Hey all,
On 17-06-16 16:28, TsvetanUsunov wrote:
четвъртък, 16 юни 2016 г., 6:38:03 UTC+3, Stefan Monnier написа:
I like to use A20 boards for little NAS-style servers, because of
their
very low power consumption.
But so far I'm not impressed w.r.t reliability (large part of the
problem being to get a reliable enough power adapter, it seems).
So, I'm looking for recommendations for an A20 board (with SATA)
where
the main issue is for it to be reliable (i.e. where I should be
able to
expect it to keep on running 24/7 for 5 to 10 years, like my old ASUS
WL-700gE).
Stefan
Hi,
I don't know what software you are using, but something seems broken
with Debian Jessie and we still can't figure out what is it.
A20-LIME (one memory chip) works fine with kernel 3.4 and mainline
kernel with both Jessie and Wheezy.
A20-LIME2 (two memory chips) crashes with Jessie on the stress tests
after 10-12 hours of work, but never crash with Wheezy with same
processor and memory setup no matter what kernel and uboot you use.
After lowering the DDR clock from 480 to 384Mhz Jessie stops crash on
the stress tests.
This is the weird embedded world where everything is mix of hardware
and software and you never know what to blame.
We temporary made LIME2 Jessie image with lower DDR clock until we
catch what introduces these problems with Jessie.
We have A20-LIME2 with Wheezy working 24/7 for more than two years and
never had it down.
This problem with Jessie was reported by customer few weeks ago, it's
hard to reproduce as it happens after hours of work.
We ran tests for weeks with different setting until we found that
lowering the DDR clock somehow cure this issue.
This doesn't have logic for now, but I'm sure when we get to the root
of the problem everything will make sense :)
I have quite a few lime2's that we can do some memory timing tests on. I
know ssvb would love that :)
We are running a 4.2.0-rc7 mainline custom compiled kernel (i can share
the config if needed) with jessie. Except some unidentified problem,
we've had 50 boards run continuously for months now. So I see both
issues. E.g. crashes that I cannot explain, even so bad they crash in
sync (e.g. 15 boards with the same problem at the exact same time) abut
other then that, months upon months without problems. While we are
trying to understand the crashing problem we have seen (maybe a little
bit tight timings combined with humidity, temperature and power
fluctuations?) they lime2's are very stable.
So as discussed on IRC, i'll be very happy to help running memory stress
tests on a big fleet of lime2's to help get data herein.
Tsvetan
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