On Sat, Apr 07, 2018 at 02:34:54PM -0500, Justin Hibbits wrote:
> On Fri, Apr 6, 2018 at 10:25 AM, Justin Hibbits <chmeeed...@gmail.com> wrote:
> > On Fri, Apr 6, 2018 at 10:08 AM, Mark Johnston <ma...@freebsd.org> wrote:
> >> On Fri, Apr 06, 2018 at 12:47:14AM +0000, Justin Hibbits wrote:
> >>> My powerpc64 embedded machine is virtually unusable since these vm
> >>> changes.
> >>> I tried setting vfs.zfs.arc_free_target as suggested, and that didn't help
> >>> at all. Eventually the machine hangs and just gets stuck in vmdaemon, with
> >>> many processes in wait channel btalloc.
> >> You don't really have the same symptoms that Don is reporting.
> > Okay. I latched onto the thread because it seemed similar.
> >> Threads being stuck in btalloc implies a KVA shortage. So:
> >> - What do you mean by "stuck in vmdaemon"?
> > The machine hangs, and my ssh sessions get killed. I can't do
> > anything at the console except break into kdb. When I do, the running
> > thread is always vmdaemon.
> >> - Which commits specifically cause problems? Does reverting r329882 fix the
> >> hang?
> > I'll try reverting it and report back. Thankfully I can buildkernel
> > successfully on the machine before it hangs. Can't do more than that,
> > though.
> I reverted back to r329881, and successfully built world. Updated to
> r329882 and it got stuck with processes in btalloc.
> I've seen other reports of r329882 causing problems on powerpc64 as
> well, with other bizarre behaviors.
Did you try the patch that I had posted? If not, could you? Please also
update zfs_arc_free_target or just apply D14994.
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