Huge hogthreshold impact...

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I'd just like to understand something... My old server had the
'$_hogthreshold' set to '10' and it ran well until recently when they
added a lot of users.

I copied the '$_hogthreshold' value from the old setup to the new server
without really understanding what it does. It was running better then
the old one, but the server was still very busy and system load was
constantly above 60 (depending on number of concurrent DOS sessions).

Then I tried to change that to '1' (as in 'nicest'). This morning, when
all the users logged back in (a bit over 80 of them), I see the server
load is normal (mostly below 1, sometimes jumping up to 2-3) and CPU's
have some 'idle' time:

> Cpu0  : 26.5%us, 55.9%sy,  0.0%ni, 17.6%id,  0.0%wa,  0.0%hi, 
> 0.0%si,  0.0%st
> Cpu1  : 21.8%us, 43.2%sy,  0.0%ni, 35.0%id,  0.0%wa,  0.0%hi, 
> 0.0%si,  0.0%st
> Cpu2  : 24.3%us, 56.0%sy,  0.0%ni, 19.4%id,  0.0%wa,  0.0%hi, 
> 0.3%si,  0.0%st
> Cpu3  : 26.2%us, 56.5%sy,  0.0%ni, 17.3%id,  0.0%wa,  0.0%hi, 
> 0.0%si,  0.0%st

Yesterday CPU's never had any 'idle' time...

I assume users are doing pretty much the same stuff they were doing

So why would setting 'hogtreshold' to 10 cause so much system load? Did
that cause some kind of 'race' between DOSEMU's?


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