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Author Topic: Antminer S15 with latest firmware consumes 1900W in lower temp env of 24C  (Read 150 times)
BogdanO
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April 22, 2019, 11:40:01 AM
Last edit: April 22, 2019, 12:01:40 PM by frodocooper
Merited by frodocooper (3), philipma1957 (2)
 #1

Hi guys,

I recently purchased a S15 and I ran several tests since, measuring the power consumption on wall. All seemed fine until 2 days ago when I installed the latest firmware Antminer-S15-user-201902251130-sig.tar.gz
In Finland the outside temp is cool enough to allow my S15 to report a "PCB temp" while running of 23-26-27-23C in the 4 rows and first column of the monitoring screen. The chips temp is in the 60-72C range for all tests.

Here's my test case:

1. I start the miner in a 20-21C room, allow it the time to boot. Initially all seems ok, hash rate 28TH and on wall consumption is 1600Wh.
2. 4 mins after this I see this logs in the kernel log (notice the low_bringup_pcb_temp_threshhold):

Code:
2019-04-22 10:03:48 driver-btm-soc.c:3774:check_system_work: Entering low environment handler...
2019-04-22 10:03:48 driver-btm-soc.c:3775:check_system_work: bring_up_pcb_temp = 25, low_bringup_pcb_temp_threshhold = 27, ideal rate = 28000, AVG_rate = 26838
2019-04-22 10:03:48 driver-btm-soc.c:7929:re_open_core: re_open_core start!
2019-04-22 10:03:50 dspic33ep16gs202.c:572:set_pic_heart_beat: Heartbeat failed on Chain[3], retry_count=1! read_back_data[1] = 0x0, read_back_data[2] = 0x0
2019-04-22 10:03:51 dspic33ep16gs202.c:572:set_pic_heart_beat: Heartbeat failed on Chain[2], retry_count=1! read_back_data[1] = 0xfe, read_back_data[2] = 0xfe

3. The miner consumption drops to some idle 100W for the next few minutes.
4. For the next 5 mins it reinitialises the hash board and finishes with:

Code:
2019-04-22 10:09:07 power.c:198:get_power_voltage_from_iic_value: iic_index for voltage[46] = 19.520524
2019-04-22 10:09:07 power.c:229:set_iic_power_by_iic_data: now setting voltage to : 19.553896
2019-04-22 10:09:08 power.c:198:get_power_voltage_from_iic_value: iic_index for voltage[47] = 19.503839
2019-04-22 10:09:08 power.c:229:set_iic_power_by_iic_data: now setting voltage to : 19.520524
2019-04-22 10:09:09 power.c:439:get_chain_voltage: chain[0], voltage is: 19.24
2019-04-22 10:09:10 power.c:439:get_chain_voltage: chain[1], voltage is: 19.23
2019-04-22 10:09:10 power.c:439:get_chain_voltage: chain[2], voltage is: 19.28
2019-04-22 10:09:11 power.c:439:get_chain_voltage: chain[3], voltage is: 19.24
2019-04-22 10:09:11 power.c:462:get_average_voltage: average  voltage is: 19.25
2019-04-22 10:09:11 driver-btm-soc.c:3794:check_system_work: low environment handler!
2019-04-22 10:09:11 driver-btm-soc.c:3795:check_system_work: low temperature reopen core and increase voltage 1 times!

5. At this point the miner is up again. Hash rate is up to 28TH again but the on wall consumption jumps to 1920W and stays on like that.
6. I bring the unit down and move it deeper inside the house (23-24C) where the temp PCB reads 36-40-38-36C. I power it up again.
7. This time power consumption stay at 1620W and there is no reinit of the hashboards and last lines in the kernel logs read:

Code:
2019-04-22 10:20:19 dspic33ep16gs202.c:65:volt_clamp: failed on Chain[3], b[0] = 254, b[2] = 254!
2019-04-22 10:20:21 dspic33ep16gs202.c:65:volt_clamp: failed on Chain[3], b[0] = 254, b[2] = 254!
2019-04-22 10:50:25 driver-btm-soc.c:3706:check_system_work: The avg rate is  28206 in 30 mins, PCB temperature between 36 ~ 62

Anyone shares the same experience? I didn't notice this on the old firmware. The new firmware mentions one thing that worries me: "Add low temperature protection function". Anyone knows where to pull the old firmware from (ie the December 2018 one)?

