From nobody Thu Jul 31 15:28:28 2025 X-Original-To: virtualization@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4btCf50CwWz63xZm for ; Thu, 31 Jul 2025 15:28:29 +0000 (UTC) (envelope-from ivy@freebsd.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2610:1c1:1:6074::16:84]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "freefall.freebsd.org", Issuer "R11" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4btCf46kLRz3M6c for ; Thu, 31 Jul 2025 15:28:28 +0000 (UTC) (envelope-from ivy@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1753975708; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type; bh=JgBb38Wizv+iS26+ofHHq07NqYoPublUyGio4FTycTU=; b=aKOCuQOZH14LFBTgf6uqhSHUFORbkIc7mBHEaA4meUZGfeFCVNZkHNKpgJoLLAC7+vwMdw JQf0RBHmIGXJcInJoAKhul6Guw5V4Csy0Fk+nG2tqvtQshqdvZ6LFdhbvO2aHP2otLAS/6 ohjUYW3Z/BNkBbtixgtaBx5/e/aE2oiNUtraKW4X3ZIbLoi2HVL0T/2QAuBwYqfvivL4i1 GypeDHDAdnqvpmElyPSsTxwAieD2La8dZz9jieYvNbjD56BtUAt45qDqwW8cOH0SX6TtIn nowQKRROFojzmHeJ/Cm98EMcy6wWKX4bKzTXzw6+ZeuJYGWLnn6vLe2nLKQ7LA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1753975708; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type; bh=JgBb38Wizv+iS26+ofHHq07NqYoPublUyGio4FTycTU=; b=RFBDy31EPPVMxh9TzkolYEcSHDYdoR2BYwA3lL3+lzPKJ31YeLMf7ehBDT1DZgsQ9kDQK9 y8gXTOAh+cO0xD+plWeUmMnY2WPlCR96QIjOTXGlBK1Y6xksI/n8t5RaGcJH0CAFoZZlJF +BHcuDWotIKLvDyQzzlpqsclWRNJx2WuhexOmewIQuiOuh7lStM8pLo3xPzmQWj6hNtVV5 PUKf2eyy729lD2NMnmYjcZaASAKW0jCww6b9y8DGQPnmlvRsdM2/hYIOhZlNoj8x/vz4JQ n8xiXsXyjvsWVlaNbI6Dw/XtUMIufQpiNwlA6tEzMZR2Qk2fwIPcLB1j5Leqkg== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1753975708; a=rsa-sha256; cv=none; b=eNAeNohPNN6aldxqY/BuPxdJ0I61L/0jlrL329547tPL3ZH+pE6yuEWpjsqJ31VDlK9wnA KuGxcljTC347cCYEE//6y0A19qvrP1P7PDksajWwk3tjMhbQKakYJsYbwCCzhpk2R50ctk 94zo9WfHWqsmlrmjYxNRHr7fJ2DckEm8P4JCM6nVHQxebkcveYWY349zWiSWh4uQbzffBB wBJbvUPmUwPK+eb141kW4zecFUqKT0QuPwbbT7BIy6Hue2lxFdmQ+Xm4UaIyrFvdk7bDJK A47+fAXQeiDgSyrs9erLCgR0wseDQyUZ8OwMi/glR2ewEtqqrGl5S8YfRJhkAQ== Received: by freefall.freebsd.org (Postfix, from userid 1532) id CBB4826CE1; Thu, 31 Jul 2025 15:28:28 +0000 (UTC) Date: Thu, 31 Jul 2025 16:28:28 +0100 From: Lexi Winter To: virtualization@freebsd.org Subject: how do i make a bhyve guest pick up the bhyve CPU topology? Message-ID: List-Id: Discussion List-Archive: https://lists.freebsd.org/archives/freebsd-virtualization List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-virtualization@freebsd.org Sender: owner-freebsd-virtualization@FreeBSD.org MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="BJL8z7I7BsWChwWf" Content-Disposition: inline --BJL8z7I7BsWChwWf Content-Type: text/plain; charset=us-ascii Content-Disposition: inline hello, i have a VM host with a CPU: CPU: Intel(R) Xeon(R) E E-2468 (2611.20-MHz K8-class CPU) HTT is disabled in the BIOS, so this shows up on the host as 1 socket x 8 cores: FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs FreeBSD/SMP: 1 package(s) x 8 core(s) now i start a bhyve VM with '-c 2', but the VM does not pick up the expected topology (2 sockets x 1 core x 1 thread), instead it decides to enable HTT: FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs FreeBSD/SMP: 1 package(s) x 1 core(s) x 2 hardware threads if i force bhyve to set a particular topology, e.g. with '-c 2,sockets=2,cores=1,threads=1' then the guest still does not pick up the correct topology, but it does log some exciting new messages: WARNING: L1 data cache covers fewer APIC IDs than a core (0 < 1) WARNING: L2 data cache covers fewer APIC IDs than a core (0 < 1) WARNING: L3 data cache covers fewer APIC IDs than a core (0 < 1) FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs FreeBSD/SMP: 1 package(s) x 1 core(s) x 2 hardware threads this is using main ~29af6d2e2ec9fe8df7cf1e1a0bf3597028831b18 on amd64. does anyone have an idea what's going on here or how i can fix it? --BJL8z7I7BsWChwWf Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQSyjTg96lp3RifySyn1nT63mIK/YAUCaIuLmAAKCRD1nT63mIK/ YIn1AQCcBNtV2BkbXnk5RqJ2pBXKxZD7eu9uPRrUgds3eCLQggEA+6vF6VDZWpbR U5YaC0IX9kid+8RO/leECdCmfeZIwAk= =1z0H -----END PGP SIGNATURE----- --BJL8z7I7BsWChwWf--