Snapshot problems

Chris Dillon cdillon at
Tue Jul 5 20:56:03 GMT 2005

On Tue, 5 Jul 2005, Skylar Thompson wrote:

> On Sun, Jul 03, 2005 at 12:52:01PM +0200, Dag-Erling Smrgrav wrote:
>> Skylar Thompson <skylar at> writes:
>>> No joy. The machine hung again yesterday afternoon, with the error 
>>> "kern.ipc.maxpipekva exceeded" repeated over and over again on the 
>>> console.
>> So you're using a lot of pipes - more than the kernel can handle 
>> with the default parameters.  What's your workload?  Do you run a 
>> lot of jails?  What is the current value of kern.ipc.maxpipekva? 
>> Have you tried increasing it?
> I doubled it from 16 million to 32 million, and the machine still 
> crashes.

Could this just be a side-effect of the filesystem livelocking (I 
guess that is the appropriate term) and a script or other process 
getting out of control as a result?  If so, the "kern.ipc.maxpipekva" 
error would be irrelevant.  I don't recall seeing that error when the 
filesystem livelock happens to me, but I've only actually seen the 
console a few times when it happened, the rest of the times I had to 
power-cycle it remotely.

  Chris Dillon - cdillon(at)
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