On Wed, Apr 04, 2012 at 12:24:17AM +0530, shashank rachamalla wrote: > On Wed, Apr 4, 2012 at 12:13 AM, shashank rachamalla > <shashank.rachamalla@xxxxxxxxx> wrote: > > On Tue, Apr 3, 2012 at 10:28 PM, Gleb Natapov <gleb@xxxxxxxxxx> wrote: > >> On Tue, Apr 03, 2012 at 07:20:04PM +0530, shashank rachamalla wrote: > >>> On Mon, Mar 19, 2012 at 12:37 PM, Gleb Natapov <gleb@xxxxxxxxxx> wrote: > >>> > On Mon, Mar 19, 2012 at 12:20:30PM +0530, shashank rachamalla wrote: > >>> >> On Sun, Mar 18, 2012 at 10:21 PM, Gleb Natapov <gleb@xxxxxxxxxx> wrote: > >>> >> > 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. > >>> >> > >>> >> Currenly running 3.3.0-rc5. will try with the latest source from kvm > >>> >> git and let you know. > >>> >> > >>> >> > >>> > Thanks, there were some fixes that didn't make it into 3.3. rdpmc > >>> > instruction emulation fix is one of them. If oprofile uses it this can > >>> > explain the problem. > >>> > > >>> I have tried with latest kvm source from git and also with 3.0 guest > >>> kernel but oprofile fails to collect any samples on guest. I am using > >>> a core2duo processor which is considered by oprofile as pentium pro > >>> model. > >>> > >> core2duo on the host or the guest? What is your qemu command line? > >> > > both. qemu command line below. > > sudo /usr/local/bin/qemu-system-x86_64 -drive > > file=vdisk1.img,if=virtio -cpu host -m 2000 -net nic,model=virtio -net > > user > > > > please find more info ( /proc/cpuinfo and uname of both host and guest > ) in attached files. > oprofile does not work for me even on the host. After trying to use it I can see why perf was written in the first place. -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
