WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-tools

Re: [Xen-devel] Hi,something about the xentrace tool

To: "Rob Gardner" <rob.gardner@xxxxxx>
Subject: Re: [Xen-devel] Hi,something about the xentrace tool
From: "George Dunlap " <dunlapg@xxxxxxxxx>
Date: Wed, 21 Jun 2006 15:02:43 -0400
Cc: xen-tools@xxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Wed, 21 Jun 2006 12:04:07 -0700
Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=dX8at0FN0vKY2ZWl2e0ou7vCtJsMMw9JmAhmDjFZ46noikuCdcQVoDEdNtRZwkBb1wFbVLghU6BpVaYbbo/BDIdmO3RwOkA1qkvD+M95+oXl3IzUQpzE+y6IhC7YvQZ3UJ6JzCYoPwLRqiOpeBwUj1zdr5MwlH6zoXdJEniO/7k=
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <4496DC97.5060203@xxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <A95E2296287EAD4EB592B5DEEFCE0E9D4BAAAA@xxxxxxxxxxxxxxxxxxxxxxxxxxx> <8061f8830606150158m35f11025t43c3fa962ccd6679@xxxxxxxxxxxxxx> <449192E1.4080808@xxxxxx> <de76405a0606151120m5f333609s126bda4d33e73ef@xxxxxxxxxxxxxx> <4491AC9A.2090906@xxxxxx> <de76405a0606181806y4d08998ua680342c561be6d0@xxxxxxxxxxxxxx> <44962F85.4060005@xxxxxx> <de76405a0606190702k24196e08ve5f871b0ef5a4cf0@xxxxxxxxxxxxxx> <4496DC97.5060203@xxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
On 6/19/06, Rob Gardner <rob.gardner@xxxxxx> wrote:
I am glad to discover that I misunderstood you. ;) But I am still having
trouble understanding what the actual problem is, or even if one exists.

Well, I ran some tests, and no problem exists, yet.  Running the following:

# time xentrace -e 0x81000 /tmp/test22-passmark.trace
change evtmask to 0x81000

real    7m15.456s
user    0m0.080s
sys     0m0.050s
# ls -l /tmp/test22-passmark.trace
-rw-r--r-- 1 root root 2654091720 Jun 21 14:49 /tmp/test22-passmark.trace

So although 2.6 gigabytes was generated in 7 minutes, the total time
spent in user and system (if the numbers time report are accurate) was
less than .13 seconds.

The only potential issues would be with cache trashing -- both the
buffer cache (from plain writes to the file), and the cpu caches (from
copying the data).  If anyone finds a workload this is a problem for,
we can look at it then.

-George

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel