From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 2EAD8385840D; Wed, 25 Oct 2023 12:50:31 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2EAD8385840D DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1698238231; bh=bgeHIjZGwZR2v8MEscwIZqOTDskAhsz2pjnMiAFkQkQ=; h=From:To:Subject:Date:In-Reply-To:References:From; b=aq7HufJbXz6ENIf6Tn2Rwc2TK0LE7kOsjwmXJibb00WUc5cEdxqWwRvwi/ZRnzET4 hPBJDNQ6jqvvnBQlSzsb88OROFvs39SKFtGu8lzxUVuZU1aPVn9EuSJHf8X3pGUxcs XbqcOoVWCAJcQy1vAedLCOHP3OMvuXGvY25/93Zk= From: "fweimer at redhat dot com" To: glibc-bugs@sourceware.org Subject: [Bug string/30995] Zen 4: sub-optimal memcpy on very large copies Date: Wed, 25 Oct 2023 12:50:30 +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: fweimer at redhat dot com 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: X-Bugzilla-Changed-Fields: cc 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 Florian Weimer changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |fweimer at redhat dot com --- Comment #2 from Florian Weimer --- This is likely a trade-off between whole-system performance and single-thread/single-process performance. To avoid evicting higher-level, shared cashes, it is usually beneficial to switch from REP MOVSB to non-temporal stores at a certain point even though it impacts single-thread performance. --=20 You are receiving this mail because: You are on the CC list for the bug.=