From: Dave Hansen <dave.hansen@intel.com>
To: david laight <david.laight@runbox.com>,
Mateusz Guzik <mjguzik@gmail.com>
Cc: x86@kernel.org, glx@linutronix.de, mingo@redhat.com,
bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com,
linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
olichtne@redhat.com, atomasov@redhat.com, aokuliar@redhat.com
Subject: Re: performance anomaly in rep movsq/movsb as seen on Sapphire Rapids executing sync_regs()
Date: Wed, 3 Dec 2025 13:35:52 -0800 [thread overview]
Message-ID: <e600cb9f-e6d4-461a-b7c5-de60162cd6fc@intel.com> (raw)
In-Reply-To: <20251127095801.0473d641@pumpkin>
On 11/27/25 01:58, david laight wrote:
> I wonder if Sapphire Rapids has some similar perversion?
> Or, is that one of the big/little cpu where most of the cpu are
> actually atom ones - which may not have either ERMS or FSRM ?
No, if it's really Sapphire Rapids, then the CPUs are homogeneous.
next prev parent reply other threads:[~2025-12-03 21:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-27 6:55 performance anomaly in rep movsq/movsb as seen on Sapphire Rapids executing sync_regs() Mateusz Guzik
2025-11-27 9:58 ` david laight
2025-12-03 21:35 ` Dave Hansen [this message]
2025-12-03 21:37 ` Dave Hansen
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