> For the complete documentation index, see [llms.txt](https://applezulab.netdpi.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://applezulab.netdpi.net/02-linux-xi-tong-cao-zuo/tune-linux-server-performance.md). # Linux 伺服器效能調校 **網路效能測試軟體** * Netperf (): 支援 TCP, UDP, DLPI (Data Link Provider Interface), UNIX Domain Sockets. * SPEC SFS () * Volanomark () * Web server: SPECweb, SPECweb SSL, TPC-W, SPECjAPPServer and ECPerf * Oracle: ) * SAP Standard () \ **Linux 網路參數設定**
> echo "30000" > /proc/sys/net/ipv4/tcp\_max\_syn\_backlog\ > 預設為 1024，可增加 Server queue TCP SYN 的數量\ > \ > echo "2000000" > /proc/sys/net/ipv4/tcp\_max\_tw\_buckets\ > 預設為 180000，增加 TIME-WAIT state 的數量\ > \ > echo "50000" > /proc/sys/net/core/netdev\_max\_backlog\ > 設定可以 queue 在IP層之下的 network core 之封包數目，可以使用較多的記憶體儲存進入的封包，預設 1000。
\ 最好用的文件仍然是 Kernel source 中的 Documentation，設定 Kernel 參數可透過 sysctl, procfs\ 範例： > \ > \# sysctl -w kernel.shmmax=32\ > \# sysctl -p /etc/sysctl.conf\ > \ > \# echo "32" > /proc/sys/kernel/shmmax\ > \ > Linux kernel 2.6\ > \ > /proc/sys/kernel/\ > thread-max: 系統中可允許的最大 thread 數目。\ > domainname\ > hostname\ > ostype\ > osrelease\ > version：Kernel version\ > real-root-dev：real root device partition\ > rtsig-max：最大的 real time signals\ > rtsig-nr：現在 queue 中的 real-time signals 數量\ > pid\_max\ > \ > /proc/sys/fs/\ > file-max: file descriptors 的最大數目\ > file-nr: file handles 的個數\ > super-max: 檔案系統的最大數目\ > \ > /proc/sys/net/ipv4/\ > ip\_no\_pmtu\_disc: 關閉 Path MTU discovery\ > \ > /proc/sys/net/route/\ > max\_size: routing cache 的最大 size\ > max\_delay: flushing routing cache 的最大延遲時間\ > \ > /proc/sys/net/conf/interface/\ > proxy\_arp:\ > rp\_filter: 需要驗證來源位址\ > \ > /proc/sys/net/core\ > rmem\_default: socket 的接收 buffer size\ > rmem\_max: socket 的最大接收 buffer size\ > wmem\_default: socket 的傳送 buffer size\ > wmem\_max: socket 的最大傳送 buffer size\ > netdev\_max\_backlog: queued 封包的最大數目\
\ **參考文獻**\ 1\. Sandra K. Johnson, [Performance Tuning for Linux Servers](https://web.archive.org/web/20200306075615/http://www.amazon.com/gp/product/0137136285/ref=as_li_tf_tl?ie=UTF8\&camp=1789\&creative=9325\&creativeASIN=0137136285\&linkCode=as2\&tag=apla0fb9-20), IBM PRESS, 2005.\ 2\. 劉怡芳、劉育銘，[伺服器效能調校專家─以 Linux 為例](https://web.archive.org/web/20200306075615/http://www.books.com.tw/exep/assp.php/vip--af000078707/exep/prod/booksfile.php?item=0010318534)，學貫，2005。 --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://applezulab.netdpi.net/02-linux-xi-tong-cao-zuo/tune-linux-server-performance.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.