Amir Vadai recently sent me some patches for netperf to implement
setting SO_PRIORITY. I made changes to netperf based on those patches,
(now in top of trunk on netperf.org) and between some emails with me,
him and Dave Taht and some quick messing around while watching tcpdump,
I'm wondering if this:
SO_PRIORITY
Set the protocol-defined priority for all packets to be sent on
this socket. Linux uses this value to order the networking
queues: packets with a higher priority may be processed first
depending on the selected device queueing discipline. For
ip(7), this also sets the IP type-of-service (TOS) field for
outgoing packets. Setting a priority outside the range 0 to 6
requires the CAP_NET_ADMIN capability.
from the socket(7) manpage is still accurate because even setting a
number of different values for SO_PRIORITY I didn't see the TOS field as
anything other than 0 in tcpdump output (confirming something Dave Taht
saw).
happy benchmarking,
rick jones
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