Re: [PATCH net-next v1 2/2] net/smc: reduce TX slot contention with exclusive wait

On Fri, Aug 07, 2026 at 11:15:22AM +0530, Mahanta Jambigi wrote:
> 
> 
> On 06/08/26 12:12 pm, D. Wythe wrote:
> > smc_wr_tx_get_free_slot() waits for a free TX slot with
> > wait_event_interruptible_timeout(). Since the wait_event family
> > enqueues waiters as non-exclusive, wake_up() may wake multiple
> > waiters even though only one can use the slot, causing
> > thundering-herd contention when slots are scarce.
> 
> Have you run any performance benchmarks (e.g. redis-benchmark or uperf)
> to quantify the benefit of this change?
> 
> Since the motivation is to reduce contention caused by multiple waiters
> being awakened for a single available TX slot, it would be helpful to
> see measurable results. Please share the baseline and patched throughput
> figures, and any observed throughput differences.

Yes, I ran uperf, and I have added the baseline vs patched figures to the commit
message of patch 2 in v2.

Best regards,
D. Wythe