6.2 SHOWSTOPPER - em completely unusable on 6.2

[Oliver Brandmueller]

Hi,

On Wed, Sep 27, 2006 at 10:50:55AM -0500, Brooks Davis wrote:
> > Disk activity does not trigger the problem, I hammered the disk with 
> > around 85 MB/s (dd) for about half an hour without seeing any effect. A 
> > CPU bound thing like a buildworld triggered the problem.
> 
> I'm not sure that's a valid test by it self.  As things go, dd is pretty
> easy on the disk IO system especially with large buffer sizes.  I'd
> suggest tar extraction or possible parallel tar extraction.  The goal is
> to generate a large number of transations not large transactions.

The dd generated (accordings to gstat) around 600 tps by itself. Anyway,
at night, when the to-disk-backups from the other machines are coming
in, there are variuos large and small disk operations - and it never
happens in that case. On the other hand my other server, which does only 
few things on the disk, but has fewer CPU power and more CPU bound 
actions to do shows the behaviour very often (until I started to use 
polling). Disk activity might be a reason if the interrupt is shared 
with a disk controller, which is not the case for any of my affected 
machines.

- Oliver

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