From owner-freebsd-virtualization@freebsd.org Tue May 18 16:16:50 2021 Return-Path: Delivered-To: freebsd-virtualization@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id EA3C9650FD7 for ; Tue, 18 May 2021 16:16:50 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (mailman.nyi.freebsd.org [IPv6:2610:1c1:1:606c::50:13]) by mx1.freebsd.org (Postfix) with ESMTP id 4Fl1NL66MPz3CYt for ; Tue, 18 May 2021 16:16:50 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id CFFEA651056; Tue, 18 May 2021 16:16:50 +0000 (UTC) Delivered-To: virtualization@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id CFC8F65116A for ; Tue, 18 May 2021 16:16:50 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (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 "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Fl1NL5SCqz3CLS for ; Tue, 18 May 2021 16:16:50 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (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 did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id A0298229A5 for ; Tue, 18 May 2021 16:16:50 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 14IGGoNT056957 for ; Tue, 18 May 2021 16:16:50 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 14IGGoZn056956 for virtualization@FreeBSD.org; Tue, 18 May 2021 16:16:50 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 254513] virtio_random: random_harvestq spinning on a CPU with Q35 virtio random device Date: Tue, 18 May 2021 16:16:50 +0000 X-Bugzilla-Reason: AssignedTo CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: misc X-Bugzilla-Version: 13.0-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: deltatux@kwokinator.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: virtualization@FreeBSD.org 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: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-virtualization@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: "Discussion of various virtualization techniques FreeBSD supports." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 18 May 2021 16:16:51 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D254513 deltatux@kwokinator.com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |deltatux@kwokinator.com --- Comment #5 from deltatux@kwokinator.com --- Just wanted to chime in that I have been experiencing the same issue as wel= l, it looks like this issue may be more widespread, I found someone writing ab= out this issue while trying to research a workaround for this problem: https://decomo.info/wiki/en/blog/2021/2021-05-02 I tried applying the workaround as suggested in this bug report by blacklis= ting virtio_random in rc.conf and it appears to be working, random_harvestq is no longer eating up 1 of my VM cores. However, I'm not sure what the impact is for blacklisting virtio_random... --=20 You are receiving this mail because: You are the assignee for the bug. You are on the CC list for the bug.=