Re: Packet loss every 30.999 seconds

On Tue, 18 Dec 2007, David G Lawrence wrote:

Thanks. Have a kernel building now. It takes about a day of uptime
after reboot before I'll see the problem.

You may also wish to try to get the problem to occur sooner after boot
on a non-patched system by doing a "tar cf /dev/null /" (note: substitute
/dev/zero instead of /dev/null, if you use GNU tar, to disable its
"optimization"). You can stop it after it has gone through a 100K files.
Verify by looking at "sysctl vfs.numvnodes".

Hmm, I said to use "find /", but that is not so good since it only
looks at directories and directories (and their inodes) are not packed
as tightly as files (and their inodes). Optimized tar, or "find /
-type f", or "ls -lR /", should work best, by doing not much more than
stat()ing lots of files, while full tar wastes time reading file data.

I have no reason to believe that just reading directories will
reproduce the problem with file vnodes. You need to open the files
and read them. Nothing else will do.

-DG

David G. Lawrence
President
Download Technologies, Inc. - http://www.downloadtech.com - (866) 399 8500
The FreeBSD Project - http://www.freebsd.org
Pave the road of life with opportunities.
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  • Re: Packet loss every 30.999 seconds
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