Cheers,
Bogdan
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BitMaxz
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April 22, 2019, 11:17:39 PM
Last edit: April 23, 2019, 10:20:04 AM by frodocooper
Merited by philipma1957 (1)
 #2

... Anyone shares the same experience? I didn't notice this on the old firmware. The new firmware mentions one thing that worries me: "Add low temperature protection function". Anyone knows where to pull the old firmware from (ie the December 2018 one)?

Maybe you are experiencing low temp protection this might be the reason why you are getting unstable hashrate for the first run did you try to run the miner for a longer time? Let it run first for 3 hours and let see if you will get stable hash rate and miner consumption.

Next time don't upgrade the firmware to the latest version if your miner is running fine without any software issue. Bitmain releases new 2019 firmware that mostly fixed all security issue(Disabled SSH access) if you upgrade the miner to 2019 firmware the miner SSH access is disabled where you can modify the config and bypass temp protection.

There is no other way for now to downgrade the firmware to lower version unless if you decide to run them with modified firmware.

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April 22, 2019, 11:29:46 PM
Last edit: April 23, 2019, 10:20:27 AM by frodocooper
 #3

Maybe you are experiencing low temp protection this might be the reason why you are getting unstable hashrate for the first run did you try to run the miner for a longer time? Let it run first for 3 hours and let see if you will get stable hash rate and miner consumption.

Next time don't upgrade the firmware to the latest version if your miner is running fine without any software issue. Bitmain releases new 2019 firmware that mostly fixed all security issue(Disabled SSH access) if you upgrade the miner to 2019 firmware the miner SSH access is disabled where you can modify the config and bypass temp protection.

There is no other way for now to downgrade the firmware to lower version unless if you decide to run them with modified firmware.

@ op  Never do a firmware upgrade  from bitmain  until  many people have done it.

op I tossed you some merits for letting us know about this.

I mine alt coins with https://simplemining.net...
I see BTC as the super highway and alt coins as taxis and trucks needed to move transactions.
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April 23, 2019, 01:09:42 AM
Last edit: April 23, 2019, 10:20:52 AM by frodocooper
 #4

Is there any modded firmware for the S15?

It is a shame this situation is extending to all their products, but i learned about it first with the S15 when someone announced defeating the "security feature". Now the question is, can the S15 be made to boot from an sd?

OP sadly made the mistake of upgrading the firmware, but Bitmain has removed him the chance to revert back.

BogdanO
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April 24, 2019, 11:33:56 AM
Merited by frodocooper (2)
 #5

Maybe you are experiencing low temp protection this might be the reason why you are getting unstable hashrate for the first run did you try to run the miner for a longer time? Let it run first for 3 hours and let see if you will get stable hash rate and miner consumption.

Next time don't upgrade the firmware to the latest version if your miner is running fine without any software issue. Bitmain releases new 2019 firmware that mostly fixed all security issue(Disabled SSH access) if you upgrade the miner to 2019 firmware the miner SSH access is disabled where you can modify the config and bypass temp protection.

Jus FYI, I received the unit 2 weeks ago, loaded with the 2018 Dec firmware in which the SSH was already disabled. I upgraded hoping for a fix to the root cause (the ssh vulnerability) and reactivation of the SSH. The hash rate is stable once a certain operational mode is achieved (ie cold or warm env operation.

