On 05/23, Tariq Toukan wrote: > This series from the team adds support for zerocopy rx TCP with devmem > and io_uring for ConnectX7 NICs and above. For performance reasons and > simplicity HW-GRO will also be turned on when header-data split mode is > on. > > Find more details below. > > Regards, > Tariq > > Performance > =========== > > Test setup: > > * CPU: Intel(R) Xeon(R) Platinum 8380 CPU @ 2.30GHz (single NUMA) > * NIC: ConnectX7 > * Benchmarking tool: kperf [1] > * Single TCP flow > * Test duration: 60s > > With application thread and interrupts pinned to the *same* core: > > |------+-----------+----------| > | MTU | epoll | io_uring | > |------+-----------+----------| > | 1500 | 61.6 Gbps | 114 Gbps | > | 4096 | 69.3 Gbps | 151 Gbps | > | 9000 | 67.8 Gbps | 187 Gbps | > |------+-----------+----------| > > The CPU usage for io_uring is 95%. > > Reproduction steps for io_uring: > > server --no-daemon -a 2001:db8::1 --no-memcmp --iou --iou_sendzc \ > --iou_zcrx --iou_dev_name eth2 --iou_zcrx_queue_id 2 > > server --no-daemon -a 2001:db8::2 --no-memcmp --iou --iou_sendzc > > client --src 2001:db8::2 --dst 2001:db8::1 \ > --msg-zerocopy -t 60 --cpu-min=2 --cpu-max=2 > > Patch overview: > ================ > > First, a netmem API for skb_can_coalesce is added to the core to be able > to do skb fragment coalescing on netmems. > > The next patches introduce some cleanups in the internal SHAMPO code and > improvements to hw gro capability checks in FW. > > A separate page_pool is introduced for headers. Ethtool stats are added > as well. > > Then the driver is converted to use the netmem API and to allow support > for unreadable netmem page pool. > > The queue management ops are implemented. > > Finally, the tcp-data-split ring parameter is exposed. > > Changelog > ========= > > Changes from v1 [0]: > - Added support for skb_can_coalesce_netmem(). > - Avoid netmem_to_page() casts in the driver. > - Fixed code to abide 80 char limit with some exceptions to avoid > code churn. Since there is gonna be 2-3 weeks of closed net-next, can you also add a patch for the tx side? It should be trivial (skip dma unmap for niovs in tx completions plus netdev->netmem_tx=1). And, btw, what about the issue that Cosmin raised in [0]? Is it addressed in this series? 0: https://lore.kernel.org/netdev/9322c3c4826ed1072ddc9a2103cc641060665864.camel@xxxxxxxxxx/
