Packet loss every 30.999 seconds

Mark Fullmer maf at
Wed Dec 19 09:07:18 PST 2007

On Dec 19, 2007, at 9:54 AM, Bruce Evans wrote:

> On Tue, 18 Dec 2007, Mark Fullmer wrote:
>> A little progress.
>> I have a machine with a KTR enabled kernel running.
>> Another machine is running David's ffs_vfsops.c's patch.
>> I left two other machines (GENERIC kernels) running the packet  
>> loss test
>> overnight.  At ~ 32480 seconds of uptime the problem starts.  This  
>> is really
> Try it with "find / -type f >/dev/null" to duplicate the problem  
> almost
> instantly.

I was able to verify last night that (cd /; tar -cpf -) > all.tar would
trigger the problem.  I'm working getting a test running with
David's ffs_sync() workaround now, adding a few counters there should
get this narrowed down a little more.

Thanks for the other info on timer resolution, I overlooked


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