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From: Emre Can Sezer <ecsezer@ncsu.edu>
Cc: xen-devel@lists.xensource.com
Subject: How expensive is a VM EXIT?
Date: Tue, 03 Mar 2009 10:35:15 -0500	[thread overview]
Message-ID: <49AD4E33.7070600@ncsu.edu> (raw)
In-Reply-To: <49A60045.8080406@oracle.com>

Hi,

I've been trying to get a ballpark number on how expensive a VM EXIT is 
in terms of clock cycles. I'm also interested in how slow a TLB miss is. 
The only reference I was able to find was 13000 cycles for VM EXIT and 
around several hundred cycles for a TLB miss and a complete walk of page 
tables. Does anyone know from the top of their head or is there a 
reference you can share?

Thanks in advance.

John

  reply	other threads:[~2009-03-03 15:35 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <32832343.231441235544321617.JavaMail.coremail@bj126app95.126.com>
2009-02-26  2:36 ` Questions on gdbsx Mukesh Rathor
2009-03-03 15:35   ` Emre Can Sezer [this message]
2009-03-03 16:34     ` How expensive is a VM EXIT? Keir Fraser
2009-03-04  0:15       ` NAHieu
2009-03-04  8:45         ` Keir Fraser
2009-03-04 18:39           ` Nadolski, Ed
2009-03-04 18:49             ` Keir Fraser

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