From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b="HX/cpNvg" Received: from mail-lj1-x22d.google.com (mail-lj1-x22d.google.com [IPv6:2a00:1450:4864:20::22d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 10896D6D for ; Thu, 7 Dec 2023 03:07:29 -0800 (PST) Received: by mail-lj1-x22d.google.com with SMTP id 38308e7fff4ca-2ca0f21e48cso7310551fa.2 for ; Thu, 07 Dec 2023 03:07:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1701947247; x=1702552047; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=bx4HpmYmlVXG5IQBI17IgTNCivl41HccJ/yjvncqRLw=; b=HX/cpNvgK3rkfPsfT3Ei34spV3KBZIGcC6tdBsQjVOa6U/XQt+GntwBJW8gpflvSBz 2qxvJtzidqrLH1slIygBcc76gRLkBm3nYkTSDtjWMzCSDWrhbG+lOH3LABrpJrrEQxV0 5/DEPR9BrWqRN2qi3XccACToJ/HPrx6zutDlxhZrqwOFd47oZP7AfoLc9DToWLj6fAs+ rYh4dQ4ZQcbiantGCgj8r849VZzeeiH5QQO8xH+necHPXs2k5i3FfFthKUYcnyNYZ6P4 APVAuXkcymnNi+SKXZApDdZ8BlZMcNMKycIKBQzoTkraVL9KaiVaDH/xmevkcM0BmTpK g3BA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701947247; x=1702552047; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=bx4HpmYmlVXG5IQBI17IgTNCivl41HccJ/yjvncqRLw=; b=MfvuO2cEORInbDpvi3GUYYd4l0AZ77hk/Q2LxxCvzxztvGPzIiFC+zrtAL25uoYUcb EX/A2HZ0LJ29hAgvaG1h4PiHPiQTRKNjBiz2a5Uy+9EjaaXblmofwSt/QM4cwzGyPKlR m8K49DEKpxxv8j1FMfgHdNJan/mv16sEiU0zO5IGPvyPgMNzlbqvLQCUKqEatTe4ds4X 3b5+E9kmuJrDsItU+Dfs6VDodbiqDaQh5Oo25EXNtbCJgt/h3i71Zzea5MtZ4HHSOo8g ujFxQmhx8XItiahUSQa9x9eHgihF/6hzBSbnlDv8FuCnFo9odeYQxqGOgWRFb+qi5QNc ZaGA== X-Gm-Message-State: AOJu0YxkIywpGOMnfvOoe7Ar4vEdKineMMSGxQL/yBA0fvk3nbLxDbaG btJOBD0pZ8bzXJetWRAySp1xdw== X-Google-Smtp-Source: AGHT+IH1kMq9OVqWlL29emxd9O6UUHUDw1zP942RGlfKMVI+C0S0d3kMChnjaQG+wtuPoQ2/WCKapA== X-Received: by 2002:a2e:a98d:0:b0:2ca:30f5:7e02 with SMTP id x13-20020a2ea98d000000b002ca30f57e02mr568028ljq.78.1701947247249; Thu, 07 Dec 2023 03:07:27 -0800 (PST) Received: from ?IPV6:2001:a61:13af:fb01:d424:8584:98d8:cd65? ([2001:a61:13af:fb01:d424:8584:98d8:cd65]) by smtp.gmail.com with ESMTPSA id cw17-20020a056402229100b0054cc7a4dc4csm639917edb.13.2023.12.07.03.07.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 07 Dec 2023 03:07:27 -0800 (PST) Message-ID: <604fb326-61d5-4d67-b009-649ece32a1e9@suse.com> Date: Thu, 7 Dec 2023 12:07:25 +0100 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Question regarding CDC NCM and VNC performance issue To: Francesco Dolcini , Oliver Neukum Cc: Hiago De Franco , =?UTF-8?Q?Maciej_=C5=BBenczykowski?= , davem@davemloft.net, edumazet@google.com, hiago.franco@toradex.com, kuba@kernel.org, linux-usb@vger.kernel.org, pabeni@redhat.com References: <2ce653b3-c553-457f-bcbf-9fce36f82dff@suse.com> <20231206162353.53767-1-hiagofranco@gmail.com> Content-Language: en-US From: Oliver Neukum In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 07.12.23 11:03, Francesco Dolcini wrote: > Hello Oliver and Maciej > > On Thu, Dec 07, 2023 at 10:41:51AM +0100, Oliver Neukum wrote: >> OK, you are using Linux on _both_ sides. Interesting, far from obvious, though. >> (Putting Maciej into CC) > > One more data point. If the USB host side is Windows and not Linux it > works fine. That suggests, but does not prove that the issue is on the host side. Could you post the result of "ethtool -S" after a test run? We should get statistics on the reasons for transmissions that way. Regards Oliver