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.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 EBD1DCCF9E3 for ; Sat, 25 Oct 2025 12:24:06 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.1151143.1481875 (Exim 4.92) (envelope-from ) id 1vCdIz-0000Po-QJ; Sat, 25 Oct 2025 12:23:33 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 1151143.1481875; Sat, 25 Oct 2025 12:23:33 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1vCdIz-0000Pg-MU; Sat, 25 Oct 2025 12:23:33 +0000 Received: by outflank-mailman (input) for mailman id 1151143; Sat, 25 Oct 2025 12:23:32 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1vCdIy-0000Pa-Gi for xen-devel@lists.xenproject.org; Sat, 25 Oct 2025 12:23:32 +0000 Received: from fhigh-b8-smtp.messagingengine.com (fhigh-b8-smtp.messagingengine.com [202.12.124.159]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 6871f739-b19d-11f0-9d16-b5c5bf9af7f9; Sat, 25 Oct 2025 14:23:30 +0200 (CEST) Received: from phl-compute-04.internal (phl-compute-04.internal [10.202.2.44]) by mailfhigh.stl.internal (Postfix) with ESMTP id 53A217A0187 for ; Sat, 25 Oct 2025 08:23:26 -0400 (EDT) Received: from phl-mailfrontend-01 ([10.202.2.162]) by phl-compute-04.internal (MEProxy); Sat, 25 Oct 2025 08:23:26 -0400 Received: by mail.messagingengine.com (Postfix) with ESMTPA for ; Sat, 25 Oct 2025 08:23:25 -0400 (EDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 6871f739-b19d-11f0-9d16-b5c5bf9af7f9 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= invisiblethingslab.com; h=cc:content-type:content-type:date:date :from:from:in-reply-to:message-id:mime-version:reply-to:subject :subject:to:to; s=fm2; t=1761395006; x=1761481406; bh=73SxmiYObq DtUnuCSzXP/l4C7MXseGGba+KsyngShX4=; b=chwpCb5K2pCAteoqX+3Q5GQyQO egCtoG67d4FNfCRpaXudtb2T/4cZ1CNCGO0SYzPT59q75pywgzT9NBn+k6rwCNhB W/Vt6uwPsei4eL0mw6OCtnR1ae0Qyd8FD4BrkjrohliLjCTdHtGX5sdl3qd36UxA 1RrXM/f3goDy64VeQ60QsJEjOAJKYhJblZMLyDCCSTZQLeHVrJxQSH5NPNrJz6tM U+WnUn1Pg8AKTJojOkVn2dJlSFcbiWO5pB9qe6kQXbXeW3UcopWm9Lg6JYOIZnCw DvcutzB9UWqE6+yVTE1t6600i0wNE8vzxVhoBPFnWi9zGuq0FU+lGAWblXSg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-type:content-type:date:date :feedback-id:feedback-id:from:from:in-reply-to:message-id :mime-version:reply-to:subject:subject:to:to:x-me-proxy :x-me-sender:x-me-sender:x-sasl-enc; s=fm2; t=1761395006; x= 1761481406; bh=73SxmiYObqDtUnuCSzXP/l4C7MXseGGba+KsyngShX4=; b=k H+v4du/GGzcvfGnkxsO5ZJHKg5xkH3btiIyMmGED+89U/mqXya1R7MRHxOvp1voA YHXGEmPE4atGJEZH6cV8DrK9C4PyDjHEP1CyWkrdTAl3guu9XGsvf4z2FEPYnFnJ bgsGI8O3npPOWIKFtYAmzthB6ewDg9qXKJKwQnHrSi0cP0FZ6QnhxKfE6sjGfQ0b LoBksB9rmWk7iVcoQXDXCHJ+GKc5lcRcnFFYMEL+eY6wH1DmZUcZn86mLUSLJwJP 0dc6LR6u7j8lly7yrF24fao48antkaoQGfIe1BNY9GQCpmhyHt/wIf72zEjI+90S 7QbM1yFv6Wd7G4yrEoEkA== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtdeggdduhedvvdduucetufdoteggodetrf dotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfurfetoffkrfgpnffqhgenuceu rghilhhouhhtmecufedttdenucenucfjughrpeffhffvuffkgggtugesghdtreertddtje