游支持。
+
 常见的隧道封装协议例如 Geneve 和 Vxlan 使用 UDP 协议对数据包进行封装，在内核中有良好的支持。但是当使用 UDP 封装 TCP 数据包时，
 现代操作系统和网卡针对 TCP 协议的优化和 offload 功能将无法顺利工作，导致 TCP 的吞吐量出现显著下降。在虚拟化场景下由于 CPU 的限制，
 TCP 大包的吞吐量甚至可能只有宿主机网络的十分之一。