On 3/8/23 4:30 PM, Tony Lu wrote:
redis-benchmark on smc-r with atomic wr_tx_refcnt:
SET: 525817.62 requests per second, p50=0.087 msec
GET: 570841.44 requests per second, p50=0.087 msec
redis-benchmark on the percpu_ref version:
SET: 539956.81 requests per second, p50=0.087 msec
GET: 587613.12 requests per second, p50=0.079 msec
Does the test data need to be refreshed?
Will do.
diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h
index 08b457c2d294..1645fba0d2d3 100644
--- a/net/smc/smc_core.h
+++ b/net/smc/smc_core.h
@@ -106,7 +106,10 @@ struct smc_link {
unsigned long *wr_tx_mask; /* bit mask of used indexes */
u32 wr_tx_cnt; /* number of WR send buffers */
wait_queue_head_t wr_tx_wait; /* wait for free WR send buf */
- atomic_t wr_tx_refcnt; /* tx refs to link */
+ struct {
+ struct percpu_ref wr_tx_refs;
+ } ____cacheline_aligned_in_smp;
+ struct completion tx_ref_comp;
For the variable names suffixed with wr_*_refs, should we continue to
use wr_*_refcnt?
Thanks.
In my opinion, we can't get the count of the percpu reference until it
we start to destroy it. So maybe using wr_*_refcnt here is more
appropriate？
