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 yI3VFQhBRGCUdQAA0tVLHw (envelope-from ) for ; Sun, 07 Mar 2021 02:57:12 +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 +V6fEQhBRGBiZAAA1q6Kng (envelope-from ) for ; Sun, 07 Mar 2021 02:57:12 +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 8197D15601 for ; Sun, 7 Mar 2021 03:57:11 +0100 (CET) Received: from localhost ([::1]:50970 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lIjbR-0002aB-Fs for larch@yhetil.org; Sat, 06 Mar 2021 21:57:09 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:35640) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lIjbK-0002Zp-0G for bug-guix@gnu.org; Sat, 06 Mar 2021 21:57:02 -0500 Received: from debbugs.gnu.org ([209.51.188.43]:55368) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lIjbJ-00067K-Ov for bug-guix@gnu.org; Sat, 06 Mar 2021 21:57:01 -0500 Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1lIjbJ-0004jZ-Nx for bug-guix@gnu.org; Sat, 06 Mar 2021 21:57:01 -0500 X-Loop: help-debbugs@gnu.org Subject: bug#46981: Severe Emacs shell mode performance regression in recent Linux-libre Resent-From: Mark H Weaver Original-Sender: "Debbugs-submit" Resent-CC: bug-guix@gnu.org Resent-Date: Sun, 07 Mar 2021 02:57:01 +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: 46981@debbugs.gnu.org Received: via spool by 46981-submit@debbugs.gnu.org id=B46981.161508577418143 (code B ref 46981); Sun, 07 Mar 2021 02:57:01 +0000 Received: (at 46981) by debbugs.gnu.org; 7 Mar 2021 02:56:14 +0000 Received: from localhost ([127.0.0.1]:38681 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1lIjaY-0004iZ-IL for submit@debbugs.gnu.org; Sat, 06 Mar 2021 21:56:14 -0500 Received: from world.peace.net ([64.112.178.59]:53560) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1lIjaX-0004iM-2j for 46981@debbugs.gnu.org; Sat, 06 Mar 2021 21:56:13 -0500 Received: from mhw by world.peace.net with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lIjaR-0007B9-5b; Sat, 06 Mar 2021 21:56:07 -0500 From: Mark H Weaver In-Reply-To: <871rcr23wr.fsf@netris.org> References: <871rcr23wr.fsf@netris.org> Date: Sat, 06 Mar 2021 21:54:42 -0500 Message-ID: <87czwbisfm.fsf@netris.org> MIME-Version: 1.0 Content-Type: text/plain 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: , Errors-To: bug-guix-bounces+larch=yhetil.org@gnu.org Sender: "bug-Guix" X-Migadu-Flow: FLOW_IN ARC-Message-Signature: i=1; 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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: -2.37 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: 8197D15601 X-Spam-Score: -2.37 X-Migadu-Scanner: scn0.migadu.com X-TUID: FiQuaOqb1SCF 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. Mark