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kist: Document a magic value in channel_should_write_to_kernel()

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Closes #40008

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2020-06-22 15:28:47 -04:00
parent 033f804429
commit c55e633f74
1 changed files with 5 additions and 0 deletions
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5
src/core/or/scheduler_kist.c
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@ -445,6 +445,11 @@ update_socket_written(socket_table_t *table, channel_t *chan, size_t bytes)
* one cell for each and bouncing back and forth. This KIST impl avoids that
* by only writing a channel's outbuf to the kernel if it has 8 cells or more
* in it.
*
* Note: The number 8 has been picked for no particular reasons except that it
* is 4096 bytes which is a common number for buffering. A TLS record can hold
* up to 16KiB thus using 8 cells means that a relay will at most send a TLS
* record of 4KiB or 1/4 of the maximum capacity of a TLS record.
*/
MOCK_IMPL(int, channel_should_write_to_kernel,
(outbuf_table_t *table, channel_t *chan))