From: Pavel Machek <pavel@denx.de>
To: Sasha Levin <sashal@kernel.org>
Cc: Pavel Machek <pavel@denx.de>, Borislav Petkov <bp@alien8.de>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
tglx@linutronix.de, mingo@redhat.com,
dave.hansen@linux.intel.com, x86@kernel.org, puwen@hygon.cn,
seanjc@google.com, kim.phillips@amd.com, jmattson@google.com,
babu.moger@amd.com, peterz@infradead.org,
rick.p.edgecombe@intel.com, brgerst@gmail.com,
ashok.raj@intel.com, mjguzik@gmail.com, jpoimboe@kernel.org,
nik.borisov@suse.com, aik@amd.com, vegard.nossum@oracle.com,
daniel.sneddon@linux.intel.com, acdunlap@google.com,
Erwan Velu <erwanaliasr1@gmail.com>
Subject: Re: [PATCH AUTOSEL 5.15 11/12] x86/barrier: Do not serialize MSR accesses on AMD
Date: Fri, 29 Nov 2024 22:27:22 +0100 [thread overview]
Message-ID: <Z0oxuu/AASgIOkTa@duo.ucw.cz> (raw)
In-Reply-To: <Z0opMka39d0mV3DZ@sashalap>
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Hi!
> > > - Serious issues as reported by a user of a distribution kernel may also
> > > be considered if they fix a notable performance or interactivity issue.
> > >
> > > It sounds like what's going on here, no?
> >
> > Is it? I'd not expect this to be visible in anything but
> > microbenchmarks. Do you have user reports hitting this?
> >
> > It is not like this makes kernel build 10% slower, is it?
>
> On Fri, Nov 29, 2024 at 10:30:11AM +0100, Erwan Velu wrote:
> > This patch greatly impacts servers on production with AMD systems that
> > have lasted since 5.11, having it backported really improves systems
> > performance.
> > Since this patch, I can share that our database team is no longer
> > paged during the night, that's a real noticeable impact.
Ok, looks like I misjudged the performance impact, sorry for the
noise.
Best regards,
Pavel
--
DENX Software Engineering GmbH, Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
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next prev parent reply other threads:[~2024-11-29 21:27 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-15 23:26 [PATCH AUTOSEL 5.15 01/12] watch_queue: fix kcalloc() arguments order Sasha Levin
2024-01-15 23:26 ` [PATCH AUTOSEL 5.15 02/12] powerpc/mm: Fix null-pointer dereference in pgtable_cache_add Sasha Levin
2024-01-15 23:26 ` Sasha Levin
2024-01-15 23:26 ` [PATCH AUTOSEL 5.15 03/12] arm64: irq: set the correct node for VMAP stack Sasha Levin
2024-01-15 23:26 ` Sasha Levin
2024-01-15 23:26 ` [PATCH AUTOSEL 5.15 04/12] drivers/perf: pmuv3: don't expose SW_INCR event in sysfs Sasha Levin
2024-01-15 23:26 ` Sasha Levin
2024-01-15 23:26 ` [PATCH AUTOSEL 5.15 05/12] powerpc: Fix build error due to is_valid_bugaddr() Sasha Levin
2024-01-15 23:26 ` Sasha Levin
2024-01-15 23:26 ` [PATCH AUTOSEL 5.15 06/12] powerpc/mm: Fix build failures due to arch_reserved_kernel_pages() Sasha Levin
2024-01-15 23:26 ` Sasha Levin
2024-01-15 23:26 ` [PATCH AUTOSEL 5.15 07/12] powerpc/64s: Fix CONFIG_NUMA=n build due to create_section_mapping() Sasha Levin
2024-01-15 23:26 ` Sasha Levin
2024-01-15 23:26 ` [PATCH AUTOSEL 5.15 08/12] x86/boot: Ignore NMIs during very early boot Sasha Levin
2024-01-15 23:26 ` [PATCH AUTOSEL 5.15 09/12] powerpc: pmd_move_must_withdraw() is only needed for CONFIG_TRANSPARENT_HUGEPAGE Sasha Levin
2024-01-15 23:26 ` Sasha Levin
2024-01-15 23:26 ` [PATCH AUTOSEL 5.15 10/12] powerpc/lib: Validate size for vector operations Sasha Levin
2024-01-15 23:26 ` Sasha Levin
2024-01-15 23:26 ` [PATCH AUTOSEL 5.15 11/12] x86/barrier: Do not serialize MSR accesses on AMD Sasha Levin
2024-11-28 11:59 ` Borislav Petkov
2024-11-28 15:52 ` Sasha Levin
2024-11-28 16:08 ` Erwan Velu
2024-11-28 16:43 ` Borislav Petkov
2024-11-29 0:21 ` Sasha Levin
2024-11-29 9:30 ` Erwan Velu
2024-11-29 13:33 ` Borislav Petkov
2024-11-29 15:37 ` Sasha Levin
2024-11-29 21:18 ` Erwan Velu
2024-11-29 13:30 ` Borislav Petkov
2024-11-29 9:45 ` Pavel Machek
2024-11-29 13:38 ` Sasha Levin
2024-11-29 20:34 ` Pavel Machek
2024-11-29 20:50 ` Sasha Levin
2024-11-29 21:27 ` Pavel Machek [this message]
2024-01-15 23:26 ` [PATCH AUTOSEL 5.15 12/12] x86/mce: Mark fatal MCE's page as poison to avoid panic in the kdump kernel Sasha Levin
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