From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp0 ([2001:41d0:2:c151::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms11 with LMTPS id cKKdHZzoRGBPNwAA0tVLHw (envelope-from ) for ; Sun, 07 Mar 2021 14:52:12 +0000 Received: from aspmx2.migadu.com ([2001:41d0:2:c151::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp0 with LMTPS id GCSHGZzoRGBpbAAA1q6Kng (envelope-from ) for ; Sun, 07 Mar 2021 14:52:12 +0000 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 aspmx2.migadu.com (Postfix) with ESMTPS id D3C4A1C81F for ; Sun, 7 Mar 2021 15:52:11 +0100 (CET) Received: from localhost ([::1]:47544 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lIulN-0004Dc-JY for larch@yhetil.org; Sun, 07 Mar 2021 09:52:09 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:34524) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lIulH-0004DT-88 for bug-guix@gnu.org; Sun, 07 Mar 2021 09:52:03 -0500 Received: from debbugs.gnu.org ([209.51.188.43]:55736) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lIulG-00030o-J1 for bug-guix@gnu.org; Sun, 07 Mar 2021 09:52:03 -0500 Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1lIulG-0007fs-Gs for bug-guix@gnu.org; Sun, 07 Mar 2021 09:52:02 -0500 X-Loop: help-debbugs@gnu.org Subject: bug#46981: Severe Emacs shell mode performance regression in recent Linux-libre Resent-From: Christopher Baines Original-Sender: "Debbugs-submit" Resent-CC: bug-guix@gnu.org Resent-Date: Sun, 07 Mar 2021 14:52:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 46981 X-GNU-PR-Package: guix X-GNU-PR-Keywords: To: Mark H Weaver Received: via spool by 46981-submit@debbugs.gnu.org id=B46981.161512867429446 (code B ref 46981); Sun, 07 Mar 2021 14:52:02 +0000 Received: (at 46981) by debbugs.gnu.org; 7 Mar 2021 14:51:14 +0000 Received: from localhost ([127.0.0.1]:39049 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1lIukT-0007er-KB for submit@debbugs.gnu.org; Sun, 07 Mar 2021 09:51:13 -0500 Received: from mira.cbaines.net ([212.71.252.8]:53942) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1lIukR-0007ei-Jo for 46981@debbugs.gnu.org; Sun, 07 Mar 2021 09:51:12 -0500 Received: from localhost (unknown [IPv6:2a02:8010:68c1:0:8ac0:b4c7:f5c8:7caa]) by mira.cbaines.net (Postfix) with ESMTPSA id 5D1EE27BC50; Sun, 7 Mar 2021 14:51:10 +0000 (GMT) Received: from capella (localhost [127.0.0.1]) by localhost (OpenSMTPD) with ESMTP id f3b00a34; Sun, 7 Mar 2021 14:51:09 +0000 (UTC) References: <871rcr23wr.fsf@netris.org> <87czwbisfm.fsf@netris.org> User-agent: mu4e 1.4.15; emacs 27.1 From: Christopher Baines In-reply-to: <87czwbisfm.fsf@netris.org> Date: Sun, 07 Mar 2021 14:51:05 +0000 Message-ID: <87sg57kofa.fsf@cbaines.net> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-guix@gnu.org List-Id: Bug reports for GNU Guix List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: 46981@debbugs.gnu.org Errors-To: bug-guix-bounces+larch=yhetil.org@gnu.org Sender: "bug-Guix" X-Migadu-Flow: FLOW_IN ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1615128732; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:resent-cc:resent-from:resent-sender: resent-message-id:in-reply-to:in-reply-to:references:references: list-id:list-help:list-unsubscribe:list-subscribe:list-post; bh=3aPyxYxLE5ZoI+gognj9YlEQzWVZSSMwuh5QbwQzoNo=; b=XJEz5VojpwM2zUQm/Lgqhk72ciNckUb/9kcnfZDEiIebHJ0qF54a8liMBmssvxl4MnXK+U rx4LvOEruXbhehQyekGRMsG8I7paGOt14kaohWMklWpll2/gCfYzrFi90GZSZ7rVQ1sp7W kxAphLOb53Wh3ZLppf7uFWro2ujnAu7TmikvZWQWFtsUWt2Gt2bZ4569v+grLa6dL+aJ0z mlBx7CAlcbN+YNWH5hsiVvCgC2j98Cz9pXEBMd0qd8qeEH60qDFqJIybriaRz0h1j504p8 7SRJ2T2TntAmZjAVbpNpmew5GGtC5GxJjhA8UG9ukYKmfBodatTtehXkEnoPWw== ARC-Seal: i=1; s=key1; d=yhetil.org; t=1615128732; a=rsa-sha256; cv=none; b=jeVsVc+nQbc+wUyWhj+Qbmscqwey1qEWXRK4p9T0GeJs+c1NWrm3jKLdPshxk/G+HJCtiD BrzkpNEwT6m+hM7UVDsY8YYCrK9u1kVD4f1fjfugWB9eu2MclvvRj/tH1iJ+ZRx5wO5ZUm nBBCCOXvVWYnIqTsjwSF3PLbQTFnTzXRJfCx8pZ6LogQqmcIYOT1b6JmzA7GyEyxJ+gJpq 9mDAcVFXDMvU8oK9JyTX1jPt5KbpB2XbNv/gP3Uqfp3lbNJi4QX49OAbTCmRpxberxeAeY QRx54pjFb+Jzdr+yHHDW/gUR4UBECIJXQBkQstJowwDN1PKP97J4sgQ8HtqBEA== ARC-Authentication-Results: i=1; aspmx2.migadu.com; dkim=none; dmarc=none; spf=pass (aspmx2.migadu.com: domain of bug-guix-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=bug-guix-bounces@gnu.org X-Migadu-Spam-Score: -4.47 Authentication-Results: aspmx2.migadu.com; dkim=none; dmarc=none; spf=pass (aspmx2.migadu.com: domain of bug-guix-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=bug-guix-bounces@gnu.org X-Migadu-Queue-Id: D3C4A1C81F X-Spam-Score: -4.47 X-Migadu-Scanner: scn1.migadu.com X-TUID: fhXBef4vzkL/ --=-=-= Content-Type: text/plain Mark H Weaver writes: > Mark H Weaver writes: > >> FYI, for those who use Emacs shell mode (M-x shell), I wanted to give a >> heads-up about a severe performance regression in Linux-libre 5.10.20, >> and I suspect the same regression exists in 5.11.3. >> >> For details, see the bug report I submitted to the Emacs developers, >> here: . > > I've since confirmed that reverting the two upstream commits mentioned > in fixes the performance regression. I've > attached a preliminary patch for Guix that reverts those upstream > commits for linux-libre@5.10, and which I've tested on my system. > > I guess that the same fix is also needed for linux-libre@5.11, but I've > not checked. I'll leave it to others to try applying the same reverts > to 5.11.3 if they wish, and to decide what (if anything) should be done > in Guix about this issue. Ah, thanks so much for investigating this Mark! I only got as far as asking around on #emacs. I can confirm that 5.11.3 is affected, and that reverting to 5.10.19 avoids the issue. 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