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From: Joel Fernandes <joelagnelf@nvidia.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org, Andrea Righi <arighi@nvidia.com>,
	Tejun Heo <tj@kernel.org>, Ingo Molnar <mingo@redhat.com>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
	Valentin Schneider <vschneid@redhat.com>,
	David Vernet <void@manifault.com>,
	Changwoo Min <changwoo@igalia.com>,
	Luigi De Matteis <ldematteis123@gmail.com>,
	paulmck@kernel.org, boqun.feng@gmail.com
Subject: Re: [PATCH RFC 3/8] sched/ext: Add a DL server for sched_ext tasks
Date: Mon, 17 Mar 2025 22:53:10 +0100	[thread overview]
Message-ID: <0c0480f3-6793-4d3e-bdbe-c503d50a0c02@nvidia.com> (raw)
In-Reply-To: <20250317103101.GC34541@noisy.programming.kicks-ass.net>

Hello, Peter,

I replied to other parts of your email in another thread so I am just replying
to this part:

On 3/17/2025 11:31 AM, Peter Zijlstra wrote:
> 
> Also; I gotta ask, why is nvidia looking at ext ?

There are some complex CPU topologies which perform poorly with the existing
FAIR scheduler as reported by people (I have not seen the data though so there's
that).

There are also workloads where it is beneficial to schedule on cores which have
the data in their cache and are submitting work to GPGPU, which makes the GPGPU
operations faster.

thanks,

 - Joel



  parent reply	other threads:[~2025-03-17 21:53 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-03-15  2:21 [PATCH RFC 0/8] Add a deadline " Joel Fernandes
2025-03-15  2:21 ` [PATCH RFC 1/8] sched: Add support to pick functions to take rf Joel Fernandes
2025-03-15  2:21 ` [PATCH RFC 2/8] sched: Add a server arg to dl_server_update_idle_time() Joel Fernandes
2025-03-15  2:21 ` [PATCH RFC 3/8] sched/ext: Add a DL server for sched_ext tasks Joel Fernandes
2025-03-15  7:22   ` Peter Zijlstra
2025-03-15 23:15     ` Joel Fernandes
2025-03-17 10:31       ` Peter Zijlstra
2025-03-17 16:57         ` Tejun Heo
2025-03-17 17:06           ` Peter Zijlstra
2025-03-17 21:48             ` Joel Fernandes
2025-03-17 22:16               ` Tejun Heo
2025-03-17 22:39                 ` Joel Fernandes
2025-03-17 22:48                   ` Tejun Heo
2025-03-18 10:07                     ` Joel Fernandes
2025-03-17 21:53         ` Joel Fernandes [this message]
2025-03-15 17:56   ` Andrea Righi
2025-03-15 23:17     ` Joel Fernandes
2025-03-15  2:21 ` [PATCH RFC 4/8] sched/debug: Fix updating of ppos on server write ops Joel Fernandes
2025-03-15  2:21 ` [PATCH RFC 5/8] sched/debug: Stop and start server based on if it was active Joel Fernandes
2025-03-15  2:21 ` [PATCH RFC 6/8] sched/debug: Add support to change sched_ext server params Joel Fernandes
2025-03-15  2:21 ` [PATCH RFC 7/8] sched/deadline: Clear defer params Joel Fernandes
2025-03-15  2:21 ` [PATCH RFC 8/8] selftests/sched_ext: Add test for sched_ext dl_server Joel Fernandes
2025-03-15 23:22   ` Joel Fernandes

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