diff options
| author | Pavel Begunkov <asml.silence@gmail.com> | 2025-04-05 11:17:49 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2025-04-07 07:36:52 -0600 |
| commit | 9b58440a5b2fe78102ce1e9e03946645558d0f55 (patch) | |
| tree | af860850b3156c9aee0913165bbb3a8e8d2f8663 /io_uring | |
| parent | ab6005f3912fff07330297aba08922d2456dcede (diff) | |
io_uring/zcrx: put refill data into separate cache line
Refill queue lock and other bits are only used from the allocation path
on the rx softirq side, but it shares the cache line with other fields
like ctx that are used also in the "syscall" path, which causes cache
bouncing when softirq runs on a different CPU.
Separate them into different cache lines. The first one now contains
constant fields used by both contextx, followed by a line responsible
for refill queue data.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/6d1f598e27d623c07fc49d6baee13089a9b1216c.1743848241.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/zcrx.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/io_uring/zcrx.h b/io_uring/zcrx.h index 706cc7300780..b59c560d5d84 100644 --- a/io_uring/zcrx.h +++ b/io_uring/zcrx.h @@ -26,11 +26,11 @@ struct io_zcrx_ifq { struct io_ring_ctx *ctx; struct io_zcrx_area *area; + spinlock_t rq_lock ____cacheline_aligned_in_smp; struct io_uring *rq_ring; struct io_uring_zcrx_rqe *rqes; - u32 rq_entries; u32 cached_rq_head; - spinlock_t rq_lock; + u32 rq_entries; u32 if_rxq; struct device *dev; |