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 X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5BA8EC64E8A for ; Mon, 30 Nov 2020 14:48:48 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [63.128.21.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A0D7F207FF for ; Mon, 30 Nov 2020 14:48:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A0D7F207FF Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=tempfail smtp.mailfrom=dm-devel-bounces@redhat.com Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-246-izr7cL69O3mrY_UYZp4nFg-1; Mon, 30 Nov 2020 09:48:43 -0500 X-MC-Unique: izr7cL69O3mrY_UYZp4nFg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 1D6A5612AA; Mon, 30 Nov 2020 14:48:38 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 443235C1A1; Mon, 30 Nov 2020 14:48:37 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id 37945180954D; Mon, 30 Nov 2020 14:48:35 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id 0AUEmXg3018801 for ; Mon, 30 Nov 2020 09:48:33 -0500 Received: by smtp.corp.redhat.com (Postfix) id 09B322166B2D; Mon, 30 Nov 2020 14:48:33 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast06.extmail.prod.ext.rdu2.redhat.com [10.11.55.22]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0537E2166B2C for ; Mon, 30 Nov 2020 14:48:30 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 96FC01875045 for ; Mon, 30 Nov 2020 14:48:30 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-593-kf1Eh7a1NYyXvxDzY5QhZQ-1; Mon, 30 Nov 2020 09:48:28 -0500 X-MC-Unique: kf1Eh7a1NYyXvxDzY5QhZQ-1 Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kjkTa-0002M9-6L for dm-devel@redhat.com; Mon, 30 Nov 2020 14:48:26 +0000 Date: Mon, 30 Nov 2020 14:48:26 +0000 From: Matthew Wilcox To: dm-devel@redhat.com Message-ID: <20201130144826.GC4327@casper.infradead.org> MIME-Version: 1.0 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-loop: dm-devel@redhat.com Subject: [dm-devel] Slow write speeds on new laptop X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I just got a Tiger Lake based laptop and installed Debian on it with dm-crypt. The installer attempts to write zeroes to the encrypted partition in order to prevent various metadata attacks (using blockdev-wipe [1]) After about eight hours with it not even halfway, I aborted this attempt. The drive is about a terabyte in size, so that's around 15MB/s. This is atrocious! cryptsetup benchmark says the CPU is capable of doing 4GB/s with aes-xts and a 512b key. The cipher in use is reported as aes-xts-plain64. dd iflag=direct of=/dev/null bs=64k count=100000 gives some pretty poor results. with if=/dev/nvme0n1p3, I get 1.2GB/s. with if=/dev/dm-0, I get 600MB/s. I found this critique of the dm-crypt architecture: https://blog.cloudflare.com/speeding-up-linux-disk-encryption/ I'm using Linux 5.9, and I'm not sure how much of this has been incorporated. [1] https://salsa.debian.org/installer-team/partman-crypto/-/blob/master/blockdev-wipe/blockdev-wipe.c -- dm-devel mailing list dm-devel@redhat.com https://www.redhat.com/mailman/listinfo/dm-devel