From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id CEDA13858410; Mon, 30 Oct 2023 14:24:04 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org CEDA13858410 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1698675844; bh=pPqf+l+pYhHbJknNacLu7Ne65x3KDu2WytRSPRBQElA=; h=From:To:Subject:Date:In-Reply-To:References:From; b=Iwh2bWBK4P6znjiiwOn2f33wxzEiemVo90toQ+C0t5Wnsamr+TMqnS/QBUzhb+2ME rTByKfNtYPfNMomDNb9Kg7Y7jZ/JoBjt7t6NK5Y8ZzVCNq+CHST1h8Ctz9iAZtxuoI fFPQ+UwvzER2Xg4fgTvYz52nhO8SPmMXWJpxRHBU= From: "bmerry at sarao dot ac.za" To: glibc-bugs@sourceware.org Subject: [Bug string/30995] Zen 4: sub-optimal memcpy on very large copies Date: Mon, 30 Oct 2023 14:24:04 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: glibc X-Bugzilla-Component: string X-Bugzilla-Version: 2.38 X-Bugzilla-Keywords: X-Bugzilla-Severity: minor X-Bugzilla-Who: bmerry at sarao dot ac.za X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: unassigned at sourceware dot org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: security- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://sourceware.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 List-Id: https://sourceware.org/bugzilla/show_bug.cgi?id=3D30995 --- Comment #7 from Bruce Merry --- > I still think it would be better to avoid non-temporal stores for unalign= ed inputs on Zen3. As noted in comment 2, non-temporal stores for large copies have benefits t= hat won't show up in a single-threaded microbenchmark: both less pollution of t= he shared cache, and 1/3 less DRAM bandwidth (eliminates read-for-ownership). --=20 You are receiving this mail because: You are on the CC list for the bug.=