Subject: Re: jerky interactive behavior
To: Perry E. Metzger <email@example.com>
From: Steven M. Bellovin <firstname.lastname@example.org>
Date: 01/21/2007 17:02:43
On Sun, 21 Jan 2007 16:48:15 -0500
"Perry E. Metzger" <email@example.com> wrote:
> "Steven M. Bellovin" <firstname.lastname@example.org> writes:
> >> As of Jan, something seems to have broken BUFQ_READPRIO -- unclear
> >> who did it or why, but it is very clear to me that it got broken.
> >> The old symptoms of lots of disk i/o locking out userland
> >> processes trying to read something have returned.
> > I do indeed have BUFQ_READPRIO defined, but I'm far from convinced
> > that that's the problem -- this is happening without any
> > disk-intensive activity going on in the background. Sure, there's
> > always something some daemon is doing, but I've tried shutting down
> > other things.
> I've been looking very carefully at my disk light when the hangs
> happen, and there is usually disk i/o in progress when the hangs
> occur. Are you sure your disk light on your T41 isn't going off at the
> same time at all?
Certain? No. But I've been watching it, too.
--Steve Bellovin, http://www.cs.columbia.edu/~smb