677a51790b
Pavel Begunkov says: ==================== Add support for providers with large rx buffer Many modern NICs support configurable receive buffer lengths, and zcrx and memory providers can use buffers larger than 4K to improve performance. When paired with hw-gro larger rx buffer sizes can drastically reduce the number of buffers traversing the stack and save a lot of processing time. It also allows to give to users larger contiguous chunks of data. Single stream benchmarks showed up to ~30% CPU util improvement. E.g. comparison for 4K vs 32K buffers using a 200Gbit NIC: packets=23987040 (MB=2745098), rps=199559 (MB/s=22837) CPU %usr %nice %sys %iowait %irq %soft %idle 0 1.53 0.00 27.78 2.72 1.31 66.45 0.22 packets=24078368 (MB=2755550), rps=200319 (MB/s=22924) CPU %usr %nice %sys %iowait %irq %soft %idle 0 0.69 0.00 8.26 31.65 1.83 57.00 0.57 This series adds net infrastructure for memory providers configuring the size and implements it for bnxt. It's an opt-in feature for drivers, they should advertise support for the parameter in the qops and must check if the hardware supports the given size. It's limited to memory providers as it drastically simplifies implementation. It doesn't affect the fast path zcrx uAPI, and the user exposed parameter is defined in zcrx terms, which allows it to be flexible and adjusted in the future. A liburing example can be found at [2] full branch: [1] https://github.com/isilence/linux.git zcrx/large-buffers-v8 Liburing example: [2] https://github.com/isilence/liburing.git zcrx/rx-buf-len * tag 'net-queue-rx-buf-len-v9' of https://github.com/isilence/linux: io_uring/zcrx: document area chunking parameter selftests: iou-zcrx: test large chunk sizes eth: bnxt: support qcfg provided rx page size eth: bnxt: adjust the fill level of agg queues with larger buffers eth: bnxt: store rx buffer size per queue net: pass queue rx page size from memory provider net: add bare bone queue configs net: reduce indent of struct netdev_queue_mgmt_ops members net: memzero mp params when closing a queue ==================== Link: https://patch.msgid.link/ Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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