pktgen: add flag NO_TIMESTAMP to disable timestamping
authorJesper Dangaard Brouer <brouer@redhat.com>
Thu, 28 Aug 2014 16:14:47 +0000 (18:14 +0200)
committerDavid S. Miller <davem@davemloft.net>
Tue, 2 Sep 2014 01:06:59 +0000 (18:06 -0700)
commitafb84b6261841f8ab387e267e748236fa805bea0
treedeb07ffc7c37287974233be17f49da1a459da757
parent05f8461bf746660ea725f922cfae9af66be1f79f
pktgen: add flag NO_TIMESTAMP to disable timestamping

Then testing the TX limits of the stack, then it is useful to
be-able to disable the do_gettimeofday() timetamping on every packet.

This implements a pktgen flag NO_TIMESTAMP which will disable this
call to do_gettimeofday().

The performance change on (my system E5-2695) with skb_clone=0, goes
from TX 2,423,751 pps to 2,567,165 pps with flag NO_TIMESTAMP. Thus,
the cost of do_gettimeofday() or saving is approx 23 nanosec.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/pktgen.c