From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr1-x42c.google.com (mail-wr1-x42c.google.com [IPv6:2a00:1450:4864:20::42c]) (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 403793B29E for ; Sat, 7 Nov 2020 12:01:07 -0500 (EST) Received: by mail-wr1-x42c.google.com with SMTP id k2so1078542wrx.2 for ; Sat, 07 Nov 2020 09:01:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=creamfinance.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version; bh=85Yc4A3bKuyGGNQJv8/SzUdQXfylw+7zOzYwCODxD2Y=; b=SQCca3k/b8ouE7TUQkNL6/KJf4l8hT6bT2zgxIxAcL+siqBig/3uKL4yGYa8swe8iB 2R8vu5Xqqzu8h3qp84F2E3Z6M1QkzvQ6u+o0h6wcf1y+veENAJSDz9EQze1SgIPB1DLy nMD6ocT2/fYNlRVy+5AVHlCZI0iLnw7gYCd2o= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version; bh=85Yc4A3bKuyGGNQJv8/SzUdQXfylw+7zOzYwCODxD2Y=; b=mjQV9fBj7WXWbtL566uoMQo2G+qGcQw2YFoiHvKIuK6eLOjcVUZtjaduYKs0tTuixS IEToWbLZ0KZRkXcug3sU/BJiBtpcmwiRmpQV0DydjG+ps1Yoi2qAqlThXxO1vTSiGCgn bVH5DoDBHgwGQN0R5C/5njwzNnFusGs6elN+wRNAe3AStPbd+b5Sd6MX8+1OxiP8pI9b qnlDR3bjCBcLpKugWJ5EzCZ300Vyrah9p/0M/tGZw+v6o6QYI4KCu8F88Z+0Z+InwhJN cvd3OdJAaAq4HK38pD+v7kfP602he6+oNyr0dz31iPbqKqqqhGsVxv0QmMJ9YSuZAHqA YMIA== X-Gm-Message-State: AOAM530pwbrN4I4V0UVM7g10gmlsrQJjcrIJ+zCQLrvsnYRtwmUhzfr+ Gl/UM5Fcs9P/2/wSKzMewFHZ X-Google-Smtp-Source: ABdhPJwuD1DM5NJpEqgAmqDlMgQf1m/b0X7/L/+QkVOdg+75yJpemh3DSDSZkF5kXoTmnklLz1tPQw== X-Received: by 2002:a5d:5048:: with SMTP id h8mr8888456wrt.135.1604768466033; Sat, 07 Nov 2020 09:01:06 -0800 (PST) Received: from [10.8.100.3] (ip-185.208.132.9.cf-it.at. [185.208.132.9]) by smtp.gmail.com with ESMTPSA id s202sm6978174wme.39.2020.11.07.09.01.05 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 07 Nov 2020 09:01:05 -0800 (PST) From: "Thomas Rosenstein" To: "Jesper Dangaard Brouer" Cc: Bloat Date: Sat, 07 Nov 2020 18:01:03 +0100 X-Mailer: MailMate (1.13.2r5673) Message-ID: In-Reply-To: <20201107174623.73f91841@carbon> References: <87imalumps.fsf@toke.dk> <871rh8vf1p.fsf@toke.dk> <81ED2A33-D366-42FC-9344-985FEE8F11BA@creamfinance.com> <87sg9ot5f1.fsf@toke.dk> <20201105143317.78276bbc@carbon> <11812D44-BD46-4CA4-BA39-6080BD88F163@creamfinance.com> <20201106121840.7959ae4b@carbon> <87blgaso84.fsf@toke.dk> <20201106135358.09f6c281@carbon> <20201106151324.5f506574@carbon> <1E70B6D2-1212-43FA-989A-03B657EEE2F2@creamfinance.com> <20201106211940.4c30ccc9@carbon> <20201107174623.73f91841@carbon> MIME-Version: 1.0 Content-Type: text/plain; format=flowed; markup=markdown Subject: Re: [Bloat] Router congestion, slow ping/ack times with kernel 5.4.60 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: Sat, 07 Nov 2020 17:01:07 -0000 On 7 Nov 2020, at 17:46, Jesper Dangaard Brouer wrote: > > Did the latency issue happen during this this perf recording? > (it is obviously important that you record during the issue) yes it was recorded during the transfer, while it exhibited the issue I let the transfer run some time, then did the perf extract, stopped the transfer afterwards. > > Finding a single latency event/issue in perf.data is like looking in > for needle in a haystack. It does give hints and e.g. tell me details > like what part of the kernel are used/activated. > > I can see that you have likely configured XPS (Transmit Packet > Steering). Is this on purpose? Not on purpose, I assume it comes from the Mellanox Card. > > -- > Best regards, > Jesper Dangaard Brouer > MSc.CS, Principal Kernel Engineer at Red Hat > LinkedIn: http://www.linkedin.com/in/brouer