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From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
To: 'Keith Owens' <kaos@ocs.com.au>, Ingo Molnar <mingo@elte.hu>
Cc: David.Mosberger@acm.org, Andrew Morton <akpm@osdl.org>,
	linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org
Subject: RE: Add prefetch switch stack hook in scheduler function
Date: Fri, 29 Jul 2005 08:08:48 +0000	[thread overview]
Message-ID: <200507290808.j6T88ng08130@unix-os.sc.intel.com> (raw)
In-Reply-To: <10462.1122622689@kao2.melbourne.sgi.com>
In-Reply-To: <200507272207.j6RM7fg18695@unix-os.sc.intel.com>

Keith Owens wrote on Friday, July 29, 2005 12:38 AM
> BTW, for ia64 you may as well prefetch pt_regs, that is also quite
> large.
> 
> #define MIN_KERNEL_STACK_FOOTPRINT (IA64_SWITCH_STACK_SIZE + IA64_PT_REGS_SIZE)

This has to be carefully done, because you really don't want to overwhelm
number of outstanding L2 cache misses.  It only has a limited amount of
queue and once that is filled, cpu get into L2 recirculate state.  And that
is going to be very painful because it translate into cpu stall cycles.


  parent reply	other threads:[~2005-07-29  8:08 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-07-27 22:07 Add prefetch switch stack hook in scheduler function Chen, Kenneth W
2005-07-27 23:13 ` Andrew Morton
2005-07-27 23:23   ` david mosberger
2005-07-28  7:41     ` Ingo Molnar
2005-07-28  8:09 ` Keith Owens
2005-07-28  8:16   ` Ingo Molnar
2005-07-28  9:09     ` Ingo Molnar
2005-07-28  8:31   ` Nick Piggin
2005-07-28  8:35     ` Ingo Molnar
2005-07-28  8:48       ` Nick Piggin
2005-07-28  9:16         ` Ingo Molnar
2005-07-28  9:19           ` Ingo Molnar
2005-07-28  9:34           ` Nick Piggin
2005-07-28 10:04             ` Ingo Molnar
2005-07-28 10:29               ` Nick Piggin
2005-07-28 19:14 ` Chen, Kenneth W
2005-07-29  7:04   ` Ingo Molnar
2005-07-29  7:07     ` Ingo Molnar
2005-07-29  8:30       ` Eric Dumazet
2005-07-29  8:44         ` Ingo Molnar
2005-07-29  9:17       ` Peter Zijlstra
2005-07-29 10:52         ` Ingo Molnar
2005-07-29  7:22 ` Chen, Kenneth W
2005-07-29  8:28   ` Ingo Molnar
2005-07-29  9:02     ` Russell King
2005-07-29  9:45       ` Ingo Molnar
2005-07-29  7:38 ` Keith Owens
2005-07-29  7:45 ` Keith Owens
2005-07-29  8:02 ` Chen, Kenneth W
2005-07-29  8:08 ` Chen, Kenneth W [this message]
2005-07-29  8:30 ` Chen, Kenneth W
2005-07-29  8:35   ` Ingo Molnar
2005-07-29  8:39 ` Chen, Kenneth W

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