Hello again. Some info about my rig:
Xubuntu Live (on 4 gb flash usb);
4 GB RAM;
HD 6950 unlocked @6970;
HD 6970
I build cgminer with --enable-cpumining & --enable-scrypt. When i start cgminer i receive error message:
sudo ./cgminer --scrypt -o http://ltc.kattare.com:9332 -u xxx -p xxx --shaders 1536 --intensity 19 --thread-concurrency 6144 -g 2
[2012-10-03 17:20:48] Started cgminer 2.7.6
[2012-10-03 17:20:49] Probing for an alive pool
[2012-10-03 17:20:49] Long-polling activated for http://ltc.kattare.com:9332/LP
[2012-10-03 17:20:49] Maximum buffer memory device 0 supports says 268435456, your scrypt setti
ngs come to 402653184
[2012-10-03 17:20:49] Error -61: clCreateBuffer (padbuffer8), decrease CT or increase LG
[2012-10-03 17:20:49] Failed to init GPU thread 0, disabling device 0
[2012-10-03 17:20:49] Restarting the GPU from the menu will not fix this.
[2012-10-03 17:20:49] Try restarting cgminer.
Press enter to continue:
[2012-10-03 17:21:11] Maximum buffer memory device 0 supports says 268435456, your scrypt setti
ngs come to 402653184
[2012-10-03 17:21:11] Error -61: clCreateBuffer (padbuffer8), decrease CT or increase LG
[2012-10-03 17:21:11] Failed to init GPU thread 1, disabling device 0
[2012-10-03 17:21:11] Maximum buffer memory device 1 supports says 268435456, your scrypt setti
ngs come to 402653184
[2012-10-03 17:21:11] Error -61: clCreateBuffer (padbuffer8), decrease CT or increase LG
[2012-10-03 17:21:11] Failed to init GPU thread 2, disabling device 1
[2012-10-03 17:21:11] Maximum buffer memory device 1 supports says 268435456, your scrypt setti
ngs come to 402653184
[2012-10-03 17:21:11] Error -61: clCreateBuffer (padbuffer8), decrease CT or increase LG
[2012-10-03 17:21:11] Failed to init GPU thread 3, disabling device 1
Before i export GPU_MAX_ALLOC_PERCENT=100 & GPU_USE_SYNC_OBJECTS=1. Maybe trouble with freespace on my usb flash drive.
Without --thread-concurrency option maximum hashrate about 340 on each gpu khash/s.
Try something like I used in a machine with two 6950s flashed to 70s.
cat ltc.sh
export GPU_USE_SYNC_OBJECTS=1
export GPU_MAX_ALLOC_PERCENT=100
export DISPLAY=:0
~/cgminer --scrypt --worksize 256,256 --thread-concurrency 7040,7040 --vectors 4,4 --gpu-threads 2 -I 18,18 -g 1 --auto-fan --auto-gpu --temp-target 81
And the card speeds.
cat vset.sh
DISPLAY=:0 aticonfig --od-enable --adapter=all
DISPLAY=:0 aticonfig --od-setclocks=770,1230 --adapter=0
DISPLAY=:0 aticonfig --od-setclocks=770,1230 --adapter=1
DISPLAY=:0 aticonfig --odgc --adapter=all
This gives me 410kh/s per card, leave out the --shaders like I do only one of them is needed so it is it or the --thread-concurrency option not both.