From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 37A6026F2A6 for ; Sun, 14 Dec 2025 16:31:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=63.228.1.57 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765729903; cv=none; b=KEBhvfR66BC6b4odN8LAFPNxBl1Yvtj4WmcHGqAYSYXAFnM9uGJUiKAkJgRpk7Ufe6mjEeZPzEfhg0A5Jqqo2Lpn0iJBEaqSDp71/0TZzIsacAMORJ46h2/xR4ZupAf2quDK1TNFMB9lMU3vqaWu6IAQ7nnND77bBUAfYvQdx+M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765729903; c=relaxed/simple; bh=5TGM6jfU10b3zsUvfmp8PUEh62v+llQcRTKwEd9aLEA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=arBAAoAzEM7KWTAXCywy2C6uylNiMroAbZ+XL9iN9jevV4QYQ/g44EgeCjur3xfBBhWQ43tSVeeqfJQSmxyY6Qbuv5Fug1f7SC8JS9oK1jjKt9fRAux0VLzHoaOkRaavVeTkxng/eZ4p6QTh0vVeazR/KEtCqzF40Qpdrcw6d30= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org; spf=pass smtp.mailfrom=kernel.crashing.org; arc=none smtp.client-ip=63.228.1.57 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kernel.crashing.org 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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