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From: Andrew Evans <andrewe@yahoo-inc.com>
To: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: profiling active RHEL 4 PV domains with xenoprof
Date: Fri, 29 Jan 2010 13:11:44 -0800	[thread overview]
Message-ID: <4B634F10.4060800@yahoo-inc.com> (raw)
In-Reply-To: <de76405a1001290441v310f94ffn6555616ed66aaa41@mail.gmail.com>

On 01/29/10 04:41, George Dunlap wrote:
> Re the PV kernels: are you sure that the PV kernel has support for Xen
> profiling? PV xenoprofile makes hypercalls to Xen to set up the
> performance event counters.  But if that isn't set up properly, or for
> some other reason doesn't work right, the guest oprofile may default
> back to using only timers, for which it doesn't need Xen's help (but
> which are less accurate especially in a virtual environment).
>   

I'm pretty sure RHEL 4's 2.6.9 kernel doesn't have the xenoprof patches,
but I haven't looked yet. I'm going to try the 2.6.18 xenU kernel I
built from the xen-unstable tree and see how that goes.

thanks,

-Andrew

  reply	other threads:[~2010-01-29 21:11 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-01-29  1:37 profiling active RHEL 4 PV domains with xenoprof Andrew Evans
2010-01-29 12:41 ` George Dunlap
2010-01-29 21:11   ` Andrew Evans [this message]
2010-01-29 17:04 ` Santos, Jose Renato G
2010-01-29 17:50   ` Dulloor
2010-01-29 21:14     ` Andrew Evans
2010-01-29 18:00   ` Andrew Evans
2010-01-30  0:24   ` Andrew Evans
2010-01-31 21:20     ` Santos, Jose Renato G
2010-02-01 18:40       ` Andrew Evans

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