Le 18/01/2012 17:43, Alon Levy a écrit :
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.
Yes, so here is another timing from ssh login on the VM :PerfTop: 686 irqs/sec kernel: 0.4% exact: 0.0% [1000Hz cpu-clock], (all, 1 CPU)
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samples pcnt function DSO
_______ _____ _______________________
__________________________________________
5817.00 62.0% hashlittle /usr/lib64/xorg/modules/drivers/qxl_drv.so
2821.00 30.0% __memcpy_ssse3 /lib64/libc-2.12.so
384.00 4.1% download_box
/usr/lib64/xorg/modules/drivers/qxl_drv.so
207.00 2.2% fetch_scanline_x8r8g8b8
/usr/lib64/libpixman-1.so.0.18.4
74.00 0.8% __memset_sse2 /lib64/libc-2.12.so
17.00 0.2% qxl_allocnf
/usr/lib64/xorg/modules/drivers/qxl_drv.so
16.00 0.2% finish_task_switch [kernel.kallsyms]
11.00 0.1% retint_careful [kernel.kallsyms]
9.00 0.1% _spin_unlock_irqrestore [kernel.kallsyms]
8.00 0.1% hash_and_copy
/usr/lib64/xorg/modules/drivers/qxl_drv.so
samples pcnt function DSO 3796.00 60.4% hashlittleThis 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.
Ok. So I hope you'll find some optimizations in a close future. Thank you anyway for all the nice job already done on SPICE.
/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.soRegards, -- 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-develbegin: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-develbegin: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:vcardbegin: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-develbegin: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
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