Subject: Re: scheduler woes on MPACPI kernel
To: Frank van der Linden <>
From: Johnny Billquist <bqt@Update.UU.SE>
List: current-users
Date: 01/18/2005 23:14:40
On Tue, 18 Jan 2005, Frank van der Linden wrote:

> On Tue, Jan 18, 2005 at 10:53:26PM +0100, Johnny Billquist wrote:
>> Huh? I didn't understand this...
>> Are you claiming that a finer grained lock will decrease performance? Or
>> is there a serious bug in the Linux kernel?
> For an HT system, finer grained locks can have the effect of increasing
> the problem of virtual CPUs competing for e.g. cache and TLB entries. Thus
> making the system slower.

Hmm. I haven't given much thought on how much impact shared cache and TLB 
can have. Is it really that bad?


Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email:           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol