Re: [PATCH 0/2] net: Use synchronous wakeups selectively

[Srikar Dronamraju]

* Eric Dumazet <edumazet@xxxxxxxxxx> [2026-07-23 05:17:08]:

> On Wed, Jul 22, 2026 at 7:08 PM Jakub Kicinski <kuba@xxxxxxxxxx> wrote:
> >
> > On Tue, 14 Jul 2026 07:09:41 +0530 Srikar Dronamraju wrote:
> > > The scheduler assumes in several wakeup paths that a task using WF_SYNC
> > > is likely to yield the CPU shortly. However several networking wakeup
> > > paths unconditionally use synchronous wakeups even when the waking task
> > > continues execution.
> >
> > Somewhat related recent patch:
> >
> > https://lore.kernel.org/all/20260708133815.3419465-1-usama.arif@xxxxxxxxx/
> >
> > Maybe other maintainers will chime in, but I'm not convinced
> > by the heuristics you're adding. The behavior will be workload
> > specific. The extent of networking involvement should be letting
> > the scheduler know that we're waking from IO, not leaking scheduler
> > heuristics into networking.
> > --
> > pw-bot: cr
> 
> In any case, adding code to the fast path in every network system call
> is undesirable.

Yes, I understand adding code in fast path is undesirable. However as
mentioned previous reply, we need to differentiate between blocking and
non-blocking API. Doing unconditional nonblocking, is probably even worse.

-- 
Thanks and Regards
Srikar Dronamraju