From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by dpdk.org (Postfix, from userid 33) id 1C9EA5689; Fri, 18 May 2018 18:01:41 +0200 (CEST) From: bugzilla@dpdk.org To: dev@dpdk.org Date: Fri, 18 May 2018 16:01:41 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: DPDK X-Bugzilla-Component: vhost/virtio X-Bugzilla-Version: 18.05 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: maxime.coquelin@redhat.com X-Bugzilla-Status: CONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: Normal X-Bugzilla-Assigned-To: dev@dpdk.org X-Bugzilla-Target-Milestone: --- 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 target_milestone Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://dpdk.org/tracker/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All MIME-Version: 1.0 Subject: [dpdk-dev] [Bug 48] Unexpected performance regression since CVE-2018-1059 fix with vector path X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 May 2018 16:01:41 -0000 https://dpdk.org/tracker/show_bug.cgi?id=3D48 Bug ID: 48 Summary: Unexpected performance regression since CVE-2018-1059 fix with vector path Product: DPDK Version: 18.05 Hardware: All OS: All Status: CONFIRMED Severity: normal Priority: Normal Component: vhost/virtio Assignee: dev@dpdk.org Reporter: maxime.coquelin@redhat.com Target Milestone: --- A small performance drop was expected with CVE-2018-1059 fix integration. While this expectation is verified for mast cases (less than 3% drop), a bi= gger drop is seen when using vector path in guest with small packets. The goal of this ticket is to see if this performance regression can be=20 improved.=20 For reference, below is a copy paste from Lei Yao mail reporting the issue: During the 18.05-rc1 performance testing, I find this patch set will bring slightly performance drop on mergeable and normal path, and big performance drop on vector path. Could you have a check on this? I know this patch is=20 important for security. Not sure if there is any way to improve the performance. Mergebale=20=20=20=20=20=20=20 packet size=20=20=20=20=20 64 0.80% 128 -2.75% 260 -2.93% 520 -2.72% 1024 -1.18% 1500 -0.65% Normal=20=20 packet size=20=20=20=20=20 64 -1.47% 128 -7.43% 260 -3.66% 520 -2.52% 1024 -1.19% 1500 -0.78% Vector=20=20 packet size=20=20=20=20=20 64 -8.60% 128 -3.54% 260 -2.63% 520 -6.12% 1024 -1.05% 1500 -1.20%=20 CPU info: Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz OS: Ubuntu 16.04 --=20 You are receiving this mail because: You are the assignee for the bug.=