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linux/net/vmw_vsock
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Will Deacon 680c7d9d91 vsock/virtio: Resize receive buffers so that each SKB fits in a 4K page 
[ Upstream commit 03a92f036a ]

When allocating receive buffers for the vsock virtio RX virtqueue, an
SKB is allocated with a 4140 data payload (the 44-byte packet header +
VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE). Even when factoring in the SKB
overhead, the resulting 8KiB allocation thanks to the rounding in
kmalloc_reserve() is wasteful (~3700 unusable bytes) and results in a
higher-order page allocation on systems with 4KiB pages just for the
sake of a few hundred bytes of packet data.

Limit the vsock virtio RX buffers to 4KiB per SKB, resulting in much
better memory utilisation and removing the need to allocate higher-order
pages entirely.

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Will Deacon <will@kernel.org>
Message-Id: <20250717090116.11987-5-will@kernel.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-08-20 18:30:40 +02:00
..
af_vsock.c vsock: Do not allow binding to VMADDR_PORT_ANY 2025-08-15 12:14:09 +02:00
af_vsock_tap.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
diag.c sock_diag: add module pointer to "struct sock_diag_handler" 2024-01-23 15:13:54 +01:00
hyperv_transport.c hv_sock: Initializing vsk->trans to NULL to prevent a dangling pointer 2024-11-22 15:30:25 +01:00
Kconfig vsock: add vsock_loopback transport 2019-12-11 15:01:23 -08:00
Makefile vsock: support sockmap 2023-03-29 08:19:38 +01:00
virtio_transport.c vsock/virtio: Resize receive buffers so that each SKB fits in a 4K page 2025-08-20 18:30:40 +02:00
virtio_transport_common.c vsock/virtio: fix rx_bytes accounting for stream sockets 2025-06-19 15:31:54 +02:00
vmci_transport.c vsock/vmci: Clear the vmci transport packet properly when initializing it 2025-07-10 16:04:41 +02:00
vmci_transport.h vsock: Remove unused function declarations 2023-07-31 14:41:08 -07:00
vmci_transport_notify.c vmci/vsock: check SO_RCVLOWAT before wake up reader 2022-08-23 10:43:12 +02:00
vmci_transport_notify.h vsock: remove include/linux/vm_sockets.h file 2019-11-14 18:12:17 -08:00
vmci_transport_notify_qstate.c vmci/vsock: check SO_RCVLOWAT before wake up reader 2022-08-23 10:43:12 +02:00
vsock_addr.c vsock_addr: Check for supported flag values 2020-12-14 19:33:39 -08:00
vsock_bpf.c vsock/bpf: Warn on socket without transport 2025-02-27 04:30:17 -08:00
vsock_loopback.c vsock/virtio: add SIOCOUTQ support for all virtio based transports 2024-08-02 09:20:28 +01:00