From owner-freebsd-hackers Fri Sep 28 2: 9:35 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from scaup.mail.pas.earthlink.net (scaup.mail.pas.earthlink.net [207.217.121.49]) by hub.freebsd.org (Postfix) with ESMTP id 247EC37B40A for ; Fri, 28 Sep 2001 02:09:32 -0700 (PDT) Received: from mindspring.com (dialup-209.245.138.226.Dial1.SanJose1.Level3.net [209.245.138.226]) by scaup.mail.pas.earthlink.net (EL-8_9_3_3/8.9.3) with ESMTP id CAA20639; Fri, 28 Sep 2001 02:09:20 -0700 (PDT) Message-ID: <3BB43E70.C198F4BB@mindspring.com> Date: Fri, 28 Sep 2001 02:10:08 -0700 From: Terry Lambert Reply-To: tlambert2@mindspring.com X-Mailer: Mozilla 4.7 [en]C-CCK-MCD {Sony} (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Julian Elischer Cc: Dan Nelson , "Louis A. Mamakos" , Andrew Gallatin , hackers@FreeBSD.ORG Subject: Re: TCP&IP cksum offload on FreeBSD 4.2 References: <200109271416.f8REGaZ64624@whizzo.transsys.com> <15283.14648.430630.163513@grasshopper.cs.duke.edu> <200109271631.f8RGVCZ65964@whizzo.transsys.com> <15283.23007.137091.883110@grasshopper.cs.duke.edu> <200109271717.f8RHHBZ66485@whizzo.transsys.com> <20010928000651.C6178@dan.emsphone.com> <3BB4088E.7B65FDB5@elischer.org> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Julian Elischer wrote: > > Something to do would be to enable hardware checksumming on 1/2 your > > machines, and compare the bad packet counts at reported by netstat on > > the unchanged machines for (say) a 1-month period before and after the > > change. That should tell you whether you're gaining or losing > > reliability. It'll be really easy for me, as my current (software > > cksum) stats show no errors at all: > > the trouble is that if you are trying to find errors between RAM and WIRE > then the checksums will be correct regardless of whether there is an error.. > so the counts you are checking would be no use.. > you need to know what the correct packet contents should be.. I have a bad idea! I have a bad idea! (timeout for the "bad idea" dance...) Let's checksum all our RAM, so we can know when it corrupts data, too! ...at some point, you are going to have to trust your hardware. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message