From nobody Sun Feb 8 19:40:02 2026 Received: from out-174.mta0.migadu.com (out-174.mta0.migadu.com [91.218.175.174]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 18B7033F8D3 for ; Mon, 10 Nov 2025 23:27:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.174 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762817241; cv=none; b=QWdZHMOdlIyfU9/ONr/eQPR65fVjV04o6avqph/u8IBJLPaa8gHeYCSPsBXhAFI+IMzW2blTP2TbLmULPGhxsVO86SU78tkXV5Gw867cFvobvlF/s56s+3T9aBJSE+GMbKwRJs2N1fQIWnrr7BiJ1YoNQd/jZHq1GxNdko2WYvQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762817241; c=relaxed/simple; bh=R7zwZuvyaSOI5TNY55HsmjnEMbQF0WWfdkvp2+Cwf+w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DDP8GNn+LFEIUHMnAuLZvz6YvaK4G5ROwDd6Fo09RgbJvl/7awW6w9wHBH8fCqRGrAle47Aw2qygLYmqIr6LLDzjNHfyWFwbD972io7A1SHA6H7tiBrjYWZThHnyn+sfdze5ik80GamUCDEnmFa+S7LiH3KtVzDQoBVkzBhx8aY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=oCpHJD1S; arc=none smtp.client-ip=91.218.175.174 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="oCpHJD1S" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1762817236; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1i62BQEu9bU1+io1BGBNbqeSmq/IONYQhgqd3tEle5Y=; b=oCpHJD1StdepXk6QzIESZYYG4zkbkr67kzg1YI1uHG6SP0OQ7rMMyrfGrOfd6nskUGHGek cg0ejxSFJeDkVO/SSJf4/Bo+IqF0CptE9wS1MTl3SfhcaO8064YDeRqCvwBSiY/nC92N3d QlRa5PD/XQ3yPGaN7fdtp2UIvx7rpME= From: Yosry Ahmed To: Sean Christopherson Cc: Paolo Bonzini , Kevin Cheng , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Yosry Ahmed Subject: [PATCH v3 09/14] x86/svm: Deflake svm_tsc_scale_test Date: Mon, 10 Nov 2025 23:26:37 +0000 Message-ID: <20251110232642.633672-10-yosry.ahmed@linux.dev> In-Reply-To: <20251110232642.633672-1-yosry.ahmed@linux.dev> References: <20251110232642.633672-1-yosry.ahmed@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" On an AMT Turin (EPYC Zen 5), svm_tsc_scale_test flakes on the last test case with 0.0001 TSC scaling ratio, even with the 24-bit shift for stability. On failure, the actual value is 49 instead of the expected 50. Use a higher scaling ratio, 0.001, which makes the test pass consistently. Signed-off-by: Yosry Ahmed --- x86/svm_tests.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/x86/svm_tests.c b/x86/svm_tests.c index 61ab63db462dc..1e7556a37adec 100644 --- a/x86/svm_tests.c +++ b/x86/svm_tests.c @@ -943,7 +943,7 @@ static void svm_tsc_scale_test(void) } =20 svm_tsc_scale_run_testcase(50, 255, rdrand()); - svm_tsc_scale_run_testcase(50, 0.0001, rdrand()); + svm_tsc_scale_run_testcase(50, 0.001, rdrand()); } =20 static void latency_prepare(struct svm_test *test) --=20 2.51.2.1041.gc1ab5b90ca-goog