Its a full-duplex. Its a download-service with 3000 downloaders all over the world.
So actually it's really mostly one-way traffic, ie in the download direction.
Anything significant at all going upstream, other than ACKs, etc?
Not much. See on the graph. The red is the downstream ;)
Yes. send-buffer to 64 kbytes and receive buffer to 16 kbytes.
With regard to this note in the 'man 7 socket' man page:
NOTES
Linux assumes that half of the send/receive buffer is used for internal kernel struc-
tures; thus the sysctls are twice what can be observed on the wire.
What value are you using for the sockopt call?
First I used 64 * 1024 but some months ago I checked with getsockopt and realized that it always gives twice of the value back. So I just have done 64 * 512 ;)
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