On Wed, Jan 18, 2012 at 11:59:45AM +0100, Dominique Rodrigues wrote: > Le 18/01/2012 11:48, Alon Levy a écrit : > >On Wed, Jan 18, 2012 at 11:39:13AM +0100, Dominique Rodrigues wrote: > >>Le 18/01/2012 11:32, Alon Levy a écrit : > >>>On Wed, Jan 18, 2012 at 11:27:14AM +0100, Dominique Rodrigues wrote: > >>>>Le 18/01/2012 11:18, Alon Levy a écrit : > >>>>>On Wed, Jan 18, 2012 at 09:54:49AM +0100, Dominique Rodrigues wrote: > >>>>>>Le 18/01/2012 09:44, Alon Levy a écrit : > >>>>>>>On Wed, Jan 18, 2012 at 08:06:40AM +0100, Dominique Rodrigues wrote: > >>>>>>>>Hi, > >>>>>>>> > >>>>>>>>Since I use qxl driver in virtual desktop powered by qemu-kvm, I > >>>>>>>>found a strange problem with Gimp. > >>>>>>>> > >>>>>>>>After launching Gimp, open a new windows, and then try to draw > >>>>>>>>something. It appears that the drawing is very slow and does not > >>>>>>>>follow the mouse at all. > >>>>>>>> > >>>>>>>>It is the same if I use spicy, spicec or vnc to connect to my > >>>>>>>>virtual desktop. > >>>>>>>> > >>>>>>>>This problem does not appear with cirrus or vmware graphic drivers. > >>>>>>>> > >>>>>>>>I found that on any Linux distribution (CentOS, RHEL, Scientific > >>>>>>>>Linux, Debian, Ubuntu). > >>>>>>>> > >>>>>>>>I currently use : > >>>>>>>>- qemu-kvm 1.0 compiled with spice support > >>>>>>>>- spice-protocol 0.10.1 > >>>>>>>>- spice 0.10 > >>>>>>>>- spice-gtk 0.7 > >>>>>>>>- xorg-qxl driver 0.16 > >>>>>>>> > >>>>>>>>Is there any explanation for that ? > >>>>>>>I would assume it is qxl driver cpu bound on something, probably busy > >>>>>>>waiting on the command ring. Can you run perf top on the guest? > >>>>>>> > >>>>>>Indeed, during the drawing in Gimp, Xorg takes between 55% and 66% of > >>>>>>CPU. > >>>>>> > >>>>>>After, Xorg goes down to 0.3%. > >>>>>> > >>>>>>(Test done on CentOS 6.2 guest, with 1280 Mb vRAM) > >>>>>ok, can you drill down - you should be able to install the debug symbols > >>>>>for the qxl driver (xorg-x11-drv-qxl package) and see the specific > >>>>>functions that are taking the most time. > >>>>> > >>>>I installed qxl driver from freedesktop.org : > >>>> > >>>># wget -c > >>>>http://xorg.freedesktop.org/releases/individual/driver/xf86-video-qxl-0.0.16.tar.bz2 > >>>># tar xvfj xf86-video-qxl-0.0.16.tar.bz2 > >>>># cd xf86-video-qxl-0.0.16 > >>>># ./configure --libdir=/usr/lib64 --prefix=/usr CFLAGS='-O3' > >>>># make > >>>># make install > >>>> > >>>>Do you mean that I should use CFLAGS with "-g" ? > >>>I think that's it, yes. > >>> > >>Ok. So how do you profile debug messages afterwhile ? > >> > >>If I "tail -f /var/log/Xorg.0.log", the only message I got is : > >> > >> Bad bpp: 1 (1) > >> > >>Other messages look standard. > >> > >Right, that's not interesting. What I meant was: > > > ># yum install perf > ># perf top > >copy paste the top entries. > > > Ok, that's it (from a screenshot of the VM):
