On Thu, 13 Jun 2019 18:39:59 +0900 Toshiaki Makita <toshiaki.makita1@xxxxxxxxx> wrote: > XDP_TX is similar to XDP_REDIRECT as it essentially redirects packets to > the device itself. XDP_REDIRECT has bulk transmit mechanism to avoid the > heavy cost of indirect call but it also reduces lock acquisition on the > destination device that needs locks like veth and tun. > > XDP_TX does not use indirect calls but drivers which require locks can > benefit from the bulk transmit for XDP_TX as well. > > This patch introduces bulk transmit mechanism in veth using bulk queue > on stack, and improves XDP_TX performance by about 9%. > > Here are single-core/single-flow XDP_TX test results. CPU consumptions > are taken from "perf report --no-child". > > - Before: > > 7.26 Mpps > > _raw_spin_lock 7.83% > veth_xdp_xmit 12.23% > > - After: > > 7.94 Mpps > > _raw_spin_lock 1.08% > veth_xdp_xmit 6.10% > > v2: > - Use stack for bulk queue instead of a global variable. > > Signed-off-by: Toshiaki Makita <toshiaki.makita1@xxxxxxxxx> > --- > drivers/net/veth.c | 60 +++++++++++++++++++++++++++++++++++++++++++----------- > 1 file changed, 48 insertions(+), 12 deletions(-) Acked-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx> -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer
