From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.proxmox.com (Postfix) with ESMTPS id 879AE7C520 for ; Fri, 15 Jul 2022 13:49:51 +0200 (CEST) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id 7E33027B5C for ; Fri, 15 Jul 2022 13:49:51 +0200 (CEST) Received: from proxmox-new.maurer-it.com (proxmox-new.maurer-it.com [94.136.29.106]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by firstgate.proxmox.com (Proxmox) with ESMTPS for ; Fri, 15 Jul 2022 13:49:50 +0200 (CEST) Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with ESMTP id 1BA7F4231C; Fri, 15 Jul 2022 13:49:50 +0200 (CEST) Message-ID: <4a05245f-6bd1-02da-f600-9976c4f1abf5@proxmox.com> Date: Fri, 15 Jul 2022 13:49:49 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:103.0) Gecko/20100101 Thunderbird/103.0 Content-Language: en-GB To: Mark Schouten , Proxmox Backup Server development discussion References: <3283c4b8-7df3-8cd8-2886-b6d14ee3633b@proxmox.com> From: Thomas Lamprecht In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-SPAM-LEVEL: Spam detection results: 0 AWL 0.004 Adjusted score from AWL reputation of From: address BAYES_00 -1.9 Bayes spam probability is 0 to 1% KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment NICE_REPLY_A -0.001 Looks like a legit reply (A) SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record T_SCC_BODY_TEXT_LINE -0.01 - Subject: Re: [pbs-devel] Scheduler causing connectivity issues? X-BeenThere: pbs-devel@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox Backup Server development discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 Jul 2022 11:49:51 -0000 Am 13/07/2022 um 12:41 schrieb Mark Schouten: > Requested=C2=A0files=C2=A0sent=C2=A0offlist. Thanks! You have 30% of runnable process getting stalled due waiting for IO, that= naturally should not cause the request accept future to get starved but i= s the reason for why it happened with the current (or better old) architecture. Increasing available memory, so that the page cache can hol= d more entries, could already relieve that system a bit. We improved on the reproducer we got locally by simulating a higher laten= cy disk using dm-delay on a small single core VM. For one we made the libpve-storage-perl do more efficient list-snapshot requests if they can be filtered by VMID, and on the PBS side we moved mo= st operations that cause IO (and are related to backup groups/snapshots) to = a separate thread pool so that the main thread should be less congested/blocked. The results got packaged and uploaded to our test repositories and are available with: - proxmox-backup-server version 2.2.4-1 - libpve-storage-perl version 7.2-7 It'd be great if you could try out those and report back if they actually= helped in your setup(s) too. cheers, Thomas