From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f52.google.com (mail-ot1-f52.google.com [209.85.210.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E941F4D9E8 for ; Thu, 18 Apr 2024 16:15:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.52 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713456915; cv=none; b=GNZOYGAi3YdxKf61H4m6TWfxQxWl9FBlcm9sab5ezQ5TqsfXcYmpDyM16YM6xVcSGg6BUYiGRcWLbz26qzOqpSw2pnjtnlKFYpQI/TNUhvGg8BuMUO7tGAyrhsmqBJh48gmjfY+Q0GiPdUpB2iBhwjO2FKHjMHWvaHezeMyZi6M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713456915; c=relaxed/simple; bh=q/oyaADR6y1Yq6DCRTNBX42MV7N6DcDfF1sT7CgSabA=; h=MIME-Version:From:Date:Message-ID:Subject:To:Content-Type; b=IZpwlnde677RszBLC1ouq+K/Ubp7uFvRS02o8uthtKiA0s62Qm6PUzTj3kmBdkl/3gByHsw9AqKxFtms3fP33v0lwMHKsZ9Mhu+obuZCLE/rtfRkELrR1fm/9/BnnraKPImjEwnMSxxz9Y7BVbUtxHZRNkXKzIfCPbZ1fNeNLFQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=c1EWAvzB; arc=none smtp.client-ip=209.85.210.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="c1EWAvzB" Received: by mail-ot1-f52.google.com with SMTP id 46e09a7af769-6eb7ef71c03so581194a34.0 for ; Thu, 18 Apr 2024 09:15:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1713456912; x=1714061712; darn=lists.linux.dev; h=to:subject:message-id:date:from:mime-version:from:to:cc:subject :date:message-id:reply-to; bh=VAWJsbeIDSPygX7YaLR6isLPd2p07JOTl8DsjelWL0A=; b=c1EWAvzBLbAx3y239camEJYnyeqnD3gETyXCXzeN67qNc/Fem2dVq7oTG3+86ffK7w lA10ooX9531ZBMuVqPfRedRkqHRUiHIpdFdcLScEwZrJjxmypLYRLULoTOS/NaPAKxsz EBkmS11yPSae33V3G8dSbHJ5FJjDBDeg70hY7GaEzUk80Npnf2qvmBcPGNicjX2hITCz KpLbhqB+jETLvoWKVmuHxRyd3J8SN4eEO+rLjlfOYfDKxIzia8RcSOgcpl/D6GWP3pzN 6yqHdUr1bWAsPkCJAi/vP7Z1raNUdDCnmWFdu0H8rdmQleakJGG0+cvfMCK80km8TLzH 7QrQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1713456912; x=1714061712; h=to:subject:message-id:date:from:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=VAWJsbeIDSPygX7YaLR6isLPd2p07JOTl8DsjelWL0A=; b=GnRCR4PsEl9QKVyWaoRe4752u++wztNQkQVZn46ppdPaE4paMHGXhNVOcrVKBNhXIQ rMu1CFPFXY+yN+SPOD0o9fic+HL9wYhKu1uwuDRL74eyXV8TlRR88UQipje19fbO/V6p EZPDfYjBg0mApr7CtRDhinU37PLvCJ3joRaa4j3RLkzbkNsecVO79IViNoAamDZn03jE X3P9c1ZY5Z5t/9KYtVdJHLQZrBmyNUI8wEUUc3AAa3yUvKlhQuVBcBC3m5kfYGmShuFy CfZXPQMuE8IXIub7jc8D06hD86O0bC0cMVcbqlyNEA3BvyxGV/vwFZe9EHhn7rpUnL1h izwg== X-Gm-Message-State: AOJu0Yxg/AMovIyJcYonV46WQ4ToJmeGwcUNunud3epqwpt8OpH4U0fu lwkpBKonBTkpYtXx2VjOUN+bQphI5oYmT/UgK3IheR0f0mS87qVF2iJ7Gcof4/tZXKlKECzpJ+s HyB3c4unQW6Rg0Mvb2U0EGrgc5H9zyp3P X-Google-Smtp-Source: AGHT+IG9WoTS6CA6T+P4LiuddqiFyJz0c0N9Gx5lD4u5hg/Ucy1y20EiZHQHrEnpCML7PkJHTGCD5Nho5c5mAzYpSwY= X-Received: by 2002:a05:6870:ac0c:b0:238:ffae:b5fd with SMTP id kw12-20020a056870ac0c00b00238ffaeb5fdmr2521205oab.54.1713456912677; Thu, 18 Apr 2024 09:15:12 -0700 (PDT) Precedence: bulk X-Mailing-List: dm-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: dE Date: Thu, 18 Apr 2024 21:45:01 +0530 Message-ID: Subject: Decrypting only uses 2 threads. To: dm-devel@lists.linux.dev Content-Type: text/plain; charset="UTF-8" Hi. I'm trying to encrypt some block devices and trying to use a cipher and mode which is multithreaded. I'm trying out aes-ctr-essiv:sha256 to test multithreading, but have also tried aes-xts-essiv:sha256 with the same result. The encryption is definitely multithread (massively), but while reading from the encrypted block device, I see that only 2 threads are being used. As a result when the CPU is throttled (deliberately), I see a drop in throughput while increased CPU utilization only in 2 cores. The following commands were used to setup the encryption -- cryptsetup -y -d - -c aes-ctr-essiv:sha256 --key-size 256 create disk1 /dev/sda Is there anything I can do to increase concurrency while decrypting?