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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9EC4CC7EE23 for ; Tue, 23 May 2023 19:44:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230117AbjEWTo1 (ORCPT ); Tue, 23 May 2023 15:44:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48850 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238409AbjEWTo0 (ORCPT ); Tue, 23 May 2023 15:44:26 -0400 Received: from mail-lf1-x12e.google.com (mail-lf1-x12e.google.com [IPv6:2a00:1450:4864:20::12e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E865D132 for ; Tue, 23 May 2023 12:44:23 -0700 (PDT) Received: by mail-lf1-x12e.google.com with SMTP id 2adb3069b0e04-4f37b860173so310870e87.2 for ; Tue, 23 May 2023 12:44:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1684871062; x=1687463062; h=mime-version:user-agent:message-id:date:references:subject:cc:to :from:from:to:cc:subject:date:message-id:reply-to; bh=1Mfj/60mjyD73Y0fwFda1Tha6oubsygP6ts2VrhNkbc=; b=mYOikAlfCj8worvBWIhVLd6IXm/AHFx9xelX9M0uFZAKcUGtiVvLjoTagbJOS0MGTv b4KiXjOhYsZHxLGcUDg54qZrfuRgAvTmcj7aC2/C3lZVJKzwfewXBs/9StTWrd5wVMI9 Isy6lf4/KTrF4cz6DTCJ/p73/mVMGf9CehVA493Ao+jKUU46V2rK/MDi0zQRlIwAS9QW 9Jo81+hXYHPm7Tqxw7R9292qmhpuYi1LBE0HgDWIzbITFu4K5wF8rZoktD3f9taX90iu VqP1qSrwLPxobYOuQy2k+yAFmedLdmWjcZbX+TGopoanGfiSYMl6n8bbfr4y5hrbkK3w lgfw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684871062; x=1687463062; h=mime-version:user-agent:message-id:date:references:subject:cc:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=1Mfj/60mjyD73Y0fwFda1Tha6oubsygP6ts2VrhNkbc=; b=XDHWY4gDWPNPUEURghhX7v6yKJ80X8w1HFAtNAgCtQ964Y2uT1myoJ4gaJDK9bPLtf XqnLbTXy2XElrZ2CXDEbIkBU5fU8rZ4ALTbWgEQtKmPmTDwLvnTXBkytIJNsUxeROmvk IDWjefyUIuMEEAho95Hmp/lAbkPbzfSc+cDMTuHLmVbSNThTR1lawqRQSLTldZh91x6m TDieXXnPL8WrA46+qK3RtgBC6+2oyp8SXdctGgAg+gOafXLQAdRHjyDxUBV6tvWY6qBT Kp74IbqSiYl6lJE/mEj2FEtai6pvjYq7jJG+dhfI40qmzY/sWPAyThSIQ/XmI0g9UYfH 75Yg== X-Gm-Message-State: AC+VfDyTfaF/H96XWVpiUXPPGIsKTXqFiT8T+WXcR1enC87pNtpIYOZz MM/m75JwdO3Br+BWESdpXiI= X-Google-Smtp-Source: ACHHUZ5MPAkzkzsCp7ND/Vdo4WvJjlw8QV8CUBLYf0Th5rgBo7prOVhC6h9KOFMXYft75h0WgClnlw== X-Received: by 2002:ac2:532b:0:b0:4f3:895f:f3f8 with SMTP id f11-20020ac2532b000000b004f3895ff3f8mr4455650lfh.16.1684871061529; Tue, 23 May 2023 12:44:21 -0700 (PDT) Received: from osv.localdomain ([89.175.180.246]) by smtp.gmail.com with ESMTPSA id t15-20020ac243af000000b004f121c8beddsm1445346lfl.124.2023.05.23.12.44.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 May 2023 12:44:20 -0700 (PDT) From: Sergey Organov To: "Linux regression tracking (Thorsten Leemhuis)" Cc: Stefan Wahren , Linux regressions mailing list , Uwe =?utf-8?Q?Kleine-K=C3=B6nig?= , Fabio Estevam , Ilpo =?utf-8?Q?J=C3=A4rvinen?= , Stefan Wahren , linux-serial@vger.kernel.org, Greg Kroah-Hartman , Sascha Hauer , NXP Linux Team , Pengutronix Kernel Team , Shawn Guo , Jiri Slaby , Tomasz =?utf-8?Q?Mo=C5=84?= , Linux ARM Subject: Re: Regression: serial: imx: overrun errors on debug UART References: <2c29454b-9369-4360-8eb4-c151f59460cb@i2se.com> <9e22f237-f3ee-0415-9e6b-89a137769b8f@i2se.com> <5d59dec6-9f6f-7b20-1221-f57c94b29cca@i2se.com> <20230325151100.mskydt3hwbnspqp4@pengutronix.de> <87mt3ynsa7.fsf@osv.gnss.ru> <87sfcy8ncu.fsf@osv.gnss.ru> <534ac8db-ae8f-1ea3-9aa9-2105db7f7a52@i2se.com> <203ce87f-2898-eb10-2f8c-f237859d75e6@leemhuis.info> Date: Tue, 23 May 2023 22:44:19 +0300 Message-ID: <87ttw2vnn0.fsf@osv.gnss.ru> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org "Linux regression tracking (Thorsten Leemhuis)" writes: > Hi, Thorsten here, the Linux kernel's regression tracker. Top-posting > for once, to make this easily accessible to everyone. > > Stefan, was this regression ever solved? It doesn't look like it, but > maybe I'm missing something. > > If it wasn't solved: what needs to be done to get this rolling again? Hi Thorsten, Not Stefan, but as far as I can tell, the problem is that on Stefan's build the kernel has rather large periods of interrupts being disabled, so any attempt to decrease IRQs frequency from UART by raising FIFO IRQ threshold causes "regression" that manifests itself as missing characters on receive. I'm not sure if it's tuning FIFO level that is in fact a regression in this case. Solving this would need to identify the cause of interrupts being disabled for prolonged times, and nobody volunteered to investigate this further. One suspect, the Linux serial console, has been likely excluded already though, as not actually being in use for printk() output. -- Sergey Organov