Date: Fri, 20 Oct 2006 10:08:56 -0700 From: "Jack Vogel" <jfvogel@gmail.com> To: "Scott Long" <scottl@samsco.org> Cc: Bill Paul <wpaul@freebsd.org>, freebsd-stable@freebsd.org, kris@obsecurity.org Subject: Re: em network issues Message-ID: <2a41acea0610201008s301d963ds5728d7b145a5e5b4@mail.gmail.com> In-Reply-To: <4538FF57.1070109@samsco.org> References: <20061020163800.DB21C16A47B@hub.freebsd.org> <4538FF57.1070109@samsco.org>
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On 10/20/06, Scott Long <scottl@samsco.org> wrote: > Bill Paul wrote: > > [Charset ISO-8859-1 unsupported, filtering to ASCII...] > > > >>On 10/19/06, Kris Kennaway <kris@obsecurity.org> wrote: > >> > >>>On Thu, Oct 19, 2006 at 02:18:13PM -0700, Jack Vogel wrote: > >>> > >>>>The engineer in our test group has installed 6.2 BETA2 and attempted via a > >>>>number of tests to reproduce this problem, the machine even shares the em > >>>>interrupt with usb, and yet so far he has been unsuccessful. > >>> > >>>What tests is he running? > >> > >>He tried doing something Kip said reliably repro'd the issue, building a big > >>source archive over NFS. Then he has been running a continuous NFS data > >>back and forth copy since, that is still ongoing. > >> > >>Other suggestions? > >> > >>Jack > >> > > > > > > Just out of curiosity, what sort of torture tests does Intel do, in > > general, on the em driver on FreeBSD? One thing that I've found which > > works wonders at exposing race conditions is the Smartbits bi-directional > > IP forwarding test. Put two NICs in a system, configure for it for IP > > forwarding, then connect the Smartbits to each port and run the > > SmartApps router test in bi-directional mode. At 64 bytes per frame, > > it will try to push 2.96 million packets/second through both ports > > simultaneously (1.48 million in each direction). Of course, you won't > > actually be able to forward all the traffic, but the interfaces (not > > to mention the OS) should continue running regardless. > > > > This test exercises both the RX and TX paths and generates hundreds of > > thousands of interrupts per second. You'd be amazed at the sort of > > things you can discover with it. The downside of course is that a > > Smartbits with gigE ports isn't cheap, but I'd be surprised if Intel > > didn't have one kicking around somewhere. > > > > -Bill > > > > This is exactly the test that Andre and I were running, though only in > one direction (I think due to lack of hardware for a full test). > Prior to the INTR_FAST change, the machine would live-lock. Now it > survives, stays responsive, and drops packets as needed. I just checked with our group lead (John Ronciak) and he says I have a Smartbits available to me, so I'm gonna try and get this set up :) Thanks for the suggestion Bill. Jack
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