On Sun, Jan 22, 2012 at 03:53:40PM +0100, Dominique Rodrigues wrote: > Le 22/01/2012 16:00, Alon Levy a écrit : > >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. > > > > Sounds promising.
Actually only 2x since we use a 32bit hash anyway (x86/x64). Still worth 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 > >>> > 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
