[mythtv-users] pdflush is killing me

[David Rees]

On 2/5/07, Mark Lehrer <mark at knm.org> wrote:
> On Mon, Feb 05, 2007 at 12:10:15PM -0800, David Rees wrote:
> > On 2/5/07, Mark Lehrer <mark at knm.org> wrote:
> > >I use NFS for my storage, XFS file system.  The problem only seems to
> > >happen when I am both recording and playing back a hi def stream at
> > >the same time.  Every minute or so on the server, pdflush will wake up
> > >and freeze all I/O for a couple of seconds.  The server is running
> > >Ubuntu 6.06.1 LTS, with this kernel: 2.6.15-26-686 #1 SMP PREEMPT
> >
> > Seems like a newer kernel couldn't hurt. Does Ubuntu have one
> > available? What is your frontend running?
>
> Frontend is Ubuntu 6.10.  I think I'll try ext3 on the server next,
> though it will kill performance in other ways.

It really sounds like a combination xfs + nfs issue to me, IIRC both
have had some locking performance issues, especially nfs which I
believe have been resolved in recent kernels, but the combination
could be making things worse.

Just to be clear, is your server just doing nfs/file serving duties or
does it also have the recorders, or does your frontend also have the
recorders in it?

-Dave