Slush Pool, performance dropped to half.

[globeadue]

I'm fairly new to all this, had been using slushes pool for about a week and half before they upgraded to Long polling and NTime rolling. After that my speed dropped in half. I'm using GUI Miner and running a xfx black 5830, from what I've read 220mh websites say 280 is avg for the chipset.

I signed up at bitcoinpool to see what my speed there would be and it's the same.

Does this sound like something screwy with my machine or is this normal performance?

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[tysat]

Are you overclocking at all?  Have you set flags in your miner?

[forsetifox]

How long did the speed stay low? Slush has been under attack several times within the last few weeks.

[globeadue]

Thanks for the replies,
No overclocking, no flags set in the guiminer additional flags box. I figure i would slowly work on tweaking it but haven't found that time yet.
Like i said it started around when i first saw the notice on slush saying the new features had been implemented.
My speed when slush is up has remained around 120, which is about half of what it was running at.
I made no changes to my system (might of been an automatic update that rolled through) but other than that no changes.

I thought mhash was directly related to hardware components, not network speed.

And as I said, i get the same speed when i tested on bitcoinpool which has the same features.

That said, I am of two thoughts.

1. Those features cause a mhash speed to drop.
2. something has happened to my system that's affecting the mining speed. but i have no clue how to diagnose, hence why i'm here posting.

[globeadue]

just and update, still have not identified cause, however a reboot restored the normal 220mhash rate,
at some point during the evening, web browsing /few rounds of league of legends it dropped to half again
closed all processes, restarted mining no change.
Rebooted again and 220 achieved again.

[digital]

If you watch YouTube (or other flash) videos with hardware acceleration turned on it will drop your mhash in half.

If you go to Youtube, right click on any video and choose settings.  Then on the Display tab (far left) uncheck enable hardware acceleration.

That will keep your rate from dropping when you watch the videos.

You can also up your rate by overclocking and setting flags as stated here:
https://en.bitcoin.it/wiki/Mining_hardware_comparison

Just find your card in the list and you'll see what everyone else used to get their speeds.

[globeadue]

thanks digital
i haven't noticed it this week, the last time i noticed it, i found a second instance of pocdlm(i know i spelt it wrong) running not sure how or why, my system didn't show in my guiminer so not sure what caused it.
but killing both, restored the 220mhash I expected.

Since the orphaned process wasn't being controlled by guiminor and didn't show up on the taskbar/systray I didn't notice it at first.