Re: [RFC net-next PATCH V1 0/9] net: fragmentation performance scalability on NUMA/SMP systems
From: Jesper Dangaard Brouer <hidden>
Date: 2012-11-26 14:45:15
On Sun, 2012-11-25 at 08:11 -0800, Eric Dumazet wrote:
On Sun, 2012-11-25 at 09:53 +0100, Jesper Dangaard Brouer wrote:quoted
Yes, for the default large 64k packets size, its just a "fake" benchmark. And notice with my fixes, we are even faster than the none-frag/single-UDP packet case... but its because we are getting a GSO/GRO effect.Could you elaborate on this GSO/GRO effect ?
On the big system, I saw none-frag UDP (1472 bytes) throughput of: 7356.57 + 7351.78 + 7330.60 + 7269.26 = 29308.21 Mbit/s While with UDP fragments size 65507 bytes I saw: 9228.75 + 9207.81 + 9615.83 + 9615.87 = 37668.26 Mbit/s Fragmented UDP is faster by: 37668.26 - 29308.21 = 8360.05 Mbit/s The 65507 bytes UDP size is just a benchmark test, and have no real-life relevance. As performance starts to drop (below none-frag/normal case) when the frag size is decreased, to more realistic sizes... -- 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