Packet loss every 30.999 seconds

Kostik Belousov kostikbel at
Mon Dec 24 21:27:56 PST 2007

On Mon, Dec 24, 2007 at 08:16:50PM -0500, Mark Fullmer wrote:
> On Dec 24, 2007, at 8:19 AM, Kostik Belousov wrote:
> >
> >Mark, could you, please, retest the patch below in your setup ?
> >I want to put a change or some edition of it into the 7.0 release, and
> >we need to move fast to do this.
> It's building now.  The testing will run overnight.
> Your patch to ffs_sync() and vfs_msync() stopped the periodic packet  
> loss,
> but other file system activity such as (cd /; tar -cf - .) > /dev/ 
> null will
> cause dropped packets.  Same behavior, packets never make it up to the
> IP layer.

What fs do you use ? If FFS, are softupdates turned on ? Please, show the
total time spent in the softdepflush process.

Also, try to add the FULL_PREEMPTION kernel config option and report
whether it helps.
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