Subject: Re: nfsds using all CPU, STATE = "vnlock"
To: None <email@example.com>
From: Johan A.van Zanten <firstname.lastname@example.org>
Date: 10/14/2007 18:39:35
Bill Stouder-Studenmund <email@example.com> wrote:
> Pay attention to the ones not in "vnlock". Processes in "vnlock" are
> sleeping, waiting on a vnode lock. They thus aren't directly consuming
> CPU. You really want to know what the vnode lock holder is doing while
> this is happening.
When i've noticed it in top, 3-4 of the total 4 nfsds were in vnlock.
Would they appear to be using a lot of CPU if it's a spin lock?
> I'm going to blame softdeps. Can you try things w/o them?
Will do, as time permits.
> > The system seems to recover, but i have noticed some of the recorded
> > programs have lost substantial chunks of data, though that could
> > also be due to many other factors, such as antenna reception.
> Some sort of cleanup is happening and gobbling lots of CPU.
Yeah, the notion i had is that the recording software buffers some, but
then just starts dropping data as the writes queue.