Odd performance problem (hitching)

Daniel O'Connor doconnor at gsoft.com.au
Tue Aug 30 08:20:58 GMT 2005


On Tuesday 30 August 2005 12:20, Don Lewis wrote:
> > The hitching happens even when the system is idle so I think you can MFC
> > safely.
>
> I'd be most suspicious of the MNT_VNODE_FOREACH loop in ffs_sync(),
> especially if the symptoms occur every 30 seconds.  Running the CPU at
> slow speed (with powerd, etc.) is likely to aggravate the problem.  What
> is the value of "sysctl kern.maxvnodes"?

kern.maxvnodes: 35360
kern.minvnodes: 8840
vfs.numvnodes: 12723
vfs.wantfreevnodes: 8840
vfs.freevnodes: 7829

> You might try significantly decreasing MAXVNODES_MAX in
> sys/kern/vfs_subr.c and rebuilding your kernel.

OK..
I'll try timing when the drop outs happen :)

-- 
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
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