From: Wathsala Vithanage <wathsala.vithanage@arm.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>,
Tyler Retzlaff <roretzla@linux.microsoft.com>,
dev@dpdk.org, Ola Liljedahl <ola.liljedahl@arm.com>,
vattunuru@marvell.com
Subject: Re: [PATCH 1/1] eal: correct memory ordering in MCS lock
Date: Mon, 3 Nov 2025 11:30:27 -0600 [thread overview]
Message-ID: <b435dd1d-c56f-4d56-9f73-30ee1ec99eac@arm.com> (raw)
In-Reply-To: <20251103090717.2d181d95@phoenix>
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.
next prev parent reply other threads:[~2025-11-03 17:30 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 [this message]
2025-11-03 18:06 ` Konstantin Ananyev
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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