From: Borislav Petkov <bp@alien8.de>
To: Chuyi Zhou <zhouchuyi@bytedance.com>
Cc: tglx@kernel.org, mingo@redhat.com, luto@kernel.org,
peterz@infradead.org, paulmck@kernel.org, muchun.song@linux.dev,
dave.hansen@linux.intel.com, pbonzini@redhat.com,
bigeasy@linutronix.de, clrkwllms@kernel.org, rostedt@goodmis.org,
nadav.amit@gmail.com, vkuznets@redhat.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v10 00/14] Allow preemption during IPI completion waiting to improve real-time performance
Date: Thu, 23 Jul 2026 12:26:57 -0700 [thread overview]
Message-ID: <20260723192657.GBamJrAcb_TCH5Ubog@fat_crate.local> (raw)
In-Reply-To: <20260709122933.4021501-1-zhouchuyi@bytedance.com>
On Thu, Jul 09, 2026 at 08:29:19PM +0800, Chuyi Zhou wrote:
> In our production environments, latency-sensitive workloads (DPDK) are
> configured with the highest priority to preempt lower-priority tasks at any
> time. We discovered that DPDK's wake-up latency is primarily caused by the
> current CPU having preemption disabled. Therefore, we collected the maximum
> preemption disabled events within every 30-second interval and then
> calculated the P50/P99 of these max preemption disabled events:
Out of curiosity, can you run your workloads on AMD Zen3 and newer which have
TLBI support (this does away with the TLB flush IPIs). Do you see any
improvement there?
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2026-07-23 19:27 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-09 12:29 Chuyi Zhou
2026-07-09 12:29 ` [PATCH v10 01/14] smp: Disable preemption explicitly in __csd_lock_wait() Chuyi Zhou
2026-07-23 10:21 ` [tip: smp/core] " tip-bot2 for Chuyi Zhou
2026-07-09 12:29 ` [PATCH v10 02/14] smp: Enable preemption early in smp_call_function_single() Chuyi Zhou
2026-07-23 10:21 ` [tip: smp/core] " tip-bot2 for Chuyi Zhou
2026-07-09 12:29 ` [PATCH v10 03/14] smp: Refactor remote CPU selection in smp_call_function_any() Chuyi Zhou
2026-07-23 10:21 ` [tip: smp/core] " tip-bot2 for Chuyi Zhou
2026-07-09 12:29 ` [PATCH v10 04/14] smp: Use task-local IPI cpumask in smp_call_function_many_cond() Chuyi Zhou
2026-07-23 10:21 ` [tip: smp/core] " tip-bot2 for Chuyi Zhou
2026-07-09 12:29 ` [PATCH v10 05/14] smp: Alloc percpu csd data in smpcfd_prepare_cpu() only once Chuyi Zhou
2026-07-23 10:21 ` [tip: smp/core] " tip-bot2 for Chuyi Zhou
2026-07-09 12:29 ` [PATCH v10 06/14] smp: Enable preemption early in smp_call_function_many_cond() Chuyi Zhou
2026-07-23 10:21 ` [tip: smp/core] " tip-bot2 for Chuyi Zhou
2026-07-09 12:29 ` [PATCH v10 07/14] smp: Remove preempt_disable() from smp_call_function() Chuyi Zhou
2026-07-23 10:21 ` [tip: smp/core] " tip-bot2 for Chuyi Zhou
2026-07-09 12:29 ` [PATCH v10 08/14] smp: Remove preempt_disable() from on_each_cpu_cond_mask() Chuyi Zhou
2026-07-23 10:21 ` [tip: smp/core] " tip-bot2 for Chuyi Zhou
2026-07-09 12:29 ` [PATCH v10 09/14] scftorture: Remove preempt_disable() in scftorture_invoke_one() Chuyi Zhou
2026-07-23 10:21 ` [tip: smp/core] " tip-bot2 for Chuyi Zhou
2026-07-09 12:29 ` [PATCH v10 10/14] x86/mm: Factor out flush_tlb_info initialization Chuyi Zhou
2026-07-23 10:32 ` [tip: x86/mm] " tip-bot2 for Chuyi Zhou
2026-07-09 12:29 ` [PATCH v10 11/14] x86/mm: Cap flush_tlb_info alignment at 64 bytes Chuyi Zhou
2026-07-23 10:32 ` [tip: x86/mm] " tip-bot2 for Chuyi Zhou
2026-07-09 12:29 ` [PATCH v10 12/14] x86/mm: Move flush_tlb_info back to the stack Chuyi Zhou
2026-07-23 10:32 ` [tip: x86/mm] " tip-bot2 for Chuyi Zhou
2026-07-09 12:29 ` [PATCH v10 13/14] x86/kvm: Disable preemption in kvm_flush_tlb_multi() Chuyi Zhou
2026-07-23 10:32 ` [tip: x86/mm] " tip-bot2 for Chuyi Zhou
2026-07-09 12:29 ` [PATCH v10 14/14] x86/mm: Re-enable preemption before flush_tlb_multi() Chuyi Zhou
2026-07-23 10:32 ` [tip: x86/mm] " tip-bot2 for Chuyi Zhou
2026-07-16 14:14 ` [PATCH v10 00/14] Allow preemption during IPI completion waiting to improve real-time performance Chuyi Zhou
2026-07-16 21:18 ` Thomas Gleixner
2026-07-23 19:26 ` Borislav Petkov [this message]
2026-07-24 3:08 ` Chuyi Zhou
2026-08-11 21:22 ` Borislav Petkov
2026-08-12 3:56 ` Chuyi Zhou
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