From owner-freebsd-net@freebsd.org Wed Apr 14 21:27:51 2021 Return-Path: Delivered-To: freebsd-net@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id D90D25D0C38 for ; Wed, 14 Apr 2021 21:27:51 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 4FLFtv5cx7z4Tf3 for ; Wed, 14 Apr 2021 21:27:51 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id C0FC45D0E26; Wed, 14 Apr 2021 21:27:51 +0000 (UTC) Delivered-To: net@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id C0C515D0C37 for ; Wed, 14 Apr 2021 21:27:51 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4FLFtv52Tgz4TmR for ; Wed, 14 Apr 2021 21:27:51 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id A029F2509C for ; Wed, 14 Apr 2021 21:27:51 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 13ELRpS5065500 for ; Wed, 14 Apr 2021 21:27:51 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 13ELRp01065499 for net@FreeBSD.org; Wed, 14 Apr 2021 21:27:51 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 210901] em0 stores packets somewhere and lets them out slowly under load. Date: Wed, 14 Apr 2021 21:27:52 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 10.3-RELEASE X-Bugzilla-Keywords: IntelNetworking X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: dgilbert@eicat.ca X-Bugzilla-Status: Closed X-Bugzilla-Resolution: Not Enough Information X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: net@FreeBSD.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://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Apr 2021 21:27:51 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D210901 --- Comment #9 from dgilbert@eicat.ca --- to be clear, this didn't seem to be interrupt related at all. it was a resource starvation caused by memory fragmentation and the bone-headed way = we handle 9k jumbo frames. The whole problem would boil down to having a scar= ce few 9k jumbo frame buffers servicing all the packets coming in (and the few large ones going out). The system now has an mlxen driver card in it. Even more reason to prefer jumbo frames with 10GE, but, again... I haven't even bothered as it appeared that the jumbo frames were the issue, not the interrupts. So... it's very possible that this ticket should be closed --- but only if another regarding jumbo frames > 4k is opened. --=20 You are receiving this mail because: You are the assignee for the bug.=