On Thu, 13 Aug 2015 03:13:40 +0200 Phil Sutter <p...@nwl.cc> wrote: > On Tue, Aug 11, 2015 at 06:13:49PM -0700, Alexei Starovoitov wrote:
> > In general 'changing the default' may be an acceptable thing, but then > > it needs to strongly justified. How much performance does it bring? > > A quick test on my local VM with veth and netperf (netserver and veth > peer in different netns) I see an increase of about 5% of throughput > when using noqueue instead of the default pfifo_fast. Good that you can show 5% improvement with a single netperf flow. We are saving approx 6 atomic operations avoiding the qdisc code path. This fixes a scalability issue with veth. Thus, the real performance boost will happen with multiple flows and multiple CPU cores in action. You can try with a multi core VM and use super_netperf. https://github.com/borkmann/stuff/blob/master/super_netperf -- Best regards, Jesper Dangaard Brouer MSc.CS, Sr. Network Kernel Developer at Red Hat Author of http://www.iptv-analyzer.org LinkedIn: http://www.linkedin.com/in/brouer -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
