linux-kernel - RE: Very long startup time for a new thread

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Message-ID: <BFECAF9E178F144FAEF2BF4CE739C668038E9BBF@exmail1.se.axis.com>
Date:	Mon, 17 Jul 2006 10:44:58 +0200
From:	"Mikael Starvik" <mikael.starvik@...s.com>
To:	"Mikael Starvik" <mikael.starvik@...s.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: RE: Very long startup time for a new thread

Thanks to all that have made suggestions. Finnaly we found that 

#define MIN_TIMESLICE 5
#define DEF_TIMESLICE 25

works much better for us. Maybe it is an effect of that we have HZ=100 ?

/Mikael

-----Original Message-----
From: Mikael Starvik [mailto:mikael.starvik@...s.com] 
Sent: Thursday, July 13, 2006 8:08 AM
To: 'Linux Kernel Mailing List'
Subject: Very long startup time for a new thread

(This is on a 200 MIPS embedded architecture).

On a heavily loaded system (loadavg ~4) I create a new pthread. In this
situation it takes ~4 seconds (!) before the thread is first scheduled
in (yes, I have debug outputs in the scheduler to check that). In a 2.4
based system I don't see the same thing. I don't have any RT or FIFO
tasks. Any ideas why it takes so long time and what I can do about it?

Appreciate any help
/Mikael
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