2014-06-05 09:35:31 +00:00
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# Configuration
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## Configuration file
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2014-06-25 13:08:33 +00:00
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Take a look in the 'Examples' section for some configurations.
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## Tuning
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### Operating System and Kernel
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For minimum latency several kernel and driver settings can be optimized.
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A [RT-preemp patched Linux](https://rt.wiki.kernel.org/index.php/Main_Page) kernel is recommended.
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Precompiled kernels for Fedora can be found here: http://ccrma.stanford.edu/planetccrma/software/
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- Map NIC IRQs => see setting `affinity`
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- Map Tasks => see setting `affinity`
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- Kernel command line: isolcpus=[cpu_number]
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- Nice Task => see setting `priority`
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- Increase socket priority
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- Configure NIC interrupt coalescence with `ethtool`:
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ethtool -C|--coalesce devname [adaptive-rx on|off] [adaptive-tx on|off] ...
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- Configure NIC kernel driver in `/etc/modprobe.d/e1000e.conf`:
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# More conservative interrupt throttling for better latency
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# https://www.kernel.org/doc/Documentation/networking/e1000e.txt
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option e1000e InterruptThrottleRate=
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### Hardware
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This are some proposals for the selection of appropriate server hardware:
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- Server-grade CPU: Intel Xeon
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- A multi-core systems allows parallization of send/receive paths.
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- Server-grade network cards: Intel PRO/1000
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- These allow offloading of UDP checksumming to the hardware
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\example etc/loopback.conf
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\example etc/example.conf
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