sustained sequential disk IO runs interactivity into the ground

[Steven Hartland]

Have you tried the vfs patch posted a few weeks ago?

    Steve / K
----- Original Message ----- 
From: <eng at donut.ugcs.caltech.edu>


>I was doing a dd of dev/zero into a file on a UFS2 filesystem
> (softupdates disabled) on a clean 5.4-R system.
> 
> an exec of top took approximately 30 seconds to complete
> and then revealed sys: 13% and idle: 87%
> 
> quit, repeat five times, same delay, same numbers each time.
> 
> FreeBSD 4.11 managed this with only a minor interactivity
> hit.
> 
> What's going on here?  Any ideas?


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