tcp-zerocopy: Return inq along with tcp receive zerocopy.

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This patchset is intended to reduce the number of extra system calls
imposed by TCP receive zerocopy. For ping-pong RPC style workloads,
this patchset has demonstrated a system call reduction of about 30%
when coupled with userspace changes.

For applications using edge-triggered epoll, returning inq along with
the result of tcp receive zerocopy could remove the need to call
recvmsg()=-EAGAIN after a successful zerocopy. Generally speaking,
since normally we would need to perform a recvmsg() call for every
successful small RPC read via TCP receive zerocopy, returning inq can
reduce the number of system calls performed by approximately half.

Signed-off-by: Arjun Roy <arjunroy@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Arjun Roy 2020-02-14 15:30:49 -08:00 • committed by David S. Miller

parent 8c8da5b8ea

commit c8856c0514

2 changed files with 15 additions and 1 deletions

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1

include/uapi/linux/tcp.h

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15

net/ipv4/tcp.c

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