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Author Topic: [40+ PH] SlushPool (slushpool.com); World's First Mining Pool  (Read 3852973 times)
doubletap1911
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October 19, 2015, 06:47:42 PM
 #21341

I received another reply today from Slush regarding the recent influx of invalid blocks.

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Thank you for pointing our attention to this situation. We understand your disappointment and are ready to provide you with more detailed explanation, please read below.

The primary reason for this behavior was recent malleability attack on Bitcoin network which caused the Bitcoind overload with transactions and directly affected the ability to propagate blocks into the network.
Not only our nodes were affected but many other nodes across entire BTC network as well.

Bitcoind 0.11.1 which was released 4 days ago contained bug fixes for these malleability attacks. We were testing it in the meantime in order to make sure we do will not cause any harm on our infrastructure and do not affect the
hash rate of our miners. We were stuck between a rock and a hard place these few days. But the unacceptable rise in number of invalid blocks forced us to act quickly. We would like to assure you that the new version of Bitcoind was successfully deployed on every node we use for our mining and blocks propagation. As a consequence we expect significant reduction in invalid blocks appearance in the next few days.

We hope you understand our struggle with the malleability attack and stay with us despite few bad days.
We are quick learners and are taking lessons from this experience which is going to have positive effect on your experience with our pool in the future

Martin
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CoinMap | Slush's Pool | TREZOR

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October 19, 2015, 08:25:05 PM
 #21342

I received another reply today from Slush regarding the recent influx of invalid blocks.

Quote
The primary reason for this behavior was recent malleability attack on Bitcoin network which caused the Bitcoind overload with transactions and directly affected the ability to propagate blocks into the network.
Not only our nodes were affected but many other nodes across entire BTC network as well.



Which is what I said.

Well, probably that in combination with bitcoinds that haven't been optimised to cope in this transaction spam environment which can cause massive mempool and cpu blowouts and subsequently very slow block changes/getblocktemplate calls.

In other words slush hadn't manage to optimise his bitcoinds to cope under the circumstances and ended up depending on the newer bitcoind version to fix it. While he says many other nodes were affected, there were pools that were not.

Primary developer/maintainer for cgminer and ckpool/ckproxy.
Pooled mine at kano.is, solo mine at solo.ckpool.org
-ck
Pyr3x
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October 19, 2015, 09:08:25 PM
 #21343

So now that he has applied this fix have things gotten any better?

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doubletap1911
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October 20, 2015, 12:30:56 AM
 #21344

So now that he has applied this fix have things gotten any better?

No invalid blocks today and our luck looks like it is turning around as well.
OneInchWonder
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October 20, 2015, 04:27:48 AM
 #21345

So far so good last invalid block was on 2015-10-18 08:55

get.uber.com/drive/?invite_code=brianp6308ue
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October 20, 2015, 10:28:56 AM
 #21346

So now that he has applied this fix have things gotten any better?

No invalid blocks today and our luck looks like it is turning around as well.

That is what I like to hear!

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Rikim4ru
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October 20, 2015, 10:43:26 AM
 #21347

Speaked too fast  Angry

https://blockchain.info/fr/block/0000000000000000014c463a40271798691071aba2c0d680403031bfdbcf0da3

3min42s late.....
WHAT KIND OF REFRESH RATE IS THIS.

What the hell!
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October 20, 2015, 11:04:50 AM
 #21348

That said.

I'm removing all my hashing from Slush.
Sorry, thought for sure you were one of the best pool!

But this is unacceptable.
Pay the fucking orphan, until then i'm out.

I won't be the stupid fuck that stay around in front of such a situation.

Slush at its current state is unreliable. Mine at your own risk? Dev won't share the risk with you that's for sure.
lemmyK
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October 20, 2015, 11:38:55 AM
 #21349

 Huh     o t i slush s pool..
Do something or go ...... Angry
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October 20, 2015, 11:51:50 AM
 #21350

That said.

I'm removing all my hashing from Slush.
Sorry, thought for sure you were one of the best pool!

But this is unacceptable.
Pay the fucking orphan, until then i'm out.

I won't be the stupid fuck that stay around in front of such a situation.

Slush at its current state is unreliable. Mine at your own risk? Dev won't share the risk with you that's for sure.

I agree. i have only 12 TH pointing but it does not help me with orphan block found frequently.
doubletap1911
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October 20, 2015, 06:03:28 PM
 #21351

I'm going to hold on a bit longer before moving my hashing power to another pool.  Kinda ride out this turn of luck we have suddenly seen on Slush.  It can't be a coincidence that the day them fix the invalid blocks (supposedly fixed) that the luck turns totally around as well.  Had to be more going wrong behind the scenes than they are letting on.  Don't ya think??
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October 20, 2015, 07:14:45 PM
 #21352

I'm going to hold on a bit longer before moving my hashing power to another pool.  Kinda ride out this turn of luck we have suddenly seen on Slush.  It can't be a coincidence that the day them fix the invalid blocks (supposedly fixed) that the luck turns totally around as well.  Had to be more going wrong behind the scenes than they are letting on.  Don't ya think??

So what are you saying he as ripping us off?

