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| author | Will Deacon <[email protected]> | 2025-07-17 09:01:16 +0000 |
|---|---|---|
| committer | Michael S. Tsirkin <[email protected]> | 2025-08-01 13:11:09 +0000 |
| commit | 6693731487a8145a9b039bc983d77edc47693855 (patch) | |
| tree | c44caf3ac065084048b962ca92db2a90234fb4c0 /rust/helpers/regulator.c | |
| parent | vsock/virtio: Rename virtio_vsock_skb_rx_put() (diff) | |
| download | kernel-6693731487a8145a9b039bc983d77edc47693855.tar.gz kernel-6693731487a8145a9b039bc983d77edc47693855.zip | |
vsock/virtio: Allocate nonlinear SKBs for handling large transmit buffers
When transmitting a vsock packet, virtio_transport_send_pkt_info() calls
virtio_transport_alloc_linear_skb() to allocate and fill SKBs with the
transmit data. Unfortunately, these are always linear allocations and
can therefore result in significant pressure on kmalloc() considering
that the maximum packet size (VIRTIO_VSOCK_MAX_PKT_BUF_SIZE +
VIRTIO_VSOCK_SKB_HEADROOM) is a little over 64KiB, resulting in a 128KiB
allocation for each packet.
Rework the vsock SKB allocation so that, for sizes with page order
greater than PAGE_ALLOC_COSTLY_ORDER, a nonlinear SKB is allocated
instead with the packet header in the SKB and the transmit data in the
fragments. Note that this affects both the vhost and virtio transports.
Reviewed-by: Stefano Garzarella <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
Diffstat (limited to 'rust/helpers/regulator.c')
0 files changed, 0 insertions, 0 deletions