Now... my main concern here is the increased power consumption to 1900W in colder env (20-24C 68-75F) (which is not that cold anyway and I guess many datacenters keep it even below this):

If I operate the miner in such "colder environment", hoping for a better performance (lower RPM fan) and efficient cooling, it ends up backfiring by jumping the electricity consumption by 300W (at the same hash rate), which at the current BTC price and electricity rate changes the whole economics quite a little. I bought this one miner because of improved efficiency and all that goes down the drain if it's too cold in the room?!? This cold protection seems to defeat the whole purpose of redesigning S15 as a more energy efficient miner.

I'll continue testing when I'll have more time and report back.

Thanks for all the comments.
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April 24, 2019, 05:45:54 PM
Last edit: April 25, 2019, 02:21:39 AM by frodocooper
 #6

Now... my main concern here is the increased power consumption to 1900W in colder env (20-24C 68-75F) (which is not that cold anyway and I guess many datacenters keep it even below this)...

The power consumption is too high it should be around 1600w +/-7% there is something wrong about the power supply. Have you tried to enable the low power mode at miner configuration tab? Let's see what changes in power consumption and hashrate?

I thought something that you should try and maybe you may able to reduce the current power consumption of the miner. Try this method below I know its for s9 but you can try it on s15 and maybe it may work.

- Solution for ANTMINER S9 FANS SPEED Up & Down every 20 Seconds.

Follow the guide above to appear the hidden menu where you can see the fan speed and frequency settings. Just play the settings both fan speed and frequency and let's see if it affects the temp and power consumption.

BogdanO
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April 24, 2019, 06:46:04 PM
Last edit: April 25, 2019, 02:22:09 AM by frodocooper
 #7

Just to be clear... my experience is that the S15 indeed consumes 1600W +/- 20W as long as the room temperature is high enough that the PCB temp reads above 27C. If not only then the consumption jumps to 1900W.
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April 24, 2019, 08:18:59 PM
Last edit: April 25, 2019, 02:23:17 AM by frodocooper
 #8

Just to be clear... my experience is that the S15 indeed consumes 1600W +/- 20W as long as the room temperature is high enough that the PCB temp reads above 27C. If not only then the consumption jumps to 1900W.

Yeah, that is why I suggested you to try the link above to see the hidden fan speed and frequency my thoughts is to try to change the fan speed to lower speed so that the PCB can be reach to 27c or above so that the low temperature protection not be able to activate.

That is the purpose of changing the fan speed to lower since you have colder environment this is the only solution that I know if the method above will work.

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April 29, 2019, 07:17:52 PM
Merited by frodocooper (2)
 #9

on the s15 specfication on bitmain it does mention that the ideal room temp for the s15 is 25 °C  > https://shop.bitmain.com/promote/antminer_s15_asic_bitcoin_miner/specification

so anything lower than that is not good.

from the kernel log you posted , it's pretty clear that the firmware has a count down of about 4 + 5 mins that checks the PCB temp , if it does not increase to where it wants it to be (36 ~ 62) it does this

Code:
low temperature reopen core and increase voltage 1 times!

the extra 300w it consumes afterwards is only the effect of voltage increasing which is the only way that miner has to increase the PCB temp ( higher voltage = increase in temps)  if you were to run it at even a colder room, then my guess is that it will increase the voltage twice and power on the wall will go pass 2000w.

so your best shot at this is to follow BitMaxz's advice and lower the fans' rpms to a degree where it does not spin fast enough to cool the miner below the ideal temp, remember you only have a few mins before the miner checks for temps, so you might need to provide some heat , maybe point the exhaust fan of another miner to the intake of this miner to warm it at start up ?

if you can't do that, then please allow more time, chances are the miner will do another temp check to drop the voltage after a certain time has passed, and if the voltage does drop then the power consumption will drop too.

and by the way, i wish i had a problem like yours , i think we all do  Grin , it is summer here and all i worry about is how to cool my gears down, just the exact opposite of what  you are tying to do.

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