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 B67BFC433F5 for ; Mon, 10 Jan 2022 11:23:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244657AbiAJLXU (ORCPT ); Mon, 10 Jan 2022 06:23:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47442 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239620AbiAJLXO (ORCPT ); Mon, 10 Jan 2022 06:23:14 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A0C2FC06173F for ; Mon, 10 Jan 2022 03:23:14 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 3894C61248 for ; Mon, 10 Jan 2022 11:23:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id A2912C36AE3 for ; Mon, 10 Jan 2022 11:23:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1641813793; bh=XF9k2IxAwLzPpDMztQ+PNoekO+KHCwP0adIDnntBq+w=; h=From:To:Subject:Date:From; b=OArZJ/qkWQjvD+Ony8KGA2z5DtqdbKUzsql1lHlUquM+hC1qHVsPnGYzJm4H/KHEd fVhJtPxfn2F3fmiY0dJ5dBoYrJUUhjaaM00tFeb9VVohsQnN2fnD3lI8gBpKcbiKTL zvdrGQ9WtACWB3gbZKwhInIciR9I1p5QuB1ZczSvC4uXAUMawCNCZMrA4Zuw0INU2H a2TlgtnF4IpoSeL4EytI9CzfxuT8plps2bVP66ZJK+CcCZeKth9uVTv7zTG7C4aFYd mPisN5jTfUg4pLrr7B/rrnlMpdGjEu9LI08lnOBg/VMwq1qukq//+VtLZpHxSDVIuB drqAXU+17BSvg== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 80275C05FE3; Mon, 10 Jan 2022 11:23:13 +0000 (UTC) From: bugzilla-daemon@bugzilla.kernel.org To: linux-usb@vger.kernel.org Subject: [Bug 215475] New: RMNET data connection speed would be reduced to about 80-100Mb/s from 150Mb/s if try to re-connect it Date: Mon, 10 Jan 2022 11:23:13 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: AssignedTo drivers_usb@kernel-bugs.kernel.org X-Bugzilla-Product: Drivers X-Bugzilla-Component: USB X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: slark_xiao@163.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: drivers_usb@kernel-bugs.kernel.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version cf_kernel_version rep_platform op_sys cf_tree bug_status bug_severity priority component assigned_to reporter cf_regression attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org https://bugzilla.kernel.org/show_bug.cgi?id=3D215475 Bug ID: 215475 Summary: RMNET data connection speed would be reduced to about 80-100Mb/s from 150Mb/s if try to re-connect it Product: Drivers Version: 2.5 Kernel Version: 5.13.0 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: USB Assignee: drivers_usb@kernel-bugs.kernel.org Reporter: slark_xiao@163.com Regression: No Created attachment 300251 --> https://bugzilla.kernel.org/attachment.cgi?id=3D300251&action=3Dedit iperf test result We have a Qualcomm modem device which support MBIM and RMNET over USB. For RMNET, the download-link speed would be reduced to 80 Mb/s if re-conn= ect it once. The expected speed should be 150 Mb/s. Test step as below: 1. Switch device to RMNET USB composition. 2. Connect it to host PC(kernel 5.13). 3. Start a data connection with nmcli related settings. 4. Start a iperf test with simulated network(CMW500). Test result is about 145 Mb/s ,and protocol is TCP. 5. Disconnect the connection by turning off the signal, setting AT+CFUN= =3D0=EF=BC=8C or deleting the data connection in the host. 6. Re-connect it again. 7. The TCP iperf test could only reach to about 80-100Mb/s. This issue can not reproduced with MBIM port. Also, Windows can't reproduce the RMNET issue. --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=