Hi Ben, Lukas, > We need someone to be able to test this, are you aware what nics currently > support busy polling? What about loopback?
According to this Intel doc [1], it requires an Intel X520 or X540, with the ixgbe driver. > As for the docs, I think we should at least mention that: > - only certain nic drivers support busy polling > - it will increases power usage > - while busy_read sysctl is overwritten by the SO_BUSY_POLL socket option, > busy_poll must be set at sysctl level [1] Do you happen to know if busy polling work with epoll() ? I stumbled upon this patch [2] but it does not seem to be included in recent kernels. [1]: http://www.intel.fr/content/dam/www/public/us/en/documents/white-papers/open-source-kernel-enhancements-paper.pdf [2]: https://lkml.org/lkml/2013/8/21/192 -- Rémi
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