Packet loss every 30.999 seconds
Mark Fullmer
maf at eng.oar.net
Sun Dec 16 21:52:38 PST 2007
I'm about 99% sure right now. I'll set this up in a lab tomorrow
without an ethernet switch. It takes about a day of uptime before
the problem shows up.
Sorry for the duplicate messages, I misread a bounce notification.
--
mark
On Dec 17, 2007, at 12:43 AM, Jeremy Chadwick wrote:
> On Mon, Dec 17, 2007 at 12:21:43AM -0500, Mark Fullmer wrote:
>> While trying to diagnose a packet loss problem in a RELENG_6
>> snapshot dated
>> November 8, 2007 it looks like I've stumbled across a broken
>> driver or
>> kernel routine which stops interrupt processing long enough to
>> severly
>> degrade network performance every 30.99 seconds.
>>
>> Packets appear to make it as far as ether_input() then get lost.
>
> Are you sure this isn't being caused by something the switch is doing,
> such as MAC/ARP cache clearing or LACP? I'm just speculating, but it
> would be worthwhile to remove the switch from the picture (crossover
> cable to the rescue).
>
> I know that at least in the case of fxp(4) and em(4), Jack Vogel does
> some through testing of throughput using a professional/high-end
> packet
> generator (some piece of hardware, I forget the name...)
>
> --
> | Jeremy Chadwick jdc at
> parodius.com |
> | Parodius Networking http://
> www.parodius.com/ |
> | UNIX Systems Administrator Mountain View,
> CA, USA |
> | Making life hard for others since 1977. PGP:
> 4BD6C0CB |
>
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