From nobody Mon Apr 29 19:36:03 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; envelope-from=libvir-list-bounces@redhat.com; helo=mx1.redhat.com; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=libvir-list-bounces@redhat.com Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by mx.zohomail.com with SMTPS id 1505851288405785.9789708665622; Tue, 19 Sep 2017 13:01:28 -0700 (PDT) Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 019D568C1; Tue, 19 Sep 2017 20:01:27 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id A1FFE60BEC; Tue, 19 Sep 2017 20:01:25 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id C0C591855943; Tue, 19 Sep 2017 20:01:22 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id v8JJbkI4025492 for ; Tue, 19 Sep 2017 15:37:46 -0400 Received: by smtp.corp.redhat.com (Postfix) id 17B9F5D980; Tue, 19 Sep 2017 19:37:46 +0000 (UTC) Received: from localhost (ovpn-116-23.gru2.redhat.com [10.97.116.23]) by smtp.corp.redhat.com (Postfix) with ESMTP id A98335D97B; Tue, 19 Sep 2017 19:37:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 019D568C1 Authentication-Results: ext-mx09.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx09.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=libvir-list-bounces@redhat.com From: Eduardo Habkost To: libvir-list@redhat.com Date: Tue, 19 Sep 2017 16:37:41 -0300 Message-Id: <20170919193741.6921-1-ehabkost@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-loop: libvir-list@redhat.com Cc: Jiri Denemark Subject: [libvirt] [RFC] docs: Discourage usage of cache mode=passthrough X-BeenThere: libvir-list@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: Development discussions about the libvirt library & tools List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: libvir-list-bounces@redhat.com Errors-To: libvir-list-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Tue, 19 Sep 2017 20:01:27 +0000 (UTC) X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" Cache mode=3Dpassthrough can result in a broken cache topology if the domain topology is not exactly the same as the host topology. Warn about that in the documentation. Bug report for reference: https://bugzilla.redhat.com/show_bug.cgi?id=3D1184125 Signed-off-by: Eduardo Habkost --- docs/formatdomain.html.in | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in index 57ec2ff34..9c21892f3 100644 --- a/docs/formatdomain.html.in +++ b/docs/formatdomain.html.in @@ -1478,7 +1478,9 @@ =20
passthrough
The real CPU cache data reported by the host CPU will be - passed through to the virtual CPU.
+ passed through to the virtual CPU. Using this mode is not + recommended unless the domain CPU and NUMA topology is exa= ctly + the same as the host CPU and NUMA topology. =20
disable
The virtual CPU will report no CPU cache of the specified --=20 2.13.5 -- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list