From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 197083B29E for ; Tue, 5 Jan 2021 12:33:48 -0500 (EST) Received: by mail-pg1-x536.google.com with SMTP id z21so313191pgj.4 for ; Tue, 05 Jan 2021 09:33:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Py3TP31C8v6mu8T4FSZld9bGPoXFVFsUjOESHBtXn04=; b=U3nNWZWbg+lhc49WnV/6F6BKX4F+naOhtRyLBdkxWPV07PvBibGRSkZIGOKlxhzR+Y ARjSUz8XIv2ZQawaoThEUynH+3qNNnHO/ZnBnnT87dTcXKL1Eautc04o9c2vWipgAXlO 6g2SnMtbABT6HUXGDcOECznDWUx1VihFVllk4F+l9rEoKOEyp9s5jfm6yfFi+DTdERPN G70CeP8LGy3QvSMkPhCu/KWTlmya6U465tezF50VHaIHeMM5cMXX9elGt52L9IlokkrS v3jlT8oscESZwXbsW19kYEzp4/kkrd0ye6Di7CDXWXJs/vyv3AmYUQhoTwefU10kOCZn UXKA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Py3TP31C8v6mu8T4FSZld9bGPoXFVFsUjOESHBtXn04=; b=mwBQcxYjMiNsQSNs8Sw0JDk/kn/Jz0s6ark3iai/7YXrNmPY4Y+nUgzh/OwFIbUMea J+lF4c8hAa9p34lo6RcHH3SkRssV1+/NSS43QvuuBPLTzOYVY2bgAl2/nLdUuetNtrof Yk4/jHvI33ap29plw4OTKWfKMcAD+EpI69cIzSNY4zqiPZu00drozDK9QqTn1VBTMHLo vy7Zo8dDDK16DjTIIwx852+2QTxYqRmVFUfAw17+3d/Mq9VvqYE7su7wiwoYrCPf+OUl 7LaiesjECcXm7VHC4O5dkibgDOfvopDjjGZNOzXy78hYbWadKcSr8Ki6xM+qKBAFPGqK VZJw== X-Gm-Message-State: AOAM530qpxbFfWckLwmdxnOeCNTCqWvc0voM03jIPst2oTqSXXJy+0ln BRzseynAhDYi4UzDqVhVeSow1Q== X-Google-Smtp-Source: ABdhPJxEa7uJQ6JX5pVqvna7G0PGxO+symP/rykZt1jDZN6iazufnm73JyOyxdTeDQ1Xbdf2a9fq3A== X-Received: by 2002:aa7:9ec5:0:b029:19e:bfaf:1b24 with SMTP id r5-20020aa79ec50000b029019ebfaf1b24mr482048pfq.51.1609868027199; Tue, 05 Jan 2021 09:33:47 -0800 (PST) Received: from hermes.local (204-195-22-127.wavecable.com. [204.195.22.127]) by smtp.gmail.com with ESMTPSA id p22sm409767pgk.21.2021.01.05.09.33.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Jan 2021 09:33:46 -0800 (PST) Date: Tue, 5 Jan 2021 09:33:33 -0800 From: Stephen Hemminger To: Daniel Sterling Cc: Michael Richardson , bloat Message-ID: <20210105093333.3dc8789e@hermes.local> In-Reply-To: References: <20210104205501.52a0ed46@hermes.local> <29119.1609863018@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: Re: [Bloat] Openwrt stability? X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Jan 2021 17:33:48 -0000 On Tue, 5 Jan 2021 11:49:58 -0500 Daniel Sterling wrote: > On Tue, Jan 5, 2021 at 11:10 AM Michael Richardson wrote: > > > > Stephen Hemminger wrote: > > > Any idea how to debug this? Is there a way to get serial console? > > > > It depends upon your device, but in most cases, open the case, find the pins, > > attach USB/TTL interface. Some newish devices (Turris MOX, for instance), > > annoyingly need 1.8V TTL interfaces, which are harder to find and more > > expensive. ($20 vs $3) > > Best option may be to just buy better supported hardware :) > > I've been running openwrt on a small mobile-class PC (sandy bridge > celeron) and then just using stock UBNT SOHO (amplifi HD) access > points for the wifi itself. This is working rather well. The amplifi > units have buffers that are too big but that's mitigated on the > openwrt side with cake It is Linksys WRT3200ACM which seemed the best at the time. Did get the problem down to one device on home network is doing something that causes crash. It happens now about 20sec after startup. I suspect a kernel bug and magic bad packet (fragmentation?).