From owner-freebsd-bugs@freebsd.org Wed Jan 25 21:26:03 2017 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 5240DCC1B7B for ; Wed, 25 Jan 2017 21:26:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 285931E7D for ; Wed, 25 Jan 2017 21:26:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v0PLQ3l4086022 for ; Wed, 25 Jan 2017 21:26:03 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 216467] [request] Hardware (SSE 4.2) CRC32C support in calculate_crc32c() Date: Wed, 25 Jan 2017 21:26:03 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: ben.rubson@gmail.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Jan 2017 21:26:03 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D216467 Bug ID: 216467 Summary: [request] Hardware (SSE 4.2) CRC32C support in calculate_crc32c() Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: ben.rubson@gmail.com Hello, Could it be possible to implement an optimized version of calculate_crc32c() with hardware CRC32C support please ? SSE 4.2 has this feature, which is really interesting. Here are some benchmarks with this : https://github.com/laanwj/crcbench On an Intel E5-2620v3 : # ./crcbench=20 CRC32C benchmarks [sw] 65543000 bytes in 69730us monotonic 69726us CPU (940.0MB/s) [hw-sse42] 65543000 bytes in 12619us monotonic 12618us CPU (5194.4MB/s) On more data (10GB) : # ./crcbench=20 CRC32C benchmarks [sw] 10485767000 bytes in 11179263us monotonic 11178667us CPU (938.0MB/s) [hw-sse42] 10485767000 bytes in 2028412us monotonic 2028305us CPU (5169.7MB= /s) Sounds really interesting and promising. Main goal behind this request is to improve iSCSI throughput when HeaderDig= est and DataDigest are enabled. Enabling these options made my iSCSI throughput drop from 300MB/s to 200MB/= s. Hardware CRC32C should then help minimising this difference. Thank you very much ! Ben --=20 You are receiving this mail because: You are the assignee for the bug.=