Reduced hard disk perfomance on 5.4 with SMP

[Kris Kennaway]

On Sat, Nov 12, 2005 at 10:50:03PM +0300, Tarasov Alexey wrote:
> Hello!
> 
> I have a server Double Xeon 2.4 GHz with Hyperthreading on.

> Operations with hard disk (e.g. unpacking huge .tgz archive with a lot 
> of files) are very slow. Why it can be?

VFS was Giant-locked on 5.4, and there is contention between multiple
processes (e.g. tar and bufdaemon).  Try 6.0 instead.

Kris
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