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by robertgraham
4187 days ago
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The Linux TCP stack is NOT fast. My DNS server can respond to DNS queries faster than the simplest of in-kernel echo servers (like ICMP ping or UDP port 7 echo). That's with the entire DNS overhead of parsing the DNS protocol, looking up the name in a very large database (like the .com zone), doing compression, and generating a response. The upshot is this: going through the Linux stack, a DNS server is limited to around 2 million queries/second. Using a custom user-mode stack, it can achieve 10 million queries per second. |
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