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 100B8C433F5 for ; Mon, 10 Jan 2022 11:40:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244861AbiAJLkc (ORCPT ); Mon, 10 Jan 2022 06:40:32 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:34170 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244960AbiAJLim (ORCPT ); Mon, 10 Jan 2022 06:38:42 -0500 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 ams.source.kernel.org (Postfix) with ESMTPS id 19413B81617 for ; Mon, 10 Jan 2022 11:38:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id E2908C36AE3 for ; Mon, 10 Jan 2022 11:38:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1641814715; bh=5oOq2lbhSREP3GdtdZkoWzQb0BQ5dEK+T5YnzIerEnI=; h=From:To:Subject:Date:In-Reply-To:References:From; b=ENYi1xd59yvaY18YADaEwKdELyr/U+CrIuBdMQlx/+OYi6KrPmxRt5LVhX0W3EWCB wIGxcDdZZE3jcGcnhmN2hhL7CWeofJJOE2PIO3so7GfJ5sNUrMuz4BROM+jW8/ZIWm XgDnqydVFapbeKPiSoXf6jDrMLWLNkgAjpRCpj29LyE/GpdfzRSdDYxfhkaDcqXo2Y 8BnspcYqa6ws1l+v5xEb60weWnF69teGahBjekXaxq3f0vJMtt2m3VeJ55rnoH57+7 xWVdyZsWZz6RM/Cl5fguNUrunegMtgwGJ8Q1izc++W6FSvHwSqxAGWb/djNqkYHP7S PI8Z2UKgaKpBw== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id C75A8C05FF3; Mon, 10 Jan 2022 11:38:35 +0000 (UTC) From: bugzilla-daemon@bugzilla.kernel.org To: linux-usb@vger.kernel.org Subject: [Bug 215475] 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 11:38:35 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed 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: greg@kroah.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: Message-ID: In-Reply-To: References: 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 --- Comment #1 from Greg Kroah-Hartman (greg@kroah.com) --- On Mon, Jan 10, 2022 at 11:23:13AM +0000, bugzilla-daemon@bugzilla.kernel.o= rg wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=3D215475 >=20 > 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 Does this also happen on 5.16? > Created attachment 300251 > --> https://bugzilla.kernel.org/attachment.cgi?id=3D300251&action=3Dedit > iperf test result >=20 > 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-connect > 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 ab= out > 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. If you look at the usb traces, is the data the same? Any long pauses? thanks, greg k-h --=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.=