From: Gleb Natapov <gleb@redhat.com>
To: shashank rachamalla <shashank.rachamalla@gmail.com>
Cc: kvm@vger.kernel.org
Subject: Re: Questing regarding KVM Guest PMU
Date: Sun, 18 Mar 2012 18:51:20 +0200 [thread overview]
Message-ID: <20120318165120.GF27306@redhat.com> (raw)
In-Reply-To: <CAMONAZ5H9iet-sHS_tOZP7XoTyusttNYwrt4vNkaqV50woH-eQ@mail.gmail.com>
On Sun, Mar 18, 2012 at 09:47:55PM +0530, shashank rachamalla wrote:
> >> I guess things are working fine with perf. But why not with oprofile ?
> >>
> > Looks like it. I never tried oprofile. Will try to reproduce your
> > problem and see what oprofile is doing.
>
> I am using ubuntu 10.04 with 2.6.32-21-generic kernel as guest and
> oprofile 0.9.6.
> Also, I have tried to capture kvm-events ( perf patch ) in host while
> running oprofile and perf in guest.
> Please see the attachment. I have run the tests in three cases for the
> around 5 secs.
>
> There are more number of MSR reads and writes in case of perf which I
> think is normal. However, there are very few MSR reads and writes with
> oprofile. Also, the number of NMI exceptions are too high in case of
> oprofile.
>
Which host kernel are you using? Try latest kvm.git and check if you see
something unusual in dmesg.
--
Gleb.
next prev parent reply other threads:[~2012-03-18 16:51 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-18 10:18 Questing regarding KVM Guest PMU shashank rachamalla
2012-03-18 10:30 ` Gleb Natapov
2012-03-18 12:57 ` shashank rachamalla
2012-03-18 14:50 ` Avi Kivity
2012-03-18 14:50 ` Gleb Natapov
2012-03-18 16:17 ` shashank rachamalla
2012-03-18 16:51 ` Gleb Natapov [this message]
2012-03-19 6:50 ` shashank rachamalla
2012-03-19 7:07 ` Gleb Natapov
2012-04-03 13:50 ` shashank rachamalla
2012-04-03 16:58 ` Gleb Natapov
2012-04-03 18:43 ` shashank rachamalla
2012-04-03 18:54 ` shashank rachamalla
2012-04-04 7:04 ` Gleb Natapov
2012-04-04 10:19 ` shashank rachamalla
2012-04-04 10:29 ` Gleb Natapov
2012-04-05 2:37 ` shashank rachamalla
2012-04-05 12:27 ` Avi Kivity
2012-04-05 12:37 ` Gleb Natapov
2012-04-05 12:48 ` Avi Kivity
2012-04-05 13:26 ` Gleb Natapov
2012-04-05 13:28 ` Avi Kivity
2012-04-05 13:48 ` Gleb Natapov
2012-04-05 13:57 ` Gleb Natapov
2012-04-05 14:38 ` Avi Kivity
2012-04-05 14:41 ` Gleb Natapov
2012-04-06 5:13 ` shashank rachamalla
2012-04-06 6:50 ` Gleb Natapov
2012-04-08 15:27 ` Gleb Natapov
2012-04-09 9:26 ` Gleb Natapov
2012-04-10 3:18 ` shashank rachamalla
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