Try ssh'ing to the vm, you can then use copy-paste. > > samples pcnt function DSO > > 3796.00 60.4% hashlittle This sucks, unfortunately I don't have any quick fix for it. It's the hash computation done on each image. Needless to say it needs to be optimized - either made more efficient or reduce the number of calls. Soren, FYI. > /usr/lib64/xorg/modules/drivers/qxl_drv.so > 2014.00 32.1% __memcpy_ssse3 /lib64/libc-2.12.so > 341.00 5.4% download_box > /usr/lib64/xorg/modules/drivers/qxl_drv.so > 61.00 1.0% __memset_sse2 /lib64/libc-2.12.so > 11.00 0.2% qxl_ring_push > /usr/lib64/xorg/modules/drivers/qxl_drv.so > 10.00 0.2% finish_task_switch [kernel.kallsyms] > 8.00 0.1% qxl_allocnf > /usr/lib64/xorg/modules/drivers/qxl_drv.so > 8.00 0.1% retint_careful [kernel.kallsyms] > 6.00 0.1% hash_and_copy > /usr/lib64/xorg/modules/drivers/qxl_drv.so > > >>>>>>>>Regards, > >>>>>>>> > >>>>>>>>-- > >>>>>>>> > >>>>>>>> > >>>>>>>> Dominique Rodrigues > >>>>>>>> > >>>>>>>>nanoClouD<http://www.nanocloud.com> > >>>>>>>>8, rue Lemercier > >>>>>>>>75017 Paris > >>>>>>>>France > >>>>>>>>standard : +33 1 77 69 64 38 > >>>>>>>>529 002 743 R.C.S. Paris > >>>>>>>>begin:vcard > >>>>>>>>fn:Dominique Rodrigues > >>>>>>>>n:Rodrigues;Dominique > >>>>>>>>org:nanoClouD > >>>>>>>>adr:;;8, rue Lemercier;Paris;;75017;France > >>>>>>>>email;internet:dominique.rodrig...@nanocloud.com > >>>>>>>>title:Directeur Technique > >>>>>>>>tel;work:+33 (0) 1 77 69 64 38 > >>>>>>>>tel;cell:+33 (0) 6 28 52 37 70 > >>>>>>>>url:www.nanocloud.com > >>>>>>>>version:2.1 > >>>>>>>>end:vcard > >>>>>>>> > >>>>>>>>_______________________________________________ > >>>>>>>>Spice-devel mailing list > >>>>>>>>Spice-devel@lists.freedesktop.org > >>>>>>>>http://lists.freedesktop.org/mailman/listinfo/spice-devel > >>>>>>begin:vcard > >>>>>>fn:Dominique Rodrigues > >>>>>>n:Rodrigues;Dominique > >>>>>>org:nanoClouD > >>>>>>adr:;;8, rue Lemercier;Paris;;75017;France > >>>>>>email;internet:dominique.rodrig...@nanocloud.com > >>>>>>title:Directeur Technique > >>>>>>tel;work:+33 (0) 1 77 69 64 38 > >>>>>>tel;cell:+33 (0) 6 28 52 37 70 > >>>>>>url:www.nanocloud.com > >>>>>>version:2.1 > >>>>>>end:vcard > >>>>>> > >>>>> > >>>>>>_______________________________________________ > >>>>>>Spice-devel mailing list > >>>>>>Spice-devel@lists.freedesktop.org > >>>>>>http://lists.freedesktop.org/mailman/listinfo/spice-devel > >>>>begin:vcard > >>>>fn:Dominique Rodrigues > >>>>n:Rodrigues;Dominique > >>>>org:nanoClouD > >>>>adr:;;8, rue Lemercier;Paris;;75017;France > >>>>email;internet:dominique.rodrig...@nanocloud.com > >>>>title:Directeur Technique > >>>>tel;work:+33 (0) 1 77 69 64 38 > >>>>tel;cell:+33 (0) 6 28 52 37 70 > >>>>url:www.nanocloud.com > >>>>version:2.1 > >>>>end:vcard > >>>> > >>> > >>begin:vcard > >>fn:Dominique Rodrigues > >>n:Rodrigues;Dominique > >>org:nanoClouD > >>adr:;;8, rue Lemercier;Paris;;75017;France > >>email;internet:dominique.rodrig...@nanocloud.com > >>title:Directeur Technique > >>tel;work:+33 (0) 1 77 69 64 38 > >>tel;cell:+33 (0) 6 28 52 37 70 > >>url:www.nanocloud.com > >>version:2.1 > >>end:vcard > >> > > > > > > > >>_______________________________________________ > >>Spice-devel mailing list > >>Spice-devel@lists.freedesktop.org > >>http://lists.freedesktop.org/mailman/listinfo/spice-devel > begin:vcard > fn:Dominique Rodrigues > n:Rodrigues;Dominique > org:nanoClouD > adr:;;8, rue Lemercier;Paris;;75017;France > email;internet:dominique.rodrig...@nanocloud.com > title:Directeur Technique > tel;work:+33 (0) 1 77 69 64 38 > tel;cell:+33 (0) 6 28 52 37 70 > url:www.nanocloud.com > version:2.1 > end:vcard > _______________________________________________ Spice-devel mailing list Spice-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/spice-devel
