[rds-devel] [PATCH RESEND V3 net-next 0/3] RDS: optimized notification for zerocopy completion
Sowmini Varadhan
sowmini.varadhan at oracle.com
Tue Feb 27 09:08:01 PST 2018
Resending with acked-by additions: previous attempt does not show
up in Patchwork.
RDS applications use predominantly request-response, transacation
based IPC, so that ingress and egress traffic are well-balanced,
and it is possible/desirable to reduce system-call overhead by
piggybacking the notifications for zerocopy completion response
with data.
Moreover, it has been pointed out that socket functions block
if sk_err is non-zero, thus if the RDS code does not plan/need
to use sk_error_queue path for completion notification, it
is preferable to remove the sk_errror_queue related paths in
RDS.
Both of these goals are implemented in this series.
v2: removed sk_error_queue support
v3: incorporated additional code review comments (details in each patch)
Sowmini Varadhan (3):
selftests/net: revert the zerocopy Rx path for PF_RDS
rds: deliver zerocopy completion notification with data
selftests/net: reap zerocopy completions passed up as ancillary data.
include/uapi/linux/errqueue.h | 2 -
include/uapi/linux/rds.h | 7 ++
net/rds/af_rds.c | 7 +-
net/rds/message.c | 38 ++++-----
net/rds/rds.h | 2 +
net/rds/recv.c | 31 +++++++-
tools/testing/selftests/net/msg_zerocopy.c | 120 ++++++++++++----------------
7 files changed, 111 insertions(+), 96 deletions(-)
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