linux-kernel - 2.6.19-rt14 slowdown compared to 2.6.19

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Date:	Fri, 22 Dec 2006 13:39:15 -0800
From:	"Chen, Tim C" <tim.c.chen@...el.com>
To:	<mingo@...e.hu>
Cc:	<linux-kernel@...r.kernel.org>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Subject: 2.6.19-rt14 slowdown compared to 2.6.19

Ingo,

We did some benchmarking on 2.6.19-rt14, compared it with 2.6.19 
kernel and noticed several slowdowns.  The test machine is a 2 socket
woodcrest machine with your default configuration.

Netperf TCP Streaming was slower by 40% ( 1 server and 1 client 
each bound to separate cpu cores on different socket, network
loopback mode was used).  

Volanomark was slower by 80% (Server and Clients communicate with 
network loopback mode. Idle time goes from 1% to 60%)

Re-Aim7 was slower by 40% (idle time goes from 0% to 20%)

Wonder if you have any suggestions on what could cause the slowdown.  
We've tried disabling CONFIG_NO_HZ and it didn't help much.

Thanks.

Tim
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