After a very good experience mining BTC with cgminer on p2pool for a few months I decided to try the scrypt version on one of my machines.
my experience with a 5850 is worse than what others report:
$ cgminer -o
http://my_local_p2pool:9327 -u x -p y --scrypt --shaders 1440 -I 10
is doing only about 83 Kh/s
GPU 0: 83.5 / 83.6 Mh/s | A:129 R:3 HW:0 U:27.80/m I:10
69.5 C F: 34% (1819 RPM) E: 900 MHz M: 1000 Mhz V: 1.118V A: 99% P: 0%
Last initialised: [2012-07-25 02:24:44]
Intensity: 10
Thread 0: 41.6 Mh/s Enabled ALIVE
Thread 1: 41.9 Mh/s Enabled ALIVE
any higher intensity does not really work. p2pool logs many messages like this:
2012-07-25 02:32:18.484973 Worker x submitted share with hash > target:
2012-07-25 02:32:18.485073 Hash: 5a417c48970ce4d87e9b4c082f855a656a90a0e8e0e50a3c62c0dc6273e03b97
2012-07-25 02:32:18.485106 Target: 6b8bd775c948180000000000000000000000000000000000000000000000
at intensity 13 the hash rate estimate of p2pool stays way below 100, but cgminer reports about 250Kh/s and no rejected shares !
GPU 0: 242.5 / 93.2 Mh/s | A:270 R:3 HW:0 U:34.04/m I:13
70.5 C F: 60% (3633 RPM) E: 900 MHz M: 1000 Mhz V: 1.118V A: 99% P: 0%
Last initialised: [2012-07-25 02:24:44]
Intensity: 13
Thread 0: 123.9 Mh/s Enabled ALIVE
Thread 1: 126.5 Mh/s Enabled ALIVE
my configuration:
Linux 3.1.10-1.9 x86_64 GNU/Linux
AMD SDK V2.7
fglrx driver 12.6
cgminer commit bff58c3bed937bd027e46907acd1eab7327e838b compiled from git
cgminer -D -T reports
[2012-07-25 02:11:38] Preferred vector width reported 4
[2012-07-25 02:11:38] Max work group size reported 256
[2012-07-25 02:11:38] Max mem alloc size is 134217728
[2012-07-25 02:11:38] Selecting scrypt kernel
[2012-07-25 02:11:38] GPU 0: selecting lookup gap of 2
[2012-07-25 02:11:38] GPU 0: selecting thread concurrency of 1440
[2012-07-25 02:11:38] Loaded binary image scrypt120724Cypressglg2tc1440w256l8.bin
[2012-07-25 02:11:38] Initialising kernel scrypt120724.cl with bitalign, 1 vectors and worksize 256
[2012-07-25 02:11:38] Creating scrypt buffer sized 134217728
[2012-07-25 02:11:38] initCl() finished. Found Cypress
any ideas what is wrong here ?