enucfhrhhomhepofgrrhgvkhcuofgrrhgtiiihkhhofihskhhiqdfikphrvggtkhhiuceo mhgrrhhmrghrvghksehinhhvihhsihgslhgvthhhihhnghhslhgrsgdrtghomheqnecugg ftrfgrthhtvghrnheptddugfetudevudeiveevgfetueejlefggffghffhhfehtdfffeef gfduueegfefhnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrh homhepmhgrrhhmrghrvghksehinhhvihhsihgslhgvthhhihhnghhslhgrsgdrtghomhdp nhgspghrtghpthhtohepuddpmhhouggvpehsmhhtphhouhhtpdhrtghpthhtohepgigvnh dquggvvhgvlheslhhishhtshdrgigvnhhprhhojhgvtghtrdhorhhg X-ME-Proxy: Feedback-ID: i1568416f:Fastmail Date: Sat, 25 Oct 2025 14:23:23 +0200 From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?= To: xen-devel Subject: Slow (higher scheduling latency?) system after S3 - regression 4.17 -> 4.19 ? Message-ID: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="A1SV/O2zRZEmtWwj" Content-Disposition: inline --A1SV/O2zRZEmtWwj Content-Type: text/plain; protected-headers=v1; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Date: Sat, 25 Oct 2025 14:23:23 +0200 From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?= To: xen-devel Subject: Slow (higher scheduling latency?) system after S3 - regression 4.17 -> 4.19 ? Hi, After updating from Xen 4.17 to 4.19 it appears that I have some performance issues if system was suspended before. For now this is just vague observation, as I don't have much data yet. Generally, the user observable effect is that audio playback (over Qubes's PV audio thing) becomes very choppy, beyond usefulness (cannot make audio calls anymore, music/video playback also becomes useless with some players. For me this suggests some increased latency in scheduling - maybe some timer fires too late? This doesn't happen always, but I'd say quite often after S3, sometimes may need two or three suspend cycles to trigger the issue. But it's possible it is also some other factor, like which pCPU the VM gets scheduled on, maybe? But for now I didn't hit this issue before performing any S3. I don't have a reliable reproducer yet. While I write it's related to 4.17 -> 4.19 update, there is also slight possibility it's related to hardware change (CFL -> MTL). But, it's unlikely, since I'd probably get much more bug reports about that (the stable Qubes version uses 4.17, and we have many users on MTL). What would be the method to collect some useful debugging info? Some debug-keys (r? a?), some cmdline options? --=20 Best Regards, Marek Marczykowski-G=C3=B3recki Invisible Things Lab --A1SV/O2zRZEmtWwj Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhrpukzGPukRmQqkK24/THMrX1ywFAmj8wTsACgkQ24/THMrX 1yytNAf8CassPSpe1fiuiTOW9UxqT4+1Sc/TvSG/mYx6P+D268biE/3vqEl8Z5cW kniCZAg9uxeAoBcjM2qUPyhP0AXxg1P4A4XmGFZG4xm8pdzi+0ezBHn9NNUUg2nC O1g4dpNpSFGcYCVhl8EyzSnPWqEJaoiOOaJzp8NypM3nP1ARVxBeUJWQDtJFukRY ceDCCwEWtYP5kWnPpG0M5D4TzMJ4GDTjkYdv7QyK5rR2r3Gr3n17Cxo4uOY2bzVz 8S4bVQq8bv20ALZhxbV4pHY1a+HYj3UpDHwwKoX0EMoDsOiFLBeMJ9zcCHG0TDIA /5QIG/q7/zc2ZmbXtwsHm3/1n/Az+Q== =vgOB -----END PGP SIGNATURE----- --A1SV/O2zRZEmtWwj--