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Increase the TCP socket buffer length

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This commit is contained in:
Ruihan Li
2024-09-30 16:03:46 +08:00
committed by Tate, Hongliang Tian
parent 17ea6e91b0
commit 76d4b180d0
1 changed files with 16 additions and 4 deletions
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20
kernel/libs/aster-bigtcp/src/socket/unbound.rs
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@ -53,11 +53,23 @@ impl<T> UnboundSocket<T> {
}
}
// For TCP
pub const TCP_RECV_BUF_LEN: usize = 65536;
pub const TCP_SEND_BUF_LEN: usize = 65536;
// TCP socket buffer sizes:
//
// According to
// <https://github.com/torvalds/linux/blob/9852d85ec9d492ebef56dc5f229416c925758edc/include/net/sock.h#L2798-L2806>
// and
// <https://github.com/torvalds/linux/blob/9852d85ec9d492ebef56dc5f229416c925758edc/net/core/sock.c#L286-L287>,
// it seems that the socket buffer should be 256 packets * 256 bytes/packet = 65536 bytes by
// default. However, the loopback MTU is also 65536 bytes, and having the same size for the socket
// buffer and the MTU will cause the implementation of Nagle's algorithm in smoltcp to behave
// abnormally (see <https://github.com/asterinas/asterinas/pull/1396>). So the socket buffer size
// is increased from 64K to 128K.
//
// TODO: Consider allowing user programs to set the socket buffer length via `setsockopt` system calls.
pub const TCP_RECV_BUF_LEN: usize = 65536 * 2;
pub const TCP_SEND_BUF_LEN: usize = 65536 * 2;
// For UDP
// UDP socket buffer sizes:
pub const UDP_SEND_PAYLOAD_LEN: usize = 65536;
pub const UDP_RECV_PAYLOAD_LEN: usize = 65536;
const UDP_METADATA_LEN: usize = 256;