Bobby Eshleman b27a8560ee net: devmem: allow rx-page-size > PAGE_SIZE per dmabuf binding ... Every devmem dmabuf binding today hands the page_pool PAGE_SIZE niovs. This caps a single RX descriptor at PAGE_SIZE, burning CPU on buffer churn for large flows. Add a bind-time netlink attribute, NETDEV_A_DMABUF_RX_PAGE_SIZE, that lets userspace request a larger niov size. The value must be a power of two >= PAGE_SIZE. The TX path is changed to always pass PAGE_SIZE. Measurements: Setup: kperf in devmem RX/TX cuda mode, 4 flows, 64 MB messages, 60s, dctcp, num-rx-queues=4, dmabuf-rx/tx-size-mb=2048, 10 runs per niov size, mlx5. CPU Util: niov net sirq % net idle % app sys % app idle % ----- ---------------- ---------------- ---------------- ---------------- 4K 62.38 +/- 8.27 33.40 +/- 7.51 54.15 +/- 10.23 43.67 +/- 10.53 16K 58.91 +/- 5.35 35.23 +/- 5.88 41.05 +/- 8.87 56.42 +/- 9.24 32K 64.12 +/- 0.68 31.09 +/- 1.48 44.54 +/- 3.51 52.63 +/- 3.65 64K 54.69 +/- 5.54 39.67 +/- 5.81 35.47 +/- 3.11 61.97 +/- 3.27 RX app sys % drops ~19% from 4K to 64K. Throughput: niov RX dev Gbps RX flow avg Gbps ----- ---------------- ----------------- 4K 300.63 +/- 53.21 75.16 +/- 13.30 16K 321.35 +/- 28.20 80.34 +/- 7.05 32K 347.63 +/- 2.20 86.91 +/- 0.55 64K 332.11 +/- 14.26 83.03 +/- 3.56 Throughput seems to increase, but the stdev is pretty wide so could just be noise. kperf support (not yet merged): 8837577f92 Acked-by: Stanislav Fomichev <sdf@fomichev.me> Reviewed-by: Mina Almasry <almasrymina@google.com> Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org> Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com> Link: https://patch.msgid.link/20260805-tcpdm-large-niovs-v8-1-3e0225e2808c@meta.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2026-08-07 18:32:39 -07:00
..
acpi	ACPI: CPPC: Check all controls for fast switching	2026-07-22 15:09:14 +02:00
asm-generic	mm.git review status for mm-hotfixes-stable..mm-nonmm-stable	2026-06-21 13:20:19 -07:00
clocksource
crypto	Networking changes for 7.2.	2026-06-17 08:17:00 +01:00
cxl	cxl: Support dpa without a mailbox	2026-06-29 10:55:47 -07:00
drm	drm-misc-fixes for v7.2-rc5:	2026-07-24 18:30:29 +10:00
dt-bindings	SoC fixes for 7.2	2026-07-17 08:52:09 -07:00
hyperv	mshv: fix hv_input_get_system_property struct	2026-07-22 21:58:21 +00:00
keys	keys: Pin request_key_auth payload in instantiate paths	2026-06-15 15:19:13 +03:00
kunit	linux_kselftest-kunit-7.2-rc1	2026-06-16 16:33:57 +05:30
kvm	KVM: arm64: vgic: Fix race between LPI release and re-registration	2026-07-23 09:56:57 +01:00
linux	ptr_ring: move free-space check into separate helper	2026-08-07 17:29:16 -07:00
math-emu
media	media: v4l2-fwnode: Fix subdev owner overwritten in v4l2_async_register_subdev_sensor()	2026-06-05 10:28:03 +03:00
memory
misc
net	net: mana: Extend RX CQE coalescing up to 8 packets	2026-08-07 18:29:21 -07:00
pcmcia	Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (headers)	2026-07-03 07:38:16 +02:00
ras
rdma	RDMA v7.2 merge window	2026-06-18 08:16:21 -07:00
rv	rv: Prevent task migration while handling per-CPU events	2026-06-03 12:33:25 +02:00
scsi	SCSI fixes on 20260802	2026-08-02 09:32:07 -07:00
soc	soc/tegra: pmc: Fixes for v7.2	2026-07-10 14:40:52 +02:00
sound	ASoC: SDCA: Move kcontrol search out of IRQ	2026-07-27 18:47:09 +01:00
target
trace	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2026-07-23 14:07:40 -07:00
uapi	net: devmem: allow rx-page-size > PAGE_SIZE per dmabuf binding	2026-08-07 18:32:39 -07:00
ufs	Merge branch 7.1/scsi-fixes into 7.2/scsi-staging	2026-06-15 21:01:30 -04:00
vdso	futex: Provide infrastructure to plug the non contended robust futex unlock race	2026-06-03 11:38:52 +02:00
video
xen	xen: Replace __ASSEMBLY__ with __ASSEMBLER__ in header files	2026-07-01 09:49:52 +02:00
Kbuild