From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5A255C3DA6E for ; Wed, 3 Jan 2024 12:20:17 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rL0Ds-0002jr-FF; Wed, 03 Jan 2024 07:19:48 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rL0Dp-0002jT-Ua for qemu-devel@nongnu.org; Wed, 03 Jan 2024 07:19:46 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rL0Dm-0006Av-Gs for qemu-devel@nongnu.org; Wed, 03 Jan 2024 07:19:44 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1704284381; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=4vzcw7xKNK6mWrMTxaU+BLH5+QWHgnxCjT8dTJ2P8XA=; b=OP8XNjhx3dsDKBhNoxNJHd7XAH3T9JqgrYdMsNrP8qKF1rU3SjFT6CjU25yFeq6DPc3j6v Q0uZlWln6LNAfwXaAqR7AmXRW8auu5TySDJ88Nz4hC8WuzVnFS7Y7zsNSvo5aXqZQCOhjH IQ0Vsdhrmzf04IR3dxhSiqcWne54LE4= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-160-pqAC7zpGMXuswRKPanPDIQ-1; Wed, 03 Jan 2024 07:19:39 -0500 X-MC-Unique: pqAC7zpGMXuswRKPanPDIQ-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 6CE9C185A784; Wed, 3 Jan 2024 12:19:39 +0000 (UTC) Received: from redhat.com (unknown [10.42.28.117]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 5D02251D5; Wed, 3 Jan 2024 12:19:37 +0000 (UTC) Date: Wed, 3 Jan 2024 12:19:35 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Fiona Ebner Cc: qemu-devel@nongnu.org, pbonzini@redhat.com, sw@weilnetz.de, t.lamprecht@proxmox.com Subject: Re: [PATCH v2] qemu_init: increase NOFILE soft limit on POSIX Message-ID: References: <20231218101340.35053-1-f.ebner@proxmox.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20231218101340.35053-1-f.ebner@proxmox.com> User-Agent: Mutt/2.2.10 (2023-03-25) X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.5 Received-SPF: pass client-ip=170.10.133.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -46 X-Spam_score: -4.7 X-Spam_bar: ---- X-Spam_report: (-4.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-2.601, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Mon, Dec 18, 2023 at 11:13:40AM +0100, Fiona Ebner wrote: > In many configurations, e.g. multiple vNICs with multiple queues or > with many Ceph OSDs, the default soft limit of 1024 is not enough. > QEMU is supposed to work fine with file descriptors >= 1024 and does > not use select() on POSIX. Bump the soft limit to the allowed hard > limit to avoid issues with the aforementioned configurations. > > Of course the limit could be raised from the outside, but the man page > of systemd.exec states about 'LimitNOFILE=': > > > Don't use. > > [...] > > Typically applications should increase their soft limit to the hard > > limit on their own, if they are OK with working with file > > descriptors above 1023, > > If the soft limit is already the same as the hard limit, avoid the > superfluous setrlimit call. This can avoid a warning with a strict > seccomp filter blocking setrlimit if NOFILE was already raised before > executing QEMU. > > Buglink: https://bugzilla.proxmox.com/show_bug.cgi?id=4507 > Signed-off-by: Fiona Ebner > --- Reviewed-by: Daniel P. Berrangé With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|