From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 6C80146D79; Wed, 20 Aug 2025 14:23:51 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 028A64065C; Wed, 20 Aug 2025 14:23:51 +0200 (CEST) Received: from inbox.dpdk.org (inbox.dpdk.org [95.142.172.178]) by mails.dpdk.org (Postfix) with ESMTP id 7AF18402CC for ; Wed, 20 Aug 2025 14:23:50 +0200 (CEST) Received: by inbox.dpdk.org (Postfix, from userid 33) id 6306546D7A; Wed, 20 Aug 2025 14:23:50 +0200 (CEST) From: bugzilla@dpdk.org To: dev@dpdk.org Subject: [DPDK/other Bug 1775] rte_hash performs poorly with small key sizes Date: Wed, 20 Aug 2025 12:23:50 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: DPDK X-Bugzilla-Component: other X-Bugzilla-Version: 25.07 X-Bugzilla-Keywords: X-Bugzilla-Severity: minor X-Bugzilla-Who: mattias.ronnblom@ericsson.com X-Bugzilla-Status: UNCONFIRMED 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: multipart/alternative; boundary=17556926300.0478A.1313131 Content-Transfer-Encoding: 7bit X-Bugzilla-URL: https://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All MIME-Version: 1.0 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org --17556926300.0478A.1313131 Date: Wed, 20 Aug 2025 14:23:50 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All https://bugs.dpdk.org/show_bug.cgi?id=3D1775 Bug ID: 1775 Summary: rte_hash performs poorly with small key sizes Product: DPDK Version: 25.07 Hardware: All OS: All Status: UNCONFIRMED Severity: minor Priority: Normal Component: other Assignee: dev@dpdk.org Reporter: mattias.ronnblom@ericsson.com Target Milestone: --- uses memcmp() to compare key sizes < 16 bytes. memcmp() is often not a compiler intrinsic (e.g., not on GCC), and thus each comparison will result in an expensive libc call (both function call overhe= ad and the byte-scanning required by memcmp). memcmp() should preferably never be used for a pure boolean comparison. --=20 You are receiving this mail because: You are the assignee for the bug.= --17556926300.0478A.1313131 Date: Wed, 20 Aug 2025 14:23:50 +0200 MIME-Version: 1.0 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.dpdk.org/ Auto-Submitted: auto-generated X-Auto-Response-Suppress: All

Bug ID	1775
Summary	rte_hash performs poorly with small key sizes
Product	DPDK
Version	25.07
Hardware	All
OS	All
Status	UNCONFIRMED
Severity	minor
Priority	Normal
Component	other
Assignee	dev@dpdk.org
Reporter	mattias.ronnblom@ericsson.com
Target Milestone	---

<rte_hash.h> uses memcmp() t=
o compare key sizes < 16 bytes.

memcmp() is often not a compiler intrinsic (e.g., not on GCC), and thus each
comparison will result in an expensive libc call (both function call overhe=
ad
and the byte-scanning required by memcmp).

memcmp() should preferably never be used for a pure boolean comparison.

You are receiving this mail because:

You are the assignee for the bug.

=20=20=20=20=20=20=20=20=20=20

= --17556926300.0478A.1313131--