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From: Floris Westermann <westermann@google.com>
To: Cristian Marussi <cristian.marussi@arm.com>
Cc: linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	virtualization@lists.linux-foundation.org,
	virtio-dev@lists.oasis-open.org, sudeep.holla@arm.com,
	james.quinlan@broadcom.com, Jonathan.Cameron@huawei.com,
	f.fainelli@gmail.com, etienne.carriere@linaro.org,
	vincent.guittot@linaro.org, souvik.chakravarty@arm.com,
	igor.skalkin@opensynergy.com, peter.hilber@opensynergy.com,
	alex.bennee@linaro.org, jean-philippe@linaro.org,
	mikhail.golubev@opensynergy.com, anton.yakovlev@opensynergy.com,
	Vasyl.Vavrychuk@opensynergy.com,
	Andriy.Tryshnivskyy@opensynergy.com
Subject: Re: [PATCH v6 00/17] Introduce SCMI transport based on VirtIO
Date: Wed, 11 Aug 2021 09:31:21 +0000	[thread overview]
Message-ID: <YROY6YntswWxfaub@google.com> (raw)
In-Reply-To: <20210712141833.6628-1-cristian.marussi@arm.com>

Hi Cristian,

I am currently working on an interface for VMs to communicate their
performance requirements to the hosts by passing through cpu frequency
adjustments.

Your patch looks very interesting but I have some questions:


On Mon, Jul 12, 2021 at 03:18:16PM +0100, Cristian Marussi wrote:
>
> The series has been tested using an emulated fake SCMI device and also a
> proper SCP-fw stack running through QEMU vhost-users, with the SCMI stack
> compiled, in both cases, as builtin and as a loadable module, running tests
> against mocked SCMI Sensors using HWMON and IIO interfaces to check the
> functionality of notifications and sync/async commands.
>
> Virtio-scmi support has been exercised in the following testing scenario
> on a JUNO board:
>
>  - normal sync/async command transfers
>  - notifications
>  - concurrent delivery of correlated response and delayed responses
>  - out-of-order delivery of delayed responses before related responses
>  - unexpected delayed response delivery for sync commands
>  - late delivery of timed-out responses and delayed responses
>
> Some basic regression testing against mailbox transport has been performed
> for commands and notifications too.
>
> No sensible overhead in total handling time of commands and notifications
> has been observed, even though this series do indeed add a considerable
> amount of code to execute on TX path.
> More test and measurements could be needed in these regards.
>

Can you share any data and benchmarks using you fake SCMI device.
Also, could you provide the emulated device code so that the results can
be reproduced.


Cheers,
Floris

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  parent reply	other threads:[~2021-08-11  9:49 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-12 14:18 [PATCH v6 00/17] Introduce SCMI transport based on VirtIO Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 01/17] firmware: arm_scmi: Avoid padding in sensor message structure Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 02/17] firmware: arm_scmi: Fix max pending messages boundary check Cristian Marussi
2021-07-14 16:46   ` Sudeep Holla
2021-07-12 14:18 ` [PATCH v6 03/17] firmware: arm_scmi: Add support for type handling in common functions Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 04/17] firmware: arm_scmi: Remove scmi_dump_header_dbg() helper Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 05/17] firmware: arm_scmi: Add transport optional init/exit support Cristian Marussi
2021-07-28 11:40   ` Sudeep Holla
2021-07-28 12:28     ` Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 06/17] firmware: arm_scmi: Introduce monotonically increasing tokens Cristian Marussi
2021-07-28 14:17   ` Sudeep Holla
2021-07-28 16:54     ` Cristian Marussi
2021-08-02 10:24       ` Sudeep Holla
2021-08-03 12:52         ` Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 07/17] firmware: arm_scmi: Handle concurrent and out-of-order messages Cristian Marussi
2021-07-15 16:36   ` Peter Hilber
2021-07-19  9:14     ` Cristian Marussi
2021-07-22  8:32       ` Peter Hilber
2021-07-28  8:31         ` Cristian Marussi
2021-08-02 10:10   ` Sudeep Holla
2021-08-02 10:27     ` Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 08/17] firmware: arm_scmi: Add priv parameter to scmi_rx_callback Cristian Marussi
2021-07-28 14:26   ` Sudeep Holla
2021-07-28 17:25     ` Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 09/17] firmware: arm_scmi: Make .clear_channel optional Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 10/17] firmware: arm_scmi: Make polling mode optional Cristian Marussi
2021-07-15 16:36   ` Peter Hilber
2021-07-19  9:15     ` Cristian Marussi
2021-07-28 14:34   ` Sudeep Holla
2021-07-28 17:41     ` Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 11/17] firmware: arm_scmi: Make SCMI transports configurable Cristian Marussi
2021-07-28 14:50   ` Sudeep Holla
2021-07-29 16:18     ` Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 12/17] firmware: arm_scmi: Make shmem support optional for transports Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 13/17] firmware: arm_scmi: Add method to override max message number Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 14/17] firmware: arm_scmi: Add message passing abstractions for transports Cristian Marussi
2021-07-15 16:36   ` Peter Hilber
2021-07-19  9:16     ` Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 15/17] firmware: arm_scmi: Add optional link_supplier() transport op Cristian Marussi
2021-07-28 15:36   ` Sudeep Holla
2021-07-29 16:19     ` Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 16/17] dt-bindings: arm: Add virtio transport for SCMI Cristian Marussi
2021-07-12 14:18 ` [PATCH v6 17/17] firmware: arm_scmi: Add virtio transport Cristian Marussi
2021-07-15 16:35 ` [PATCH v6 00/17] Introduce SCMI transport based on VirtIO Peter Hilber
2021-07-19 11:36   ` Cristian Marussi
2021-07-22  8:30     ` Peter Hilber
2021-08-11  9:31 ` Floris Westermann [this message]
2021-08-11 15:26   ` Cristian Marussi

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