[mythtv-users] pdflush is killing me

Brian Wood beww at beww.org
Mon Feb 5 22:55:27 UTC 2007

On Feb 5, 2007, at 1:48 PM, Mark Lehrer 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.

I wondered why you were using XFS. If it's the long erase time  
problem JFS will help that, as will the "slow erases" in Myth 0.20.

One problem with the slow erases though is that it only helps when  
Myth itself is doing the erasing, if you are erasing from another app  
you can still have problems.

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