Hi Jeremy,
today I tested the maverick alpha 1 and observed the same behavior as with
lucid:
1. No extra kernel parameters:
- vga16fb is loaded and not [u]vesafb
- thus the framebuffer terminal does not work on my NC20 (maybe I should open
a bug for this, too?)
- no PAT entries are created by vga16fb
- correct (write combining) PAT entries for "openchrome"
2. "video=vesafb:mtrr=3 vga=792" kernel parameter
- vesafb is loaded
- now the framebuffer terminal works correctly
- "uncached-minus" PAT entries are created by vesafb
- incorrect (uncached-minus) PAT entries for "openchrome"
Unfortunately the maverick alpha 1 ISO has no uvesafb in the initramfs,
so I couldn't test this.
I will upload the apport files while above config 2. is loaded.
Kind regards,
Thomas
** Tags added: apport-collected
** Description changed:
Hi,
when using uvesafb or vesafb, these drivers will create uncached-minus
PAT entries for the framebuffer memory because they use ioremap(). WHen
the framebuffer memory intersects with the video RAM used by Xorg, the
complete video RAM will be mapped uncached-minus what results in a
server performance penalty.
Here are the correct MTRR entries created by uvesafb:
schli...@netbook:~$ cat /proc/mtrr
reg00: base=0x000000000 ( 0MB), size= 2048MB, count=1: write-back
reg01: base=0x06ff00000 ( 1791MB), size= 1MB, count=1: uncachable
reg02: base=0x070000000 ( 1792MB), size= 256MB, count=1: uncachable
reg03: base=0x0d0000000 ( 3328MB), size= 16MB, count=1: write-combining
And here are the problematic PAT entries:
schli...@netbook:~$ sudo cat /sys/kernel/debug/x86/pat_memtype_list
PAT memtype list:
write-back @ 0x0-0x1000
uncached-minus @ 0x6fedd000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee3000-0x6fee4000
uncached-minus @ 0x6fee3000-0x6fee4000
uncached-minus @ 0x6fee3000-0x6fee4000
uncached-minus @ 0xd0000000-0xe0000000 <-- created by xserver-xorg
uncached-minus @ 0xd0000000-0xd1194000 <-- created by uvesafb
uncached-minus @ 0xf4000000-0xf4009000
uncached-minus @ 0xf4200000-0xf4400000
uncached-minus @ 0xf5000000-0xf5010000
uncached-minus @ 0xf5100000-0xf5104000
uncached-minus @ 0xf5400000-0xf5404000
uncached-minus @ 0xf5404000-0xf5405000
uncached-minus @ 0xf5404000-0xf5405000
uncached-minus @ 0xfed00000-0xfed01000
Therefore I created the attached patch for uvesafb which uses ioremap_wc() to
create the correct PAT entries, as shown below:
schli...@netbook:~$ sudo cat /sys/kernel/debug/x86/pat_memtype_list
PAT memtype list:
write-back @ 0x0-0x1000
uncached-minus @ 0x6fedd000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee2000-0x6fee3000
uncached-minus @ 0x6fee3000-0x6fee4000
uncached-minus @ 0x6fee3000-0x6fee4000
uncached-minus @ 0x6fee3000-0x6fee4000
write-combining @ 0xd0000000-0xe0000000
write-combining @ 0xd0000000-0xd1194000
uncached-minus @ 0xf4000000-0xf4009000
uncached-minus @ 0xf4200000-0xf4400000
uncached-minus @ 0xf5000000-0xf5010000
uncached-minus @ 0xf5100000-0xf5104000
uncached-minus @ 0xf5400000-0xf5404000
uncached-minus @ 0xf5404000-0xf5405000
uncached-minus @ 0xf5404000-0xf5405000
uncached-minus @ 0xfed00000-0xfed01000
This results in a performance gain, objectively measurable with e.g. x11perf
-comppixwin10 -comppixwin100 -comppixwin500:
1: x11perf_xaa_lucid.log
2: x11perf_xaa_lucid_patched.log
1 2 Operation
-------- ----------------- -----------------
300000.0 296000.0 ( 0.99) Composite 10x10 from window to window
38400.0 38500.0 ( 1.00) Composite 100x100 from window to window
1760.0 1760.0 ( 1.00) Composite 500x500 from window to window
124000.0 202000.0 ( 1.63) Composite 10x10 from pixmap to window
3340.0 24400.0 ( 7.31) Composite 100x100 from pixmap to window
131.0 1150.0 ( 8.78) Composite 500x500 from pixmap to window
You can see the serve performance gain when composing larger pixmaps to
window.
Please consider applying/pushing the attached patch. I'll also attach a very
similar patch for vesafb.
Kind regards,
Thomas
+ ---
+ AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.22.1.
+ AplayDevices:
+ **** List of PLAYBACK Hardware Devices ****
+ card 0: VT82xx [HDA VIA VT82xx], device 0: ALC272 Analog [ALC272 Analog]
+ Subdevices: 1/1
+ Subdevice #0: subdevice #0
+ Architecture: i386
+ ArecordDevices:
+ **** List of CAPTURE Hardware Devices ****
+ card 0: VT82xx [HDA VIA VT82xx], device 0: ALC272 Analog [ALC272 Analog]
+ Subdevices: 1/1
+ Subdevice #0: subdevice #0
+ CRDA: Error: [Errno 2] No such file or directory
+ Card0.Amixer.info:
+ Card hw:0 'VT82xx'/'HDA VIA VT82xx at 0xf5400000 irq 51'
+ Mixer name : 'Realtek ALC272'
+ Components : 'HDA:10ec0272,144dc04e,00100001'
+ Controls : 14
+ Simple ctrls : 8
+ DistroRelease: Ubuntu 10.10
+ LiveMediaBuild: Ubuntu 10.10 "Maverick Meerkat" - Alpha i386 (20100602.2)
+ MachineType: SAMSUNG ELECTRONICS CO., LTD. NC20/NB20
+ Package: linux (not installed)
+ ProcCmdLine: BOOT_IMAGE=/casper/vmlinuz noprompt cdrom-detect/try-usb=true
file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz
video=vesafb:mtrr=3 vga=792 quiet splash -- priority=low
debian-installer/language=de console-setup/layoutcode?=de
+ ProcEnviron:
+ LANG=de_DE.UTF-8
+ SHELL=/bin/bash
+ ProcVersionSignature: Ubuntu 2.6.34-5.13-generic 2.6.34
+ Regression: No
+ RelatedPackageVersions: linux-firmware 1.35
+ Reproducible: Yes
+ Tags: maverick kconfig needs-upstream-testing
+ Uname: Linux 2.6.34-5-generic i686
+ UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
+ dmi.bios.date: 11/25/2009
+ dmi.bios.vendor: Phoenix Technologies Ltd.
+ dmi.bios.version: 10MQ
+ dmi.board.name: NC20/NB20
+ dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
+ dmi.chassis.asset.tag: No Asset Tag
+ dmi.chassis.type: 10
+ dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
+ dmi.chassis.version: N/A
+ dmi.modalias:
dmi:bvnPhoenixTechnologiesLtd.:bvr10MQ:bd11/25/2009:svnSAMSUNGELECTRONICSCO.,LTD.:pnNC20/NB20:pvr04MQ:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNC20/NB20:rvr:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A:
+ dmi.product.name: NC20/NB20
+ dmi.product.version: 04MQ
+ dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
--
serve Xorg performance penalty due to [u]vesafb creating wrong PAT entries
https://bugs.launchpad.net/bugs/574733
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