From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 8BABC3858C2B; Fri, 27 Oct 2023 13:16:01 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 8BABC3858C2B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1698412561; bh=7V/39V2WqJabPeU4lALf8soEFLP/rnJDz7RijEGGsfk=; h=From:To:Subject:Date:In-Reply-To:References:From; b=ZlsR2Tt1HWK0DqhR/FfSKDAN8andr9LFN190Sbos6EOwKuLNAZN7KOMgX5tbrpzQ4 ABatSt7qZWKgQIqyFOh7+dXbSmZ7x3lFi/rmkQ4uu6SjwHNpc4TU71GiCh/2nb0KE6 pPQDOcJ52pDfjhbwHnrEkUCkFJVBXguQjJUzquFo= From: "bmerry at sarao dot ac.za" To: glibc-bugs@sourceware.org Subject: [Bug string/30994] REP MOVSB performance suffers from page aliasing on Zen 4 Date: Fri, 27 Oct 2023 13:16:01 +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=3D30994 --- Comment #8 from Bruce Merry --- Ah looks like the GLIBC_TUNABLES environment variable didn't appear in the output. Let me try again: + ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 0 -r5 80.6649 GB/s + ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 0 0 2 4 6 8 10 12 14= 16 18 20 22 -r5 954.928 GB/s + ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 0 0 1 2 3 4 5 6 7 8 = 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 -r5 1883.1 GB/s + ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 0 -r5 48.7753 GB/s + ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 0 0 2 4 6 8 10 12 = 14 16 18 20 22 -r5 570.385 GB/s + ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 0 0 1 2 3 4 5 6 7 = 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 -r5 676.928 GB/s + ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 15 -r5 3.54696 GB/s + ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 15 0 2 4 6 8 10 12 1= 4 16 18 20 22 -r5 42.5706 GB/s + ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 15 0 1 2 3 4 5 6 7 8= 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 -r5 85.0753 GB/s + ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 15 -r5 3.50689 GB/s + ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 15 0 2 4 6 8 10 12= 14 16 18 20 22 -r5 41.5237 GB/s + ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 15 0 1 2 3 4 5 6 7= 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 -r5 81.8951 GB/s + GLIBC_TUNABLES=3Dglibc.cpu.x86_rep_movsb_threshold=3D1000000 + ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 0 -r5 102.05 GB/s + GLIBC_TUNABLES=3Dglibc.cpu.x86_rep_movsb_threshold=3D1000000 + ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 0 0 2 4 6 8 10 12 14= 16 18 20 22 -r5 1206.81 GB/s + GLIBC_TUNABLES=3Dglibc.cpu.x86_rep_movsb_threshold=3D1000000 + ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 0 0 1 2 3 4 5 6 7 8 = 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 -r5 2415.47 GB/s + GLIBC_TUNABLES=3Dglibc.cpu.x86_rep_movsb_threshold=3D1000000 + ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 0 -r5 49.4859 GB/s + GLIBC_TUNABLES=3Dglibc.cpu.x86_rep_movsb_threshold=3D1000000 + ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 0 0 2 4 6 8 10 12 = 14 16 18 20 22 -r5 583.279 GB/s + GLIBC_TUNABLES=3Dglibc.cpu.x86_rep_movsb_threshold=3D1000000 + ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 0 0 1 2 3 4 5 6 7 = 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 -r5 1066.54 GB/s + GLIBC_TUNABLES=3Dglibc.cpu.x86_rep_movsb_threshold=3D1000000 + ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 15 -r5 97.1753 GB/s + GLIBC_TUNABLES=3Dglibc.cpu.x86_rep_movsb_threshold=3D1000000 + ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 15 0 2 4 6 8 10 12 1= 4 16 18 20 22 -r5 991.128 GB/s + GLIBC_TUNABLES=3Dglibc.cpu.x86_rep_movsb_threshold=3D1000000 + ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 15 0 1 2 3 4 5 6 7 8= 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 -r5 2257.42 GB/s + GLIBC_TUNABLES=3Dglibc.cpu.x86_rep_movsb_threshold=3D1000000 + ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 15 -r5 49.3362 GB/s + GLIBC_TUNABLES=3Dglibc.cpu.x86_rep_movsb_threshold=3D1000000 + ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 15 0 2 4 6 8 10 12= 14 16 18 20 22 -r5 571.026 GB/s + GLIBC_TUNABLES=3Dglibc.cpu.x86_rep_movsb_threshold=3D1000000 + ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 15 0 1 2 3 4 5 6 7= 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 -r5 1075.03 GB/s --=20 You are receiving this mail because: You are on the CC list for the bug.=