From nobody Sun Oct 16 08:49:43 2022 X-Original-To: freebsd-hackers@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4Mqv2W1Vvzz4fkTQ for ; Sun, 16 Oct 2022 08:49:55 +0000 (UTC) (envelope-from wojtek@puchar.net) Received: from puchar.net (puchar.net [194.1.144.90]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4Mqv2T40ztz45TN for ; Sun, 16 Oct 2022 08:49:53 +0000 (UTC) (envelope-from wojtek@puchar.net) Received: Received: from 127.0.0.1 (localhost [127.0.0.1]) by puchar.net (8.15.2/8.16.1) with ESMTPS id 29G8nimm064563 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sun, 16 Oct 2022 10:49:45 +0200 (CEST) (envelope-from wojtek@puchar.net) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=puchar.net; s=default; t=1665910185; bh=FCBsDBkzV7jC/u1q2jeJa1W1Jt/QVLNSQ4Kr12eKFgw=; h=Date:From:To:cc:Subject:In-Reply-To:References; b=dOuRag1n6nbv9OwHT/cvZ+1mSHvUeFftfNvmRD7r2lKh8trEqfQpRbFYQxdg/p/j2 YpxSDoX+t6b+EdZoN4eW73Sx3L5sEcXiqhm3SDQyA3p5L6LIe21YTiPvahLApJkB7N reiJaR0G8grXpijiyFh0E1qwZakRF/+BAIKrRAeM= Received: from wojtek.intra (localhost [127.0.0.1]) by wojtek.intra (8.16.1/8.16.1) with ESMTP id 29G8nioB025381; Sun, 16 Oct 2022 10:49:44 +0200 (CEST) (envelope-from wojtek@puchar.net) Received: from localhost (wojtek@localhost) by wojtek.intra (8.16.1/8.16.1/Submit) with ESMTP id 29G8nhe8025378; Sun, 16 Oct 2022 10:49:43 +0200 (CEST) (envelope-from wojtek@puchar.net) X-Authentication-Warning: wojtek.intra: wojtek owned process doing -bs Date: Sun, 16 Oct 2022 10:49:43 +0200 (CEST) From: Wojciech Puchar To: Jason Bacon cc: freebsd-hackers@freebsd.org Subject: Re: is this FreeBSD problem or HP switch In-Reply-To: Message-ID: References: <586238fe-a9f-94b5-65b6-bc505551e9fb@puchar.net> List-Id: Technical discussions relating to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-hackers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-hackers@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed X-Rspamd-Queue-Id: 4Mqv2T40ztz45TN X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=puchar.net header.s=default header.b=dOuRag1n; dmarc=none; spf=pass (mx1.freebsd.org: domain of wojtek@puchar.net designates 194.1.144.90 as permitted sender) smtp.mailfrom=wojtek@puchar.net X-Spamd-Result: default: False [-3.50 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-1.000]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[puchar.net:s=default]; R_SPF_ALLOW(-0.20)[+mx]; MIME_GOOD(-0.10)[text/plain]; FREEMAIL_TO(0.00)[gmail.com]; MLMMJ_DEST(0.00)[freebsd-hackers@freebsd.org]; FROM_EQ_ENVFROM(0.00)[]; ARC_NA(0.00)[]; RCVD_TLS_LAST(0.00)[]; MIME_TRACE(0.00)[0:+]; RCPT_COUNT_TWO(0.00)[2]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_SOME(0.00)[]; FROM_HAS_DN(0.00)[]; DKIM_TRACE(0.00)[puchar.net:+]; HAS_XAW(0.00)[]; ASN(0.00)[asn:43476, ipnet:194.1.144.0/24, country:PL]; DMARC_NA(0.00)[puchar.net]; MID_RHS_MATCH_FROM(0.00)[] X-ThisMailContainsUnwantedMimeParts: N >> > > I saw an issue some years ago where one of my FreeBSD servers was > overwhelming a Cisco switch while pushing files out to HTCondor nodes, > causing it to drop packets. Our networks guru confirmed the problem by > monitoring the switch. Since no handshaking was possible, I worked around it > by throttling the interface on the FreeBSD box, using ipfw if I recall > correctly. > There is zero packet loss, just completely variable delays that make normal work hard. up to 1000ms