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doubletap1911
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October 20, 2015, 07:33:44 PM
 #21353

I'm going to hold on a bit longer before moving my hashing power to another pool.  Kinda ride out this turn of luck we have suddenly seen on Slush.  It can't be a coincidence that the day them fix the invalid blocks (supposedly fixed) that the luck turns totally around as well.  Had to be more going wrong behind the scenes than they are letting on.  Don't ya think??

So what are you saying he as ripping us off?
[/quote

No, I'm not saying that.  But I do find it rather odd that the pool was not only having way too many invalid blocks but also the pool luck was sinking like a rock.  They supposedly fix the invalid issue and at the same time the pools luck does a complete 180.  I'm by no means a mining expert so I don't know if the reason for invalid blocks was also tanking our luck however I do know Slush does not report luck correctly when it comes to invalid blocks.  The pool luck should have been much lower if he was.  

I think the question as to whether or not he has been ripping us off should be answered by someone with a lot more mining knowledge then I.

EDIT:  However, case in point while having issues with invalid blocks we were seeing 4-6 hour rounds.  Now with the with the fix the rounds have been much much shorter except for the 4 hour one today which happens to be in invalid block (379375).  As a rule of thumb I don't believe in coincidences.  Don't get me wrong, I'm complaining about the good luck we have had these last two days. 
doubletap1911
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October 20, 2015, 07:58:12 PM
 #21354

Now it appears that block 379780 which at the time of me writing this we have been mining for 48 minutes was already mined by ant pool 22 minutes ago. This is a horrible delay on Slush's part, he needs to get this crap figured out quickly.
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October 20, 2015, 07:58:24 PM
 #21355

Shouldn't a mod (-ck?) adjust this thread's title? The pool has been at ~32000TH/s for quite a while, now. 9000TH/s is old news.

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Rikim4ru
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October 21, 2015, 01:13:04 AM
 #21356

That's one way to shut me up.....


I guess I should work on my own Karma.


Moving my hash on the best day after 5 days of bad luck.... yeah that hurt.

Slush is really like an ex-girlfriend. The relation of Love/Hate is too close to be sustainable.
doubletap1911
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October 21, 2015, 04:30:56 AM
 #21357

That's one way to shut me up.....


I guess I should work on my own Karma.


Moving my hash on the best day after 5 days of bad luck.... yeah that hurt.

Slush is really like an ex-girlfriend. The relation of Love/Hate is too close to be sustainable.

I'm sure that hurt a bit but the 2 invalid blocks almost back to back shows Slush hasn't fixed anything yet.

Very disappointed, going to start looking for another pool to devote my hash's tomorrow.
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October 24, 2015, 01:18:58 AM
 #21358

Recent Orphaned Blocks Explanation 2 hours, 29 minutes
 
Orphaned blocks are natural part of Bitcoin network. Therefore, our recent orphan rate was probably - to a certain extent - a random noise. Since it has been higher than usual in the past few days, we have conducted a deep analysis of our internal infrastructure and made some adjustment.

Firstly, we have upgraded to Bitcoind 0.11.1 which definitely improved our mempool performance. However, the remaining problem was still in propagation of our blocks into the bitcoin network. Eventhough Slush Pool has been using the fast block relay network (http://bitcoinrelaynetwork.org/) for over a year now, thorough analysis of block propagation times showed that our connections to the fast block relay network were not working properly in the last few weeks.

This connectivity issue, which affected all 9 bitcoin nodes that we currently operate, has been fixed with the help from Matt Corallo - the author of the fast block relay network. In addition, we have updated the relay network client to the latest version.

Since we have not experienced any orphaned block (invalid in Slush Pool terminology) in the last 2 days (or more than 30 consecutive blocks) we suppose the issue has been fixed. Moreover the block propagation times are now being carefully monitored and >we believe such increased attention will lead to stable validation in the future.

Finally we believe, the fast block relay network provides a very robust solution to this issue for all miners and mining pools.

Ending note:

Not only exchanges and wallets have been affected by persisting spam attack. Since pools depend on quick propagation times among Bitcoin network nodes, they were affected as well.

A very good analysis regarding this topic has been written and published on following website by Organ Ofcorti: http://organofcorti.blogspot.cz/2015/10/october-18th-2015-mining-pool-statistics_21.htm

Although he covered a few selected pools in his analysis there are other big players who were not analyzed and had higher rate of orphaned blocks in the weeks before as well. Therefore, it is safe to guess that the whole network was and is being affected to much higher extent.

As to why the current spam attack impacts orphan rates, we would like to point attention of our technically skilled miners to following statistics as well: http://bitcoinrelaynetwork.org/stats.html
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October 24, 2015, 01:35:18 AM
 #21359



In 10 hours, 4 Ph more. Guess somebody pointed a few s3 to the pool.
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October 24, 2015, 02:48:44 AM
 #21360



In 10 hours, 4 Ph more. Guess somebody pointed a few s3 to the pool.

It seems like the more folks talk about leaving, the bigger the pool hash rate gets...

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No more empty Blocks!!  Stop supporting the SPV Mega Pools and try Kano CKPool or solo mining at Solo CKPool
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