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<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="16.877563" y="8">chunk hdr</tspan>
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<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="20.771148" y="8">sample chain</tspan>
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<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="34.56558" y="8">rdata</tspan>
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<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="8">A receive thread has a pool of receive buffers, </tspan>
<tspan font-family="Gill Sans" font-size="9" font-style="italic" font-weight="400" fill="black" y="8">rbuf</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" y="8">s, each </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="18">large enough to contain several network packets and derived </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="28">administrative data.</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="38">Before requesting a packet from the kernel, a receive thread </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="48">allocates an </tspan>
<tspan font-family="Gill Sans" font-size="9" font-style="italic" font-weight="400" fill="black" y="48">rmsg</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" y="48"> from the buffer, which is the administrative </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="58">entity representing a raw packet along with additional </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="68">derived data.</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="78">During processing the packet, an </tspan>
<tspan font-family="Gill Sans" font-size="9" font-style="italic" font-weight="400" fill="black" y="78">rdata</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" y="78"> is created for each </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="88">Data/DataFrag submessage. These </tspan>
<tspan font-family="Gill Sans" font-size="9" font-style="italic" font-weight="400" fill="black" y="88">rdata</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" y="88"> entries contain a </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="98">reference to the </tspan>
<tspan font-family="Gill Sans" font-size="9" font-style="italic" font-weight="400" fill="black" y="98">rmsg</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" y="98"> and a byte range within the packet at </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="108">which the serialized payload is stored.</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="118">For each sample (i.e., sequence number), a </tspan>
<tspan font-family="Gill Sans" font-size="9" font-style="italic" font-weight="400" fill="black" y="118">sampleinfo</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" y="118"> </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="128">containing various metadata on the sample is allocated. The </tspan>
<tspan font-family="Gill Sans" font-size="9" font-style="italic" font-weight="400" fill="black" x="0" y="138">sampleinfo</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" y="138"> includes a reference to the receiver state as </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="148">described in the DDSI specification, which contains, a.o., time </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="158">stamps and source addresses.</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="168">For fragmented data, </tspan>
<tspan font-family="Gill Sans" font-size="9" font-style="italic" font-weight="400" fill="black" y="168">rdata</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" y="168"> are chained together into a </tspan>
<tspan font-family="Gill Sans" font-size="9" font-style="italic" font-weight="400" fill="black" x="0" y="178">fragchain</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" y="178">, using interval tree pointed to by a </tspan>
<tspan font-family="Gill Sans" font-size="9" font-style="italic" font-weight="400" fill="black" y="178">sample.defrag</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" y="178">.</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="188">Completed samples that have been received out of order are </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="198">linked into chains of consecutive samples, with the sample </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="208">chains organized into an interval tree using </tspan>
<tspan font-family="Gill Sans" font-size="9" font-style="italic" font-weight="400" fill="black" y="208">sample.reorder</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" y="208">.</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="218">Once a sample has been delivered, the reference count of the </tspan>
<tspan font-family="Gill Sans" font-size="9" font-style="italic" font-weight="400" fill="black" x="0" y="228">rmsg</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" y="228">s pointed to by its fragchain are decremented, eventually </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="238">freeing the original network packets and recovering space in </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="248">the </tspan>
<tspan font-family="Gill Sans" font-size="9" font-style="italic" font-weight="400" fill="black" y="248">rbuf</tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" y="248">s.</tspan>
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<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="8">Note: there is no </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="18">conceptual difference </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="28">between light grey </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="38">arrows and black </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="48">arrows: it is merely to </tspan>
<tspan font-family="Gill Sans" font-size="9" font-weight="400" fill="black" x="0" y="58">reduce visual clutter</tspan>
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