Re: A unresponsive file system can hang all I/O in the system on linux-2.6.23-rc6 (dirty_thresh problem?)

Peter Zijlstra
2007-09-28T09:12:09Z

[-- Attachment #1.1: Type: text/plain, Size: 763 bytes --]

On Fri, 2007-09-28 at 02:01 -0700, Chakri n wrote:
> Thanks for explaining the adaptive logic.
>
> > However other devices will at that moment try to maintain a limit of 0,
> > which ends up being similar to a sync mount.
> >
> > So they'll not get stuck, but they will be slow.
> >
> >
>
> Sync should be ok, when the situation is bad like this and some one
> hijacked all the buffers.
>
> But, I see my simple dd to write 10blocks on local disk never
> completes even after 10 minutes.
>
> [root@h46 ~]# dd if=/dev/zero of=/tmp/x count=10
>
> I think the process is completely stuck and is not progressing at all.
>
> Is something going wrong in the calculations where it does not fall
> back to sync mode.

What kernel is that?

[-- Attachment #1.2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 189 bytes --]

[-- Attachment #2: Type: text/plain, Size: 0 bytes --]