Improving WLAN Performance through Segmentation Techniques
Explore how segmentation of data packets in WLAN systems can enhance performance by reducing CPU utilization, saving power, and increasing throughput efficiency. Discover the benefits of Maximum Segmented MSDU Exponent and MPDU/MSDU Modulo size assignments in optimizing data transmission in IEEE 802.11 standards.
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Sep2017 doc.: IEEE 802.11-17-1471r1 EDMG Segmentation and Reassembly Authors: Name Oren Kedem Affiliations Intel Address Phone email oren.kedem@intel.com Submission Slide 1 Oren Kedem Intel
doc.: IEEE 802.11-17-1471r1 Motivation for Segmentation 11ad Max MSDU size is 7920B. MSDU size limits the size of the MTU ( Maximum Transmit Unit ) that is reported to upper layer in WLAN systems Hence, any application that utilizes bigger datagrams is required to segment its datagrams between originator and consumer. Segmentation done by the upper layer involved with: Adding new L3/L4 header, Calculating new checksum Significant CPU utilization resource allocated for handling the high number of datagram segments Enabling higher MTUs to upper layer will improve the following: CPU cost saving Power consumption TPT and Efficiency Submission Oren Kedem (Intel)
doc.: IEEE 802.11-17-1471r1 Segmentation improvement In order to evaluate the expected improvement in CPU Utilization the below test was conducted: Ethernet network adapter was operated with and without LSO. Implications of LSO feature are similar to those of segmentation in terms of CPU frame processing. Test results showed that offloading LSO from upper layer yield performance improvement of ~15-30% in CPU utilization. Differences might be expected with relation to 11ay expected improvement as result of the differences in MPDU size and frame processing tasks that the adaptor is required to perform. 3 Submission Oren Kedem (Intel)
doc.: IEEE 802.11-17-1471r1 MSDU Size vs. MPDU/MSDU Modulo size Value Assignment Examples Maximum Segmented MSDU Exponent 13+0 13+1 13+2 13+3 13+4 13+5 13+6 13+7 13+8 13+9 Number of MPDUs required for one MSDU 2 3 5 9 17 34 67 133 265 530 MAX MSDU Size (Bytes) 8192 16384 32768 65536 131072 262144 524288 1048576 2097152 4194304 MPDU Modulo size MSDU Modulo size MPDU Wrap around Maximum MSDU Size supported 6 262144 524288 8 7 6 5 4 3 2 64 128 256 512 1024 2048 4096 7 8 9 1048576 2097152 4194304 4194304 4194304 10 11 12 Submission 4 Oren Kedem (Intel)
June 2017 doc.: IEEE 802.11-17-1471r1 BACKUP Submission Slide 5 Kedem Oren, Intel et al
