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From: Andrew Theurer <habanero@us.ibm.com>
To: Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>
Cc: xen-devel@lists.xensource.com
Subject: Re: [PATCH] turn off writable page tables
Date: Tue, 25 Jul 2006 21:25:14 -0500	[thread overview]
Message-ID: <44C6D28A.3010004@us.ibm.com> (raw)
In-Reply-To: <A95E2296287EAD4EB592B5DEEFCE0E9D572236@liverpoolst.ad.cl.cam.ac.uk>

Ian Pratt wrote:
>> on Xeon MP processor, uniprocessor dom0 kernel, pae=y:
>>
>> benchmark                c/s 10729 force_emulate
>> ------------------------ --------- -------------
>> lmbench fork+exit:       469.5833  470.3913   usec, lower is better
>> lmbench fork+execve:     1241.0000 1225.7778  usec, lower is better
>> lmbench fork+/sbin/bash: 12190.000 12119.000  usec, lower is better
>>     
>
> It's kinda weird that these scores are so close -- I guess its just
> coincidence that we must be getting something like an average of 10-20
> pte's updated per pagetable page and the cost of doing multiple emulates
> perfectly balances the cost of unhooking/rehooking.
>   
Ian, I'll try a small program which dirties a large chunk of memory.  
I'll also try the trace tool and see what we get.

Thanks,

Andrew

  reply	other threads:[~2006-07-26  2:25 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-07-25 22:41 [PATCH] turn off writable page tables Ian Pratt
2006-07-26  2:25 ` Andrew Theurer [this message]
2006-07-26  5:31   ` Jacob Gorm Hansen
2006-07-26  8:18 ` Gerd Hoffmann
2006-07-26  8:40   ` Keir Fraser
2006-07-26 21:10     ` Andrew Theurer
  -- strict thread matches above, loose matches on Subject: below --
2006-07-28 15:51 Ian Pratt
2006-07-28 16:31 ` Keir Fraser
2006-07-28 21:36   ` Zachary Amsden
2006-07-28 23:05     ` Andi Kleen
2006-07-28 23:10       ` Zachary Amsden
2006-07-31  9:14         ` Keir Fraser
2006-07-31  9:32           ` Zachary Amsden
2006-07-31  9:53             ` Keir Fraser
2006-07-31 19:56               ` Zachary Amsden
2006-07-31 22:07                 ` Keir Fraser
2006-07-31 22:40                   ` Zachary Amsden
2006-08-02  9:21                     ` Keir Fraser
2006-07-27 17:31 Ian Pratt
2006-07-28  8:55 ` Keir Fraser
2006-07-28 15:21   ` Andrew Theurer
     [not found] <E1G5sBV-0005eg-At@host-192-168-0-1-bcn-london>
2006-07-26 23:38 ` Joe Bonasera
2006-07-26 21:38 Ian Pratt
2006-07-27 14:43 ` Andrew Theurer
2006-07-27 15:30   ` Keir Fraser
2006-07-25 22:14 Andrew Theurer
2006-07-25 22:43 ` Nivedita Singhvi
2006-07-25 23:19   ` Andrew Theurer

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