From nobody Fri Dec 19 12:28:41 2025 Received: from out-171.mta1.migadu.com (out-171.mta1.migadu.com [95.215.58.171]) (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 6819F2E6CC0 for ; Tue, 4 Nov 2025 19:31:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762284684; cv=none; b=MwSO6cThhSN9ipYmkJxTQPLyxzHZ2IJlUjq931kRgJfYOBU05y1/KFdcEHPyCgS/UyZErSw0FbU0UcOyJLRcz/U+8GI75VbL8CcpWVIsqVgKptYiOgFlyWvEG4Dk9Hg4lkCqJ1Wrx2+6beUL5G2dhJ1Y+YpKDB5JDesKIw4416g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762284684; c=relaxed/simple; bh=+ZJA6Q75MIRb7BPwJQxYYkjbOwsjL+1qbka9doCeMbA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Q7JGntK26mFGpmiLFW4M2hUC4GJt2PZzumHoWr/iAc3DK4YsIgmDNNyi2i8yO2lHH1LLiLj0IVDoE+/Eye9ZMQVr4uZ8fPLvSypuJv5ZSEcMLsUmD7jRrM5Ie5CpvLVUbw+JQvZ06AVQCg2Ajp/UMp3wuf7zaonGG0J8NdhJvXA= 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=JMwYmvBO; arc=none smtp.client-ip=95.215.58.171 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="JMwYmvBO" 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=1762284680; 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=givJI//PiAABh+/f+gBvpZ0lroLLWSUedcKqAHccxGg=; b=JMwYmvBOMhpEjCwRCpCXCEUnynnZCC36OZL1GruFCVBVHW6+CLEIPl1+ZWyjQUhagROsBD JaScDP0pzUaLU1yohIV7iNXFG0lQZwEl0EkFsHdxUv7YQhGMf54KjZ2onkBGmXI5GBEAi7 QJb7krxIBAYJF+vcb7qwaPwh1lAPAR0= From: Yosry Ahmed To: Sean Christopherson Cc: Paolo Bonzini , Jim Mattson , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Yosry Ahmed Subject: [kvm-unit-tests 4/4] x86/svm: Deflake svm_tsc_scale_test Date: Tue, 4 Nov 2025 19:30:16 +0000 Message-ID: <20251104193016.3408754-5-yosry.ahmed@linux.dev> In-Reply-To: <20251104193016.3408754-1-yosry.ahmed@linux.dev> References: <20251104193016.3408754-1-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 8d309860e76e5..29c899762b7a4 100644 --- a/x86/svm_tests.c +++ b/x86/svm_tests.c @@ -1002,7 +1002,7 @@ 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 2.51.2.1026.g39e6a42477-goog