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SubjectRe: Netscape and wait_on_page
Bill Hawes wrote:

> Arun Sharma wrote:
>
> > I see occassional 10-20 second freezes with Netscape navigator running
> > on a RH 4.2 box (Kernel 2.0.30).
> >
> > On doing ps, the Netscape process is shown to be in status D
> > (uninterruptible sleep) and is waiting for some page:
> >
> > 100000 9539 13934 13914 8 0 14044 8536 wait_on_pag D ? 0:01 /usr/lib/
> > 100000 9539 13935 13934 9 0 10636 812 do_select S ? 0:00 (dns help
> >
> > Does anyone know what's wrong ?
>
> Pages should not be taking that long to unlock. Can you add some
> diagnostics to find out what page it's waiting on? If page->inode is
> non-NULL, you could find out what fs it's on.
>
> I'd especially like to hear if it's a NFS page that's holding things up.

Don't know how to go about looking at page->inode. Should I use kgdb
or something ? Also, this scenerio is not deterministically
reproducible and when it does happen, after about 15-20 seconds,
the netscape process wakes up and runs normally.

But there is a high likelyhood that the page was a NFS page. My
$HOME/.netscape was on a NFS mounted directory.

My home directory was automounted via amd, if that is of any help.

-Arun





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