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docs: Add information about what dpdk_zero_copy is doing

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This adds some info about what is happening in the dpdk_zero_copy
transport, especially the fact that there are threads spun off that take
over CPUs.
This commit is contained in:
Alex Williams 2019-01-29 14:53:07 -08:00 committed by Brent Stapleton
parent 95bdaa00cc
commit da59fe8f35
1 changed files with 9 additions and 2 deletions
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11
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@ -6,8 +6,15 @@
Data Plane Development Kit (DPDK) is a set of libraries that allows network
interface controller (NIC) drivers to use user space memory buffers to send and
receive data over a network. This allows us to eliminate context switching in
UHD's transport layer, which enables us to stream higher sample rates.
receive data over a network. These libraries underpin one of the network
transport options in UHD.
In UHD, the DPDK-based transport will fork off I/O threads that implement the
network services, and these I/O threads will service the NICs on cores provided
in your configuration. The cores will be completely consumed by the I/O thread.
Together with DPDK's polling-mode drivers, this virtually eliminates context
switching in UHD's transport layer, which enables us to stream higher sample
rates.
\section dpdk_setup DPDK Setup