Jumbo frames in AMS-IX
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The document discusses implementing jumbo frames on the AMS-IX network. A survey of 115 participants found mixed opinions on changing the existing VLAN or creating a new one. Benefits of jumbo frames include reduced CPU load and network overhead, and improved TCP performance. However, obstacles include lack of standards around payload size, increased delay and buffer requirements, and issues with path MTU discovery. Based on limited feedback, most networks do not currently use jumbo frames with customers. The presentation concludes that more customer feedback is needed before implementing jumbo frames on AMS-IX.
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![Jumbo Frames in AMS-IX version 0.5 Take part in survey: https://www.surveymonkey.com/s/TGS5T2D AMS-IX GM33. Amsterdam 16 November 2011 Maksym Tulyuk [email_address]](https://image.slidesharecdn.com/jumboframes-111117090130-phpapp01/85/Jumbo-frames-in-AMS-IX-1-320.jpg)
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Jumbo frames in AMS-IX
- 1. Jumbo Frames in AMS-IX version 0.5 Take part in survey: https://www.surveymonkey.com/s/TGS5T2D AMS-IX GM33. Amsterdam 16 November 2011 Maksym Tulyuk [email_address]
- 3. 1. AMS-IX survey and possible implementations Jumbo Frames in AMS-IX Maksym Tulyuk [email_address] AMS-IX GM33. Amsterdam 16 November 2011
- 4. AMS-IX survey 115 participants
- 7. AMS-IX survey 115 participants
- 11. 2. Benefits of Jumbo Frames Jumbo Frames in AMS-IX Maksym Tulyuk [email_address] AMS-IX GM33. Amsterdam 16 November 2011
- 12. 2.1. CPU load http:// staff.psc.edu / mathis /MTU/AlteonExtendedFrames_W0601.pdf Alteon Networks. Extended Frame sizes for Next Generations Ethernets
- 13. 2.1. CPU load Dell Inc. Internal Report
- 14. 2.2. Network overhead Theoretical maximum throughout on 1Gbit http://sd.wareonearth.com/~phil/net/overhead/ 9000 bytes TCP: 990.042 Mbps UDP: 992.697 Mbps 1500 bytes TCP: 941.482 Mbps UDP: 957.087 Mbps TCP: +4.8%, UDP: +3.5%
- 15. 2.3. TCP performance http://www2.rad.com/networks/2003/largemtu/tcperf.htm Double MTU size - Double TCP throughout Frame size = 9000 bytes Throughput = 40Mbit/s Frame size = 1500 bytes Throughput = 6.5Mbit/s MSS = MTU – 40 RTT = 40ms Loss = 0.01%
- 17. 3. Obstacles to Jumbo Frames Jumbo Frames in AMS-IX Maksym Tulyuk [email_address] AMS-IX GM33. Amsterdam 16 November 2011
- 21. 3.2. Delay and jitter Double MTU size - Double delay http://www.ethernetalliance.org/files/static_page_files/DCB whitepaper.pdf
- 22. 3.3. Buffer size Double MTU size - Double buffers http://www.ethernetalliance.org/files/static_page_files/DCB whitepaper.pdf Port_Buffers = 2 * MTU + link_delay * link_speed Switch_Buffers = Num_Ports * Num_Queues * Port_Buffer link_delay = 0, Num_Ports = 24 MTU = 1518 Num_Queues = 8 Buffers = 582 912 MTU = 9018 Num_Queues = 8 Buffers = 3 462 912
- 25. 4. Statistics Jumbo Frames in AMS-IX Maksym Tulyuk [email_address] AMS-IX GM33. Amsterdam 16 November 2011
- 26. 4.1. Frame size statistics https://www.ams-ix.net/sflow-stats/size/ Twice more traffic with minimal size that with maximum size
- 28. 5. Summary Jumbo Frames in AMS-IX Maksym Tulyuk [email_address] AMS-IX GM33. Amsterdam 16 November 2011
- 32. Take part in survey: https://www.surveymonkey.com/s/TGS5T2D Jumbo Frames in AMS-IX Comments? Maksym Tulyuk [email_address] AMS-IX GM33. Amsterdam 16 November 2011