On Fri, Jan 20, 2012 at 02:04:47PM -0500, Yaniv Kaul wrote: > ----- Original Message ----- > > 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. > > You could move to murmur2, like Windows' QXL driver > (https://bugs.freedesktop.org/show_bug.cgi?id=37465) or murmur3 or other > faster ones (https://bugs.freedesktop.org/show_bug.cgi?id=35775). > At least it's not hashed twice > now(https://bugs.freedesktop.org/show_bug.cgi?id=37977 - worth updating bug > status?!), but I'm not sure it should be hashed at all, if it's not cached. > Y.
Looks like this could be x6 performance gain when compared to hashlittle (lookup3 at http://code.google.com/p/smhasher/). So it would still be better not to run it at all but it might stop being the bottleneck. I'll try to do a patch. > > > > > > > /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 > > _______________________________________________ Spice-devel mailing list Spice-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/spice-devel
