implement io_uring notification (ubuf_info) stacking
Status from this message: Applied, thanks!
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- v2 Latest4 patches 4 repliesApplied 2/4
- v1 RFC6 patches 18 repliesSuperseded
Patches in v2 Applied · 2/4
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/4 | net: extend ubuf_info callback to ops structuredrivers/ drivers/ drivers/ +6 more | +46 | 1 reply | Applied |
| 2/4 | net: add callback for setting a ubuf_info to skbinclude/ net/ | +16 | 1 reply | Applied |
| 3/4 | io_uring/notif: simplify io_notif_flush()io_uring/ io_uring/ | +6 | 0 replies | |
| 4/4 | io_uring/notif: implement notification stackingio_uring/ io_uring/ | +67 | 0 replies |
Reviews trailers per patch
All 4 patches have a Reviewed-by or Acked-by.
| Patch | Jens Axboe | David Ahern | Willem de Bruijn |
|---|---|---|---|
| 1/4 | R-b | R-b | R-b |
| 2/4 | R-b | R-b | R-b |
| 3/4 | R-b | ||
| 4/4 | R-b |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes. Scroll the table sideways for all 3 reviewers.
Cover letter [PATCH io_uring-next/net-next v2 0/4] implement io_uring notification (ubuf_info) stacking
Please, don't take directly, conflicts with io_uring.
To have per request buffer notifications each zerocopy io_uring send request allocates a new ubuf_info. However, as an skb can carry only one uarg, it may force the stack to create many small skbs hurting performance in many ways.
The patchset implements notification, i.e. an io_uring's ubuf_info extension, stacking. It attempts to link ubuf_info's into a list, allowing to have multiple of them per skb.
liburing/examples/send-zerocopy shows up 6 times performance improvement for TCP with 4KB bytes per send, and levels it with MSG_ZEROCOPY. Without the patchset it requires much larger sends to utilise all potential.
bytes | before | after (Kqps) 1200 | 195 | 1023 4000 | 193 | 1386 8000 | 154 | 1058
The patches are on top of net-next + io_uring-next:
https://github.com/isilence/linux.git iou-sendzc/notif-stacking-v2
First two patches based on net-next:
https://github.com/isilence/linux.git iou-sendzc/notif-stacking-v2-netonly
v2: convert xen-netback to ubuf_info_ops (patch 1)
drop two separately merged io_uring patches
Pavel Begunkov (4):
net: extend ubuf_info callback to ops structure
net: add callback for setting a ubuf_info to skb io_uring/notif: simplify io_notif_flush() io_uring/notif: implement notification stacking
drivers/net/tap.c | 2 +- drivers/net/tun.c | 2 +- drivers/net/xen-netback/common.h | 5 +- drivers/net/xen-netback/interface.c | 2 +- drivers/net/xen-netback/netback.c | 11 ++-- drivers/vhost/net.c | 8 ++- include/linux/skbuff.h | 21 +++++--- io_uring/notif.c | 83 +++++++++++++++++++++++++---- io_uring/notif.h | 12 ++--- net/core/skbuff.c | 36 ++++++++----- 10 files changed, 134 insertions(+), 48 deletions(-)
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