From: Konstantin Ananyev <konstantin.ananyev@huawei.com>
To: Wathsala Vithanage <wathsala.vithanage@arm.com>,
Stephen Hemminger <stephen@networkplumber.org>
Cc: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>,
Tyler Retzlaff <roretzla@linux.microsoft.com>,
"dev@dpdk.org" <dev@dpdk.org>,
Ola Liljedahl <ola.liljedahl@arm.com>,
"vattunuru@marvell.com" <vattunuru@marvell.com>
Subject: RE: [PATCH 1/1] eal: correct memory ordering in MCS lock
Date: Mon, 3 Nov 2025 18:06:05 +0000 [thread overview]
Message-ID: <d63bc45cb32848299574333fed5e5406@huawei.com> (raw)
In-Reply-To: <b435dd1d-c56f-4d56-9f73-30ee1ec99eac@arm.com>
>
> On 11/3/25 11:07, Stephen Hemminger wrote:
> > On Mon, 3 Nov 2025 09:12:39 -0600
> > Wathsala Vithanage <wathsala.vithanage@arm.com> wrote:
> >
> >> MCS lock is broken, it's just a matter of time it will run into a deadlock.
> >>
> >> drivers/dma/cnxk is a user of MCS lock.
> > I am surprised that a driver would use mcslock.
> > MCSlock is targeted at case of large number of CPU's with lots of contention.
> > It will likely be slower than spinlock or ticketlock for the use case of driver.
> It appears in |drivers/dma/cnxk/cnxk_dmadev_fp.c|, perhaps the
> maintainer can clarify.
>
If MCS lock is really broken, it needs to be fixed anyway.
It might be used by other third-party libs/apps that do use on DPDK.
next prev parent reply other threads:[~2025-11-03 18:06 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-23 18:47 Wathsala Vithanage
2025-11-03 15:12 ` Wathsala Vithanage
2025-11-03 17:07 ` Stephen Hemminger
2025-11-03 17:30 ` Wathsala Vithanage
2025-11-03 18:06 ` Konstantin Ananyev [this message]
2025-11-03 18:47 ` Wathsala Vithanage
2025-11-03 18:48 ` Stephen Hemminger
2025-11-03 19:13 ` Wathsala Vithanage
2025-11-04 8:18 ` Konstantin Ananyev
2025-11-03 23:48 ` Stephen Hemminger
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