* David G Lawrence <[EMAIL PROTECTED]> [071219 09:12] wrote: > > >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. > > Unfortunately, the version of the patch that I sent out isn't going to > help your problem. It needs to yield at the top of the loop, but vp isn't > necessarily valid after the wakeup from the msleep. That's a problem that > I'm having trouble figuring out a solution to - the solutions that come > to mind will all significantly increase the overhead of the loop. > As a very inadequate work-around, you might consider lowering > kern.maxvnodes to something like 20000 - that might be low enough to > not trigger the problem, but also be high enough to not significantly > affect system I/O performance.
I apologize for not reading the code as I am swamped, but a technique that Matt Dillon used for bufs might work here. Can you use a placeholder vnode as a place to restart the scan? you might have to mark it special so that other threads/things (getnewvnode()?) don't molest it, but it can provide for a convenient restart point. -- - Alfred Perlstein _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
