User talk:Masterzorag

SPU Problems on Linux > 3.2, OpenCL related

As far as I know, I'm the only coding OpenCL on the Cell here, if someone want to test something be warned that due some spufs changes that ppc-kernel-devs are (maybe) trying to fix, latest 3.3/3.4/3.5 branches falls into 'possible circular locking dependency detected' and slowdown runtime.

• It's stable until 3.2 branch.
• Even disabling lock debugging it slowdowns without warnings, it happens even with OpenCL samples from IBM.

http://permalink.gmane.org/gmane.linux.ports.ppc.embedded/50547

Latest tested kernels:

• 3.2.55 works fine

# ./perlin
OpenCL took 22.496168 seconds to compute 1000 frames. Pixel Rate = 46.611316 Mpixels/sec, Frame Rate = 44.452015 frames/sec
Host code took 12.620616 seconds to compute 10 frames. Pixel Rate = 0.830844 Mpixels/sec, Frame Rate = 0.792354 frames/sec
OpenCL provided a 56.101182 speedup

• 3.3.3/3.4.6/3.5.3 falls into 'possible circular locking dependency detected' and slowdown runtime

Here the slowdown effect:

# ./perlin
OpenCL took 93.280273 seconds to compute 1000 frames. Pixel Rate = 11.241133 Mpixels/sec, Frame Rate = 10.720380 frames/sec
Host code took 12.948244 seconds to compute 10 frames. Pixel Rate = 0.809821 Mpixels/sec, Frame Rate = 0.772305 frames/sec
OpenCL provided a 13.881010 speedup

In this specific case time spent is 4x to do the same thing!
When program runs something is going weird, e.g. in my program I'm used to query an OpenCL builtin function to tell me how many available SPEs there are, and its reply 8.
Using spu_base.enum_shared=1 parameter it should reply 7, so seems that the issue is OpenCL related.

OtherOS region

OtherOS/OtherOS++ region is on HDD (ps3dd), we have new linux tools (ps3sed) and drivers.
To resize ps3da I've tried new ps3sed (manually), unsuccesfully: GameOS always detect corruption and redo its own things.
I've found a way to force resize on 4.46, no emer_init patch, no downgrading: GameOS respect standards.
I can now resize ps3da at arbitrary size.

Here I've forced ps3da to use 1216709344 sectors, this make me space for a ps3dd of about 16G. After that GameOS do it own things, I've resetted ps3da to its real geometry (1250263728) and booted a new petitboot.

root@ps3-linux:~# dmesg | grep ps3disk
[    3.220526] ps3disk_init:601: registered block device major 254
[    3.220549] ps3_system_bus_match:369: dev=6.0(sb_04), drv=6.0(ps3disk): match
[    3.220856] ps3disk sb_04: accessible region 0 start 0 size 1250263728
[    3.220952] ps3disk sb_04: accessible region 1 start 32 size 1212515008
[    3.221045] ps3disk sb_04: accessible region 2 start 1212515040 size 4194296
[    3.221051] ps3disk sb_04: ps3stor_probe_access:133: 3 accessible regions found
[    3.227341] ps3disk sb_04: ps3da is a SAMSUNG HM641JI (610480 MiB total, 610480 MiB region)
[    3.229035] ps3disk sb_04: ps3db is a SAMSUNG HM641JI (610480 MiB total, 592048 MiB region)
[    3.230008] ps3disk sb_04: ps3dc is a SAMSUNG HM641JI (610480 MiB total, 2047 MiB region)

root@ps3-linux:~# ps3sed print_region 3
   0                0       1250263728    1
   1               32       1212515008    8
   2       1212515040          4194296    8

root@ps3-linux:~# create_hdd_region.sh
INFO: device id 3
INFO: number of regions 3
INFO: total number of blocks 1250263728
INFO: last region start block 1212515040
INFO: last region number of blocks 4194296
INFO: new region start block 1216709344
INFO: new region number of blocks 33554376
INFO: new region id 3

root@ps3-linux:~# ps3sed print_region 3
   0                0       1250263728    1
   1               32       1212515008    8
   2       1212515040          4194296    8
   3       1216709344         33554376    1

root@ps3-linux:~# reboot && exit

Last number 1 is wrong, it says that last region has only one acl entry, we need to fix it at 8 entries:

• manually with ps3sed
• rebooting

Petitboot finally detect a new ps3dd device, the fourth region, of (33554376 * 512 =) 17179840512 bytes.
All of this with a 3.10.26 kernel and new tools: no vflash hacking involved, linux on vflash7 is deprecated.

Now hdd is the second device:

root@ps3-linux:~# ps3sed print_device
     flash    1      512           491008        7
     cdrom    3     2048       2147483647        1
      disk    2      512       1250263728        4

00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000010  00 00 00 00 0f ac e0 ff  00 00 00 00 de ad fa ce  |................|
00000020  00 00 00 00 00 00 00 03  00 00 00 00 00 00 00 02  |................|
00000030  00 00 00 00 00 00 00 20  00 00 00 00 48 45 82 c0  |....... ....HE..|
00000040  10 70 00 00 02 00 00 01  00 00 00 00 00 00 00 03  |.p..............|
00000050  10 70 00 00 01 00 00 01  00 00 00 00 00 00 00 03  |.p..............|
00000060  10 20 00 00 03 00 00 01  00 00 00 00 00 00 00 03  |. ..............|
00000070  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
000000c0  00 00 00 00 48 45 82 e0  00 00 00 00 00 3f ff f8  |....HE.......?..|
000000d0  10 70 00 00 02 00 00 01  00 00 00 00 00 00 00 03  |.p..............|
000000e0  10 70 00 00 01 00 00 01  00 00 00 00 00 00 00 03  |.p..............|
000000f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000150  00 00 00 00 48 85 82 e0  00 00 00 00 01 ff ff c8  |....H...........|
00000160  10 70 00 00 02 00 00 01  00 00 00 00 00 00 00 03  |.p..............|
00000170  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000400

ps3vuart-tools

We miss some stuff from old ps3sm-utils, looking to port: temperature, get_fan_policy and set_fan_policy to new ps3vuart-tools.
We need to enable some sort of fan control on petitboot now.

root@fedora_clone ~]# /home/ps3vuart-tools-2012-09-01/ps3sm/ps3sm get_fan_policy 0
0x01 0x01 0x48 0x00

[root@fedora_clone ~]# /home/ps3vuart-tools-2012-09-01/ps3sm/ps3sm temperature 0
01 00 00 00 3f 49 00 00

Updating the Real Time Clock with hwclock results in error:

Mar 31 18:09:18 fedora_clone kernel: os_area_queue_work_handler: Could not update FLASH ROM