From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EA06BD5B16D for ; Sun, 14 Dec 2025 16:21:50 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4dTpNs3J9lz2xlF; Mon, 15 Dec 2025 03:21:49 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=63.228.1.57 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1765729309; cv=none; b=EWA0gLrI4kcsbFSLYt3Ei9s4lnpGwcaIt6p9uoWRoyJeD7/P+EnMtreQxhefAlPGQ7yjshgRsvVVVDMfUTNkQlW335i2LYcw32lICoE+czfygSvS6/SzLAfoxmStZYGT3IcLPttcxMOyrBGCbcfXVsutl7VM8f9oSBdZyZ2A/90SOFhSDRI48JW2DhFSRw5xxPvWupC9itFJsOKPQcietOH6cPDDcJv6KnxyicIt8Xb7Hb0MUpwjzE4TpJqG6/Sn57cozzXzRn2gJaEZQt5/fcHMoM6Q/YjM5ShhA7PQuGxO56V5+t6ui8PvyW6XtrIfbML02JqOgDsZLnnRRKXIog== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1765729309; c=relaxed/relaxed; bh=yCYUJ8pl9FRuP9DO5eN8HwTNaZQZHzZq2dQ9SpjXEXA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=dWYPTIgcxxs+y56JaJnqcp4ghGKRzdGFTSSHj1tt/pWHiGMLtqU9iQ7AX9S/5BiybjVRqfU7lK54Iq4TO4T9houNoRNeCT3RmS8biwG6oBLzC/yrCj+9JMcj8JXCtxlwl6CLgqyobrFsykMMY/UFvgcWBTU+hml0DO3eZtQ5+75ukpmWbbStn6hekTjxTN22n4CwOONjWJB5qKays/dHG9pX8zNIV33wnI/PzBFCqwZ4FthoR+4F1PTg4Lc8F64Jcymcv9/IMw5wDA/5LCPn84d8AYW+eSxtuk/3+bgJpYfV9FTzBau8xybTQtpf9GIRm5u5K5OgJ3l8dp63ttDtBg== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org; spf=pass (client-ip=63.228.1.57; helo=gate.crashing.org; envelope-from=segher@kernel.crashing.org; receiver=lists.ozlabs.org) smtp.mailfrom=kernel.crashing.org Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.crashing.org (client-ip=63.228.1.57; helo=gate.crashing.org; envelope-from=segher@kernel.crashing.org; receiver=lists.ozlabs.org) Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) by lists.ozlabs.org (Postfix) with ESMTP id 4dTpNq3hDlz2xbQ for ; Mon, 15 Dec 2025 03:21:46 +1100 (AEDT) Received: from gate.crashing.org (localhost [127.0.0.1]) by gate.crashing.org (8.18.1/8.18.1/Debian-2) with ESMTP id 5BEGKJx1148156; Sun, 14 Dec 2025 10:20:19 -0600 Received: (from segher@localhost) by gate.crashing.org (8.18.1/8.18.1/Submit) id 5BEGKCM4148153; Sun, 14 Dec 2025 10:20:12 -0600 X-Authentication-Warning: gate.crashing.org: segher set sender to segher@kernel.crashing.org using -f Date: Sun, 14 Dec 2025 10:20:12 -0600 From: Segher Boessenkool To: Mukesh Kumar Chaurasiya Cc: maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, oleg@redhat.com, kees@kernel.org, luto@amacapital.net, wad@chromium.org, mchauras@linux.ibm.com, thuth@redhat.com, sshegde@linux.ibm.com, charlie@rivosinc.com, macro@orcam.me.uk, akpm@linux-foundation.org, ldv@strace.io, deller@gmx.de, ankur.a.arora@oracle.com, tglx@linutronix.de, thomas.weissschuh@linutronix.de, peterz@infradead.org, menglong8.dong@gmail.com, bigeasy@linutronix.de, namcao@linutronix.de, kan.liang@linux.intel.com, mingo@kernel.org, atrajeev@linux.vnet.ibm.com, mark.barnett@arm.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 8/8] powerpc: Enable Generic Entry/Exit for syscalls. Message-ID: References: <20251214130245.43664-1-mkchauras@linux.ibm.com> <20251214130245.43664-9-mkchauras@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251214130245.43664-9-mkchauras@linux.ibm.com> Hi! On Sun, Dec 14, 2025 at 06:32:44PM +0530, Mukesh Kumar Chaurasiya wrote: > > | Test | With Patch | Without Patch | % Change | > | --------------- | ---------- | ------------- | -------- | > | fork usec/op | 833.986 | 814.809 | +2.35% | What causes this regression, did you investigate? Maybe there is something simple you can do to avoid this degradation :-) All other numbers look just fine :-) > | Test | With Patch | Without Patch | % Change | > | --------------- | ---------- | ------------- | -------- | > | fork ops/sec | 1,199 | 1,227 | -2.28% | (Same thing seen from another